- EVAP monitoring (power switch off)
- Engine running
Lexus NX: Evaporative Emission Control System Pressure Sensor Range / Performance (P0451-P0453)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Evaporative Emission Control System Pressure Sensor Range / Performance (P0451-P0453)
DTC SUMMARY
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0451 | Evaporative Emission Control System Pressure Sensor Range / Performance | Sensor output voltage fluctuates frequently in a certain time period. |
| Comes on | DTC stored |
| P0452 | Evaporative Emission Control System Pressure Sensor / Switch Low Input | EVAP pressure sensor less than 42.11009 kPa(abs) [315.82568 mmHg(abs)] for 0.5 seconds. |
| Comes on | DTC stored |
| P0453 | Evaporative Emission Control System Pressure Sensor / Switch High Input | EVAP pressure sensor higher than 123.76147 kPa(abs) [928.21103 mmHg(abs)] for 0.5 seconds. |
| Comes on | DTC stored |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic |
|---|---|---|---|
| P0451 | Canister pressure sensor abnormal voltage fluctuation | | 2 trip |
| P0452 | Canister pressure sensor low input |
| 1 trip |
| P0453 | Canister pressure sensor high input |
| 1 trip |
HINT:
The canister pressure sensor is built into the canister pump module.
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System.
Click here .gif)
MONITOR DESCRIPTION
-
DTC P0451: Canister pressure sensor abnormal voltage fluctuation
If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores this DTC.
(Malfunctions is detected by 2 trip detection logic.)
-
DTC P0452: Canister pressure sensor voltage low
If the canister pressure sensor voltage output (pressure) is less than 0.45 V: 42.11009 kPa(abs) [315.82568 mmHg(abs)], the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC. (1 trip detection logic).
-
DTