Lexus NX: Inverter Coolant Pump Speed Signal (P314A-828)

DESCRIPTION

Refer to the description for DTC P0C73-776.

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The inverter water pump assembly sends the inverter water pump speed (measured value) signal to the hybrid vehicle control ECU. If the inverter water pump speed (measured value) signal is not sent to the hybrid vehicle control ECU when the power switch is on (READY), this DTC is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P314A-828	Inverter Coolant Pump Speed Signal	The inverter water pump speed signal is not sent to the hybrid vehicle control ECU when the power switch is turned on (READY). (1 trip detection logic)	Wire harness or connector Hybrid vehicle control ECU Inverter water pump assembly INV W/PMP fuse INV W/PMP NO. 2 fuse INV W/PMP relay	Comes on	Master Warning Light: Comes on

Related Data List

DTC No.	Data List
P314A-828	Inverter W/P Revolution (Inverter) W/P Run Control Duty Ready Signal

Related Active Test

DTC No.	Active Test
P314A-828	Activate the (Inverter) Water Pump

MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors the speed of the inverter water pump assembly. If the inverter water pump speed signal is not sent to the hybrid vehicle control ECU, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P314A (INF 828): Water pump malfunction
Required sensors/components	Inverter Water Pump Assembly
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	Immediately
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P314A (INF 828) is not detected

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0C73-776.

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CAUTION / NOTICE / HINT

NOTICE:

If DTC P0A78-284, 286, P0A7A-322, 324, P0A94-553 or 557 is output, replace the inverter with converter assembly after this inspection.

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

PROCEDURE

1.

CLEAR DTC

Click here

NEXT

2.	PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP)

NOTICE:

Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

HINT:

When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

Powertrain > Hybrid Control > Active Test

Tester Display
Activate the (Inverter) Water Pump

(d) Perform the "Activate the (Inverter) Water Pump" Active Test.

(e) Touch the inverter water pump assembly and check that it is operating (vibrating).

OK:

The inverter water pump is operating (vibrating).

(f) Turn the power switch off.

NG

GO TO STEP 9

OK

3.	CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY

OK

4.	CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

Click here

NG

CONNECT SECURELY

OK

5.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)

(a) Disconnect the A60 hybrid vehicle control ECU connector.

(b) Disconnect the A55 inverter water pump assembly connector.

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

*a

Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

*b

Front view of wire harness connector (to Inverter Water Pump Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A60-14 (NIWP) - A55-2 (NWP)	Power switch off	Below 1 Ω
A60-14 (NIWP) or A55-2 (NWP) -Body ground and other terminals	Power switch off	10 kΩ or higher

(d) Reconnect the A55 inverter water pump assembly connector.

(e) Reconnect the A60 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.	CHECK HYBRID VEHICLE CONTROL ECU

(a) Disconnect the A55 inverter water pump assembly connector.

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

(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition A60-14 (NIWP) - I115-6 (E1) Power switch on (IG) 11 to 14 V

*a Component with harness connected (Hybrid Vehicle Control ECU)

(d) Turn the power switch off.

(e) Reconnect the A55 inverter water pump assembly connector.

NG

REPLACE HYBRID VEHICLE CONTROL ECU

OK

7.

CLEAR DTC

Click here

NEXT

8.	PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP)

NOTICE:

Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

HINT:

When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

Powertrain > Hybrid Control > Active Test

Tester Display
Activate the (Inverter) Water Pump

(d) Perform the "Activate the (Inverter) Water Pump" Active Test.

(e) Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform. Item Content Terminal A60-14 (NIWP) - I115-6 (E1) Equipment Setting 5 V/DIV., 100 ms./DIV. Condition Power switch on (IG), during Active Test OK: The duration of wavelength A is 300 msec or less.

*a Component with harness connected (Hybrid Vehicle Control ECU)

(f) Turn the power switch off.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE INVERTER WATER PUMP ASSEMBLY

9.	CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

Click here

NG

CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

OK

10.	CHECK INSTALLATION CONDITION (INV W/PMP RELAY)

(a) Check installation condition of the INV W/PMP relay. OK: INV W/PMP relay is installed correctly.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Relay

NG

GO TO STEP 15

OK

11.	CHECK HARNESS AND CONNECTOR (IGCT RELAY - INV W/PMP RELAY)

(a) Remove the IGCT relay and INV W/PMP relay from the No. 1 engine room relay block.

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

*1	No. 1 Engine Room Relay Block
*2	INV W/PMP Relay
*3	IGCT Relay

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (IGCT relay) - 1 (INV W/PMP relay)	Power switch off	Below 1 Ω

NOTICE:

Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

*a	Example
*b	Shake Slightly
*c	Vibrate Slightly

(c) Install the IGCT relay and INV W/PMP relay.

NG

GO TO STEP 16

OK

12.	INSPECT RELAY (INV W/PMP)

(a) Remove the INV W/PMP relay from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Relay

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

*1 INV W/PMP Relay

(c) Install the INV W/PMP relay.

NG

GO TO STEP 18

OK

13.	CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)

(a) Disconnect the A55 inverter water pump assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A55-4 (+BWP) - Body ground	Power switch on (IG)	11 to 14 V

*a	Example
*b	Shake Slightly
*c	Vibrate Slightly

*a	Front view of wire harness connector (to Inverter Water Pump Assembly)

(c) Reconnect the A55 inverter water pump assembly connector.

NG

GO TO STEP 19

OK

14.	CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)

(a) Disconnect the A55 inverter water pump assembly connector.

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition A55-1 (GND) - Body ground Power switch off Below 1 Ω

*a Front view of wire harness connector (to Inverter Water Pump Assembly)

(c) Reconnect the A55 inverter water pump assembly connector.

