Lexus NX: EVAP System

RELATED DTCS

DTC No.	Monitoring Item	Link
P00FE	EVAP vent line blocked
P043E	Reference orifice clogged (built into canister pump module)
P043F	Reference orifice high-flow (built into canister pump module)
P0441	Purge VSV (Vacuum Switching Valve) stuck closed Purge VSV stuck open Purge flow
P0451	Canister pressure sensor (built into canister pump module) signal noise
P0452	Canister pressure sensor (built into canister pump module) voltage low
P0453	Canister pressure sensor (built into canister pump module) voltage high
P0455	EVAP gross leak
P0456	EVAP small leak
P2401	Leak detection pump stuck off (built into canister pump module)
P2402	Leak detection pump stuck on (built into canister pump module)
P2419	Vent valve stuck closed (built into canister pump module)
P2420	Vent valve stuck open (vent) (built into canister pump module)
P2610	Soak timer (built into ECM)

If any EVAP system DTCs are output, the malfunctioning area can be determined using the table below.

NOTICE:

If the reference pressure difference between the first and second checks is more than the specification, all DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) will be stored.

DESCRIPTION

*1	Purge VSV	*2	Fuel Vapor Feed Hose Assembly (EVAP Hose) (to Intake Manifold)
*3	Fuel Vapor Feed Hose Assembly (EVAP Hose) (from Canister)	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
*5	Canister	*6	Canister Filter
*7	Air Inlet Port	*8	Fuel Cap
*9	Fuel Tank	*10	Fuel Tank Vent Hose
*a	Location of EVAP (Evaporative Emission) System	*b	Purge Line

HINT:

The canister pressure sensor, leak detection pump and vent valve are built into the canister pump module.

*1	Canister Pump Module	*2	Intake Manifold
*3	Purge VSV	*4	Throttle Valve
*5	Canister	*6	Cut-off Valve
*7	Fuel Tank	*8	Air Cleaner
*9	ECM	*10	Canister Filter
*11	Soak Timer	*12	Roll-Over Valve
*13	Fuel Cap	*14	Fuel Tank Vent Hose
*a	EVAP System Circuit	-	-

NOTICE:

In the EVAP system of this vehicle, turning on the vent valve does not seal off the EVAP system. To check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from the atmospheric side of the canister.

While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened by the ECM and fuel vapors stored in the canister are purged to the intake manifold. The ECM changes the duty cycle ratio of the purge VSV to control purge flow volume.

The purge flow volume is also determined by the intake pressure. Atmospheric pressure is allowed into the canister through the vent valve to ensure that the purge flow is maintained when negative pressure (vacuum) is applied to the canister.

The following two monitors run to confirm appropriate EVAP system operation.

Key-off Monitor

This monitor checks for EVAP (evaporative emission) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the power switch is turned off. At least 5 hours are required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor more accurate.

The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the canister pump module and purge VSV based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the power switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the power switch is turned off, the monitor check starts 2.5 hours later.

Purge Flow Monitor

The purge flow monitor consists of the 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

*1	Canister	*2	to Intake Manifold
*3	ECM	*4	Soak Timer
*5	Purge VSV (On)	*6	Fuel Cap
*7	Canister Filter	*8	Fuel Tank
*9	Leak Detection Pump (Off)	*10	Canister Pressure Sensor
*11	Reference Orifice (0.02 inches)	*12	Vent Valve (Off)
*13	Canister Pump Module	-	-
*a	EVAP Purge Flow	-	-

Component	Operation
Canister	Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut-off valve	Located in fuel tank. Valve floats and closes when fuel tank is 100% full.
Purge VSV (Vacuum Switching Valve)	Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake manifold controlled by purge VSV duty cycle (current-carrying time). (Open: on, Close: off)
Roll-over valve	Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Soak timer	Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/-15 min) after power switch is turned off. This allows fuel to cool down, stabilizing EVAP pressure. When approximately 5 hours elapsed, ECM activates (refer to fig. 3).
Canister pump module	Consists of (a) to (d) below. Canister pump module cannot be disassembled.
(a) Vent valve	Vents and closes EVAP system. When ECM turns valve on, EVAP system is closed. When ECM turns valve off, EVAP system is vented. Negative pressure (vacuum) is created in EVAP system to check for EVAP leaks by closing purge VSV, turning on vent valve (closing it) and operating leak detection pump (refer to fig. 1).
(b) Canister pressure sensor	Indicates pressure as voltages. ECM supplies regulated 5 V to pressure sensor, and uses feedback from sensor to monitor EVAP system pressure (refer to fig. 2).
(c) Leak detection pump	Creates negative pressure (vacuum) in EVAP system for leak check.
(d) Reference orifice	Has opening with 0.02 inch diameter. Vacuum is produced through orifice by closing purge VSV, turning off vent valve and operating leak detection pump, to monitor reference pressure. Reference pressure is used when checking for small EVAP leaks.

*1	Canister	*2	Reference Orifice (0.02 Inch)
*3	Canister Pressure Sensor	-	-
*a	Canister Pump Module (fig. 1)	*b	Airflow
*c	Condition: Purge Flow	*d	Condition: Leak Check
*e	Vent Valve: off (vent)	*f	to Canister Filter (Atmosphere)
*g	Leak Detection Pump: off	*h	Vent Valve: on (closed)
*i	Leak Detection Pump: on	-	-

WIRING DIAGRAM

Refer to DTC P0451.

Click here

CAUTION / NOTICE / HINT

CONFIRMATION DRIVING PATTERN

HINT:

After a repair, check Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor Confirmation described below.

KEY-OFF MONITOR CONFIRMATION

(a) Preconditions

The monitor will not run unless:

(b) Monitor Conditions

(c) Monitor Status

PURGE FLOW MONITOR CONFIRMATION (P0441)

HINT:

Perform this monitor confirmation after the Key-Off Monitor Confirmation shows Complete.

(a) Preconditions

The monitor will not run unless:

(b) Monitor Conditions

(c) Monitor Status

MONITOR RESULT

Refer to detailed information in Checking Monitor Status.

Click here

P0456: Evaporative System / SMALL LEAK

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$C9	Multiply by 0.001	kPa	Test value for small leak

P0455: Evaporative System / GROSS LEAK

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$CA	Multiply by 0.001	kPa	Test value for gross leak

P2401: Evaporative System / VACUUM PMP OFF

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$CB	Multiply by 0.001	kPa	Test value for leak detection pump stuck off

P2402: Evaporative System / VACUUM PMP ON

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$CD	Multiply by 0.001	kPa	Test value for leak detection pump stuck on

P2420: Evaporative System / VENT VALVE OFF

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$CE	Multiply by 0.001	kPa	Test value for vent valve stuck off

P2419: Evaporative System / VENT VALVE ON

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$CF	Multiply by 0.001	kPa	Test value for vent valve stuck on

P043E: Evaporative System / ORIFICE CLOGGED

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$D0	Multiply by 0.001	kPa	Test value for reference orifice low flow

P043F: Evaporative System / ORIFICE HI-FLW

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$D1	Multiply by 0.001	kPa	Test value for reference orifice high flow

P0441: Evaporative System / PURGE VSV CLOSED

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$D4	Multiply by 0.001	kPa	Test value for purge VSV stuck closed

P0441: Evaporative System / PURGE VSV OPENED

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$D5	Multiply by 0.001	kPa	Test value for purge VSV stuck open

P0441: Evaporative System / PURGE FLOW

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$D7	Multiply by 0.001	kPa	Test value for purge flow insufficient

PROCEDURE

1.	CONFIRM DTC

(a) Turn the power switch off and wait for 10 seconds.

(b) Turn the power switch on (IG).

(c) Turn the power switch off and wait for 10 seconds.

(d) Connect the Techstream to the DLC3.

(e) Turn the power switch on (IG).

(f) Turn the Techstream on.

(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(h) Confirm the DTCs and freeze frame data.

If any EVAP system DTCs are stored, the malfunctioning area can be determined using the table below.

NOTICE:

If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.

NEXT

2.	PERFORM EVAP SYSTEM CHECK (AUTOMATIC MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Click here

(e) Turn the power switch off and wait for at least 30 seconds.

(f) Turn the power switch on (IG) and turn the Techstream on.

(g) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

Powertrain > Engine and ECT > Utility

Tester Display
Evaporative System Check

(h) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

HINT:

If no pending DTCs are displayed, perform the Confirmation Driving Pattern. After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal.

NEXT

3.	PERFORM EVAP SYSTEM CHECK (MANUAL MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Click here

Powertrain > Engine > Clear DTCs

(e) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Manual Mode.

Powertrain > Engine and ECT > Utility

Tester Display
Evaporative System Check

NEXT

4.	PERFORM EVAP SYSTEM CHECK (STEP 1/6)

(a) Check the EVAP pressure in step 1/6.

DTC*1	Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure	Not yet determined	A
P0451	EVAP pressure fluctuates by +/-0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher	Canister pressure sensor signal noise	B
(P0452 or P0453)*2	EVAP pressure is below 42.11009 kPa(abs) [315.82568 mmHg(abs)] or 123.76147 kPa(abs) [928.21103 mmHg(abs)] or higher EVAP pressure deviates +/-10 kPa(gauge) [75 mmHg(gauge)] from actual atmosphere pressure *3	Canister pressure sensor or its circuit has malfunction	C

HINT:

*3: Canister pressure sensor standard output range is 70 to 111 kPa(abs) [525 to 836 mmHg(abs)]. This varies by weather.

B

GO TO STEP 51

C

GO TO STEP 52

A

5.	PERFORM EVAP SYSTEM CHECK (STEP 1/6 TO 2/6)

(a) Check the EVAP pressure in steps 1/6 and 2/6.

DTC*	Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure during step 1/6. Then decreases to reference pressure	Not yet determined	A
P2402	Small difference between EVAP pressures during steps 1/6 and 2/6	Leak detection pump stuck ON	B

HINT:

The first reference pressure is the value determined in step 2/6.

B

GO TO STEP 48

A

6.	PERFORM EVAP SYSTEM CHECK (STEP 2/6)

HINT:

Make a note of the pressures checked in inspection items (A) and (B) below.

(a) Check the EVAP pressure 4 seconds after the leak detection pump is activated*1 (A).

*1: The leak detection pump begins to operate as step 1/6 finishes and step 2/6 starts.

(b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure (B).

DTC*2.	Result	Suspected Trouble Area	Proceed to
-	EVAP pressure in inspection item (B) is between -4.85 kPa(gauge) and -1.057 kPa(gauge) [-36.38 mmHg(gauge) and -7.929 mmHg(gauge)]	Not yet determined	A
P043F and P2401	EVAP pressure in inspection item (B) is -1.057 kPa(gauge) [-7.929 mmHg(gauge)] or higher	Reference orifice high-flow Leak detection pump stuck off	B
P043E	EVAP pressure in inspection item (B) is less than -4.85 kPa(gauge) [-36.38 mmHg(gauge)]	Reference orifice clogged	C
P2419	EVAP pressure in inspection item (A) is higher than -0.25 kPa(gauge) [-1.875 mmHg(gauge)]	Vent valve stuck closed Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit)	D

B

GO TO STEP 39

C

GO TO STEP 51

D

GO TO STEP 40

A

7.	PERFORM EVAP SYSTEM CHECK (STEP 2/6 TO 3/6)

(a) Check the EVAP pressure in step 3/6.

DTC*	Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher within 10 seconds of proceeding from step 2/6 to step 3/6	Not yet determined	A
P2420	No variation in EVAP pressure even after proceeding from step 2/6 to step 3/6	Vent valve stuck open (vent) Canister (charcoal filter inside canister) clogged	B

B

GO TO STEP 35

A

8.	PERFORM EVAP SYSTEM CHECK (STEP 3/6)

(a) Check the EVAP pressure in step 3/6.

DTC*	Result	Suspected Trouble Area	Proceed to
-	Other than below	Not yet determined	A
P00FE	Within 14.7 seconds after step 3/6 begins, the EVAP pressure becomes less than -2.5 kPa(gauge) (-0.363 psi(gauge)) HINT: Vary with first reference pressure.	Fuel tank vent hose clogged Fuel tank assembly (roll-over valve, cut-off valve) clogged Canister (charcoal filter inside canister) clogged	B

HINT:

A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel tank, it takes up to 15 minutes.

B

GO TO STEP 32

A

9.	PERFORM EVAP SYSTEM CHECK (STEP 4/6)

(a) Check the EVAP pressure in step 4/6.

DTC*1	Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher within 10 seconds of proceeding from step 3/6 to step 4/6	Not yet determined	A
P0441*2	EVAP pressure increases by 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher within 10 seconds of proceeding from step 3/6 to step 4/6	Purge VSV Purge VSV circuit Problems in EVAP hose between purge VSV and intake manifold Problems in EVAP hose between canister and purge VSV ECM	B
P0441	Variation in EVAP pressure is less than 0.3 kPa(gauge) [2.25 mmHg(gauge)] for 10 seconds, after proceeding from step 3/6 to step 4/6	Purge VSV stuck closed Purge VSV circuit Canister (charcoal filter inside canister) clogged Problems in EVAP hose between purge VSV and intake manifold Problems in EVAP hose between canister and purge VSV ECM	C

B

GO TO STEP 12

C

GO TO STEP 20

A

10.	PERFORM EVAP SYSTEM CHECK (STEP 5/6)

(a) Check the EVAP pressure in step 5/6.

(b) Compare the EVAP pressure in step 3/6 and the second reference pressure (step 5/6).

DTC*	Result	Suspected Trouble Area	Proceed to
-	EVAP pressure from step 3/6 lower than second reference pressure (step 5/6)	Not yet determined (no leakage from EVAP system)	A
P0441 and P0455	EVAP pressure from step 3/6 higher than [second reference pressure (step 5/6) x 0.2]	Purge VSV stuck open EVAP gross leak	B
P0456	EVAP pressure from step 3/6 higher than second reference pressure (step 5/6)	EVAP small leak

B

GO TO STEP 20

A

11.	REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS

(a) Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.

NEXT

GO TO STEP 24

12.	INSPECT EVAP HOSE (PURGE VSV - CANISTER)

(a) Check for blockages in the EVAP purge line between the purge VSV and canister.

OK:

No blockages in the EVAP purge line between the purge VSV and canister.

NG

GO TO STEP 25

OK

13.	CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD)

(a) Disconnect the fuel vapor feed hose assembly (connected to the intake manifold) from the purge VSV.

*1 Purge VSV *2 Fuel Vapor Feed Hose Assembly (to Intake Manifold)

(b) Put the engine in inspection mode (maintenance mode).

Click here

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(c) Start the engine.

(d) Use your finger to confirm that the hose has suction.

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between purge VSV and intake manifold normal Purge VSV Purge VSV power source Wire harness or connector between purge VSV and ECM	A
No suction	Intake manifold port EVAP hose between purge VSV and intake manifold	B

B

GO TO STEP 17

A

14.	INSPECT PURGE VSV

(a) Remove the purge VSV.

(b) Apply auxiliary battery voltage to the terminals of the purge VSV.

*a Port E *b Port F *c Air

(c) Confirm that air flows from port E to port F.

Test Result	Condition	Suspected Trouble Area	Proceed to
Air flows	Auxiliary battery voltage is applied to purge VSV terminals	Purge VSV normal Purge VSV power source Wire harness or connector between purge VSV and ECM	A
No air flow	Auxiliary battery voltage is applied to purge VSV terminals	Purge VSV	B

B

GO TO STEP 31

A

15.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

(a) Disconnect the purge VSV connector.

*a Front view of wire harness connector (to Purge VSV)

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
C32-1 - Body ground	Power switch on (IG)	11 to 14 V	Purge VSV power source normal Wire harness or connector between purge VSV and ECM	A
		Other than result above	Wire harness or connectors between purge VSV and auxiliary battery	B

B

GO TO STEP 47

A

16.	CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

(a) Disconnect the ECM connector.

(b) Disconnect the purge VSV connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C32-2 - C48-68 (PRG)	Always	Below 1 Ω
C32-2 or C48-68 (PRG) - Body ground	Always	10 kΩ or higher

OK

GO TO STEP 46

NG

GO TO STEP 47

17.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Stop the engine.

(b) Disconnect the EVAP hose from the intake manifold.

(c) Put the engine in inspection mode (maintenance mode).

Click here

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(d) Start the engine.

(e) Use your finger to confirm that the port of the intake manifold has suction.

Tester Connection	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between intake manifold and purge VSV	A
No suction	Intake manifold	B

B

GO TO STEP 19

A

18.	REPAIR OR REPLACE EVAP PURGE LINE (INTAKE MANIFOLD - PURGE VSV)

NEXT

GO TO STEP 24

19.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold.