OK

REPLACE INVERTER WATER PUMP ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	INSPECT RELAY (INV W/PMP)

(a) Remove the INV W/PMP relay from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Relay

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

*1 INV W/PMP Relay

(c) Install the INV W/PMP relay.

OK

CONNECT SECURELY (INV W/PMP RELAY)

NG

REPLACE RELAY (INV W/PMP)

16.	CHECK INSTALLATION CONDITION (INV W/PMP NO. 2 FUSE)

(a) Check installation condition of the INV W/PMP NO. 2 fuse. OK: INV W/PMP NO. 2 fuse is installed correctly.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP NO. 2 Fuse

NG

GO TO STEP 23

OK

17.	CHECK FUSE (INV W/PMP NO. 2 FUSE)

(a) Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP NO. 2 Fuse

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
INV W/PMP NO. 2 fuse	Always	Below 1 Ω

(c) Install the INV W/PMP NO. 2 fuse.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

GO TO STEP 24

18.	CHECK RELAY HOLDER TERMINAL (INV W/PMP RELAY)

(a) Check the terminals of the INV W/PMP relay holder.

OK:

The terminals of the INV W/PMP relay holder are not bent, loose or corroded.

OK

REPLACE RELAY (INV W/PMP)

NG

GO TO STEP 25

19.	CHECK INSTALLATION CONDITION (INV W/PMP FUSE)

(a) Check installation condition of the INV W/PMP fuse. OK: INV W/PMP fuse is installed correctly.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Fuse

NG

CONNECT SECURELY

OK

20.	INSPECT RELAY (INV W/PMP)

(a) Remove the INV W/PMP relay from the No. 1 engine room relay block.

*1 No. 1 engine room Relay Block *2 INV W/PMP Relay

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

*1 INV W/PMP Relay

(c) Install the INV W/PMP relay.

NG

GO TO STEP 26

OK

21.	CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK)

(a) Remove the INV W/PMP relay from the No. 1 engine room relay block.

(b) Disconnect the A55 inverter water pump assembly connector.

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

*1	No. 1 Engine Room Relay Block	*2	INV W/PMP relay
*a	Front view of wire harness connector (to Inverter Water Pump Assembly)	-	-

Standard Resistance:

Tester Connection	Condition	Specified Condition
A55-4 (+BWP) - 3 (INV W/PMP relay)	Power switch off	Below 1 Ω
A55-4 (+BWP) or 3 (INV W/PMP relay) - Body ground and other terminals	Power switch off	10 kΩ or higher

NOTICE:

Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

(d) Install the INV W/PMP relay.

(e) Reconnect the A55 inverter water pump assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

22.	CHECK FUSE (INV W/PMP FUSE)

(a) Remove the INV W/PMP fuse from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Fuse

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
INV W/PMP fuse	Always	Below 1 Ω

(c) Install the INV W/PMP fuse.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

GO TO STEP 28

23.	INSPECT RELAY (INV W/PMP)

(a) Remove the INV W/PMP relay from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP Relay

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

*1 INV W/PMP Relay

(c) Install the INV W/PMP relay.

OK

CONNECT SECURELY (INV W/PMP NO. 2 FUSE)

NG

GO TO STEP 29

24.	CHECK FUSE HOLDER TERMINAL (INV W/PMP NO. 2 FUSE)

(a) Check the terminals of the INV W/PMP NO. 2 fuse holder.

OK:

The terminals of the INV W/PMP NO. 2 fuse holder are not bent, loose or corroded.

OK

REPLACE FUSE (INV W/PMP NO. 2)

NG

GO TO STEP 30

25.	REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the terminals of the INV W/PMP relay holder.

NEXT

REPLACE RELAY (INV W/PMP)

26.	CHECK RELAY HOLDER TERMINAL (INV W/PMP NO. 2 RELAY)

(a) Check the terminals of the INV W/PMP relay holder.

OK:

The terminals of the INV W/PMP relay holder are not bent, loose or corroded.

NG

GO TO STEP 31

OK

27.	CHECK FUSE (INV W/PMP NO. 2 FUSE)

(a) Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP NO. 2 Fuse

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
INV W/PMP NO. 2 fuse	Always	Below 1 Ω

(c) Install the INV W/PMP NO. 2 fuse.

OK

REPLACE RELAY (INV W/PMP)

NG

GO TO STEP 33

28.	REPLACE INVERTER WATER PUMP ASSEMBLY

Click here

NEXT

REPLACE FUSE (INV W/PMP)

29.	REPLACE RELAY (INV W/PMP)

(a) Replace INV W/PMP relay.

NEXT

CONNECT SECURELY (INV W/PMP NO. 2 FUSE)

30.	REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the terminals of the INV W/PMP NO. 2 fuse holder.

NEXT

REPLACE FUSE (INV W/PMP NO. 2)

31.	CHECK FUSE (INV W/PMP NO. 2 FUSE)

(a) Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block.

*1 No. 1 Engine Room Relay Block *2 INV W/PMP NO. 2 Fuse

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
INV W/PMP NO. 2 fuse	Always	Below 1 Ω

(c) Install the INV W/PMP NO. 2 fuse.

NG

GO TO STEP 34

OK

32.	REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the terminals of the INV W/PMP relay holder.

NEXT

REPLACE RELAY (INV W/PMP)

33.	REPLACE RELAY (INV W/PMP)

(a) Replace INV W/PMP relay.

NEXT

REPLACE FUSE (INV W/PMP NO. 2)

34.	REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the terminals of the INV W/PMP relay holder.

NEXT

35.	REPLACE RELAY (INV W/PMP)

(a) Replace INV W/PMP relay.

NEXT

REPLACE FUSE (INV W/PMP NO. 2)

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