Click here

NEXT

GO TO STEP 24

20.	PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

Powertrain > Engine and ECT > Active Test

Tester Display
Activate the VSV for Evap Control

(b) Disconnect the fuel vapor feed hose assembly (connected to the canister) from the purge VSV.

*1 Purge VSV *2 Fuel Vapor Feed Hose Assembly (to Canister)

(c) Put the engine in inspection mode (maintenance mode).

Click here

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(d) Start the engine.

(e) Using the Techstream, turn off the purge VSV (Activate the VSV for Evap Control: OFF).

(f) Use your finger to confirm that the purge VSV has no suction.

(g) Using the Techstream, turn on the purge VSV (Activate the VSV for Evap Control: ON).

(h) Use your finger to confirm that the purge VSV has suction.

Test Result	Suspected Trouble Area	Proceed to
No suction when purge VSV turned off, and suction applied when turned on	Blockage in the purge line is considered (based on result of step 9): Problems with EVAP hose between canister and purge VSV Canister (charcoal filter inside canister) clogged ECM	A
	Leakage is considered (based on result of step 10): Fuel cap Leakage from EVAP line, fuel tank, or canister	B
Suction applied when purge VSV turned off	Purge VSV stuck open	C
No suction when purge VSV turned on	Purge VSV stuck closed Problems with EVAP hose between purge VSV and intake manifold	D

B

GO TO STEP 26

C

GO TO STEP 30

D

GO TO STEP 13

A

21.	INSPECT EVAP HOSE (PURGE VSV - CANISTER)

(a) Check for blockages in the EVAP purge line between the purge VSV and canister.

OK:

No blockages in the EVAP purge line between the purge VSV and canister.

NG

GO TO STEP 25

OK

22.	INSPECT CANISTER (CHARCOAL FILTER INSIDE CANISTER)

(a) Check for filter blockage in the canister.

Click here

OK:

No blockages in the canister.

OK

GO TO STEP 46

NG

23.	REPLACE CANISTER

(a) Replace the canister.

Click here

*1	Fuel Tank Vent Hose	*2	Air Inlet Port
*3	Vent Hose	*4	Fuel Tank
*5	Canister Pump Module	*6	Canister
*7	Canister Filter	-	-
*a	Inspection Area (check for disconnection and/or cracks)	-	-

NEXT

24.	PERFORM EVAP SYSTEM CHECK (AUTOMATIC MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

(f) Turn the power switch on (IG) and turn the Techstream on.

(g) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

Powertrain > Engine and ECT > Utility

Tester Display
Evaporative System Check

(h) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

HINT:

If no pending DTCs are found, the repair has been successfully completed.

NEXT

END

25.	REPAIR OR REPLACE EVAP PURGE LINE (PURGE VSV - CANISTER)

NEXT

GO TO STEP 24

26.	CHECK FUEL CAP

(a) Check that the fuel cap is correctly installed and confirm that the fuel cap meets OEM specifications.

(b) Tighten the fuel cap firmly (only one click sound could be heard).

HINT:

If an EVAP tester is available, check the fuel cap using the tester.

(1) Remove the fuel cap and install it onto a fuel cap adapter.

(2) Connect an EVAP tester pump hose to the adapter, and pressurize the cap to 3.2 to 3.7 kPa(gauge) [24 to 27.75 mmHg(gauge)] using an EVAP tester pump.

(3) Seal the adapter and wait for 2 minutes.

(4) Check the pressure. If the pressure is 2 kPa(gauge) [15 mmHg(gauge)] or higher, the fuel cap is normal.

Test Result	Suspected Trouble Area	Proceed to
Fuel cap correctly installed	-	A
Fuel cap loose	Fuel cap improperly installed Defective fuel cap Fuel cap does not meet OEM specifications	B
Defective fuel cap	-
No fuel cap	-	C

B

GO TO STEP 28

C

GO TO STEP 29

A

27.	LOCATE EVAP LEAK PART

(a) Disconnect the vent hose.

(b) Connect the EVAP pressure tester tool to the canister pump module with the adapter.

*1	Canister Pump Module	*2	Adapter
*3	EVAP Pressure Tester Tool	-	-

(c) Pressurize the EVAP system to 3.2 to 3.7 kPa(gauge) [24 to 28 mmHg(gauge)].

(d) Apply soapy water to the piping and connecting parts of the EVAP system.

(e) Look for areas where bubbles appear. This indicates the leak point.

(f) Repair or replace the leak point.

HINT:

Disconnect the hose between the canister and fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

NEXT

GO TO STEP 24

28.	CORRECTLY REINSTALL OR REPLACE FUEL CAP

NEXT

GO TO STEP 24

29.	REPLACE FUEL CAP

HINT:

When installing the fuel cap, tighten it firmly (only one click sound could be heard).

NEXT

GO TO STEP 24

30.	INSPECT PURGE VSV

(a) Turn the power switch off.

(b) Disconnect the purge VSV connector.

*1 Purge VSV *2 Fuel Vapor Feed Hose Assembly (to Canister)

(c) Disconnect the fuel vapor feed hose assembly (connected to the canister) from the purge VSV.

(d) Put the engine in inspection mode (maintenance mode).

Click here

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(e) Start the engine.

(f) Use your finger to confirm that the purge VSV has no suction.

Test Result	Suspected Trouble Area	Proceed to
No suction	Wire harness or connector between purge VSV and ECM ECM	A
Suction applied	Purge VSV	B

A

GO TO STEP 16

B

31.	REPLACE PURGE VSV

(a) Replace the purge VSV.

Click here

NEXT

GO TO STEP 24

32.	INSPECT FUEL TANK VENT HOSE SUB-ASSEMBLY

(a) Check for blockages in the fuel tank vent hose between the fuel tank assembly and canister.

OK:

No blockages in the fuel tank vent hose between the fuel tank assembly and canister

NG

REPAIR OR REPLACE FUEL TANK VENT HOSE SUB-ASSEMBLY

OK

33.	INSPECT CANISTER (CHARCOAL FILTER INSIDE CANISTER)

(a) Check for filter blockage in the canister.

Click here

OK:

No blockages in the canister.

NG

GO TO STEP 23

OK

34.	REPLACE FUEL TANK ASSEMBLY

(a) Replace the fuel tank assembly.

Click here

NEXT

GO TO STEP 24

35.	INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE)

*a	Front view of wire harness connector (to Canister Pump Module)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Turn the power switch on (IG).

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
b3-5 (VLVB) - Body ground	Power switch on (IG)	11 to 14 V	Wire harness or connector between vent valve and ECM Vent valve Canister (charcoal filter inside canister) clogged ECM	A
		Below 3 V	Power source wire harness of vent valve	B

B

GO TO STEP 47

A

36.	INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

*a	Component without harness connected (Canister Pump Module)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Apply the auxiliary battery voltage to terminals VLVB and VGND of the canister pump module.

(d) Touch the canister pump module to confirm the vent valve operation.

Condition	Tester Result	Suspected Trouble Area	Proceed to
Apply auxiliary battery voltage to terminals VLVB and VGND	Operating	Wire harness or connector between vent valve and ECM Canister (charcoal filter inside canister) clogged ECM	A
	Not operating	Vent valve	B

B

GO TO STEP 51

A

37.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Disconnect the ECM connector.

(d) Measure the resistance according to the value(s) in the table below.

Tester Connection	Condition	Test Result	Suspected Trouble Area	Proceed to
b3-1 (VGND) - A35-7 (VPMP)	Always	Below 1 Ω	Canister (charcoal filter inside canister) clogged ECM	A
		10 kΩ or higher	Wire harness or connector between ECM and canister pump module	B

B

GO TO STEP 47

A

38.	INSPECT CANISTER (CHARCOAL FILTER INSIDE CANISTER)

(a) Check for filter blockage in the canister.

Click here

OK:

No blockages in the canister.

OK

GO TO STEP 46

NG

GO TO STEP 23

39.	PERFORM EVAP SYSTEM CHECK (STEP 3/6)

(a) Check the EVAP pressure in step 3/6.

DTC*	Result	Suspected Trouble Area	Proceed to
P043F	EVAP pressure less than [reference pressure] measured in step 2/6	Reference orifice high-flow	A
P2401	EVAP pressure almost same as [reference pressure] measured in step 2/6	Leak detection pump stuck off	B

*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedure above.

HINT:

The first reference pressure is the value determined in step 2/6.

A

GO TO STEP 51

B

GO TO STEP 48

40.	INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

*a	Component without harness connected (Canister Pump Module)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Apply the auxiliary battery voltage to terminals VLVB and VGND of the canister pump module.

(d) Touch the canister pump module to confirm the vent valve operation.

Condition	Tester Result	Suspected Trouble Area	Proceed to
Apply auxiliary battery voltage to terminals VLVB and VGND	Operating	Wire harness or connector between vent valve and ECM Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit) ECM	A
	Not operating	Vent valve	B

B

GO TO STEP 51

A

41.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Turn the power switch off.

(b) Disconnect the ECM connector.

(c) Disconnect the canister pump module connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A35-7 (VPMP) - b3-1 (VGND)	Always	Below 1 Ω
A35-7 (VPMP) or b3-1 (VGND) - Body ground	Always	10 kΩ or higher

Result	Suspected Trouble Area	Proceed to
OK	Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit) ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

B

GO TO STEP 47

A

42.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND)

(a) Disconnect the canister pump module connector.

(b) Measure the resistance according to the value(s) in the table below.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
b3-4 (MGND) - Body ground	Always	Below 1 Ω	Canister pump module Wire harness or connector between canister pump module and ECM ECM	A
		10 kΩ or higher	Wire harness or connector between canister pump module and body ground	B

B

GO TO STEP 47

A

43.	CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

(a) Disconnect the canister pump module connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
A35-19 (MPMP) - b3-3 (MTRB)	Always	Below 1 Ω	Canister pump module ECM	A
		10 kΩ or higher	Wire harness or connector between ECM and canister pump module	B

B

GO TO STEP 47

A

44.	REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module.

Click here

*1	Fuel Tank Vent Hose	*2	Air Inlet Port
*3	Vent Hose	*4	Fuel Tank
*5	Canister Pump Module	*6	Canister
*7	Canister Filter	-	-
*a	Inspection Area (check for disconnection and/or cracks)	-	-

NEXT

45.	PERFORM EVAP SYSTEM CHECK (AUTOMATIC MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

(f) Turn the power switch on (IG) and turn the Techstream on.

(g) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

Powertrain > Engine and ECT > Utility

Tester Display
Evaporative System Check

(h) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

Result	Proceed to
EVAP system DTCs are output	A
DTCs are not output (Pending DTC is not output)	B

B

END

A

46.	REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

GO TO STEP 24

47.	REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT

GO TO STEP 24

48.	CHECK TERMINAL VOLTAGE (CANISTER PUMP MODULE)

*a	Front view of wire harness connector (to Canister Pump Module)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Turn the power switch on (IG).

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Condition	Test Result	Suspected Trouble Area	Proceed to
b3-3 (MTRB) - Body ground	Power switch on (IG)	9 to 14 V	Wire harness or connector between leak detection pump and body ground Leak detection pump	A
		Below 3 V	Wire harness or connector between leak detection pump and ECM ECM	B

B

GO TO STEP 50

A

49.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND)

(a) Turn the power switch off.

(b) Disconnect the canister pump module connector.

(c) Measure the resistance according to the value(s) in the table below.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
b3-4 (MGND) - Body ground	Always	Below 1 Ω	Leak detection pump	A
		10 kΩ or higher	Wire harness or connector between canister pump module and body ground	B

A

GO TO STEP 51

B

GO TO STEP 47

50.	CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

(a) Turn the power switch off.

(b) Disconnect the ECM connector.

(c) Disconnect the canister pump module connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A35-19 (MPMP) - b3-3 (MTRB)	Always	Below 1 Ω
A35-19 (MPMP) or b3-3 (MTRB) - Body ground	Always	10 kΩ or higher

Result	Suspected Trouble Area	Proceed to
OK	ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

A

GO TO STEP 46

B

GO TO STEP 47

51.	REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module.

Click here

*1	Fuel Tank Vent Hose	*2	Air Inlet Port
*3	Vent Hose	*4	Fuel Tank
*5	Canister Pump Module	*6	Canister
*7	Canister Filter	-	-
*a	Inspection Area (check for disconnection and/or cracks)	-	-

NEXT

GO TO STEP 24

52.	INSPECT CANISTER PUMP MODULE (CANISTER PRESSURE SENSOR CIRCUIT)

(a) Check the canister pressure sensor circuit, referring to DTC P0451 canister pressure sensor circuit inspection procedure.

Click here

NEXT

GO TO STEP 24

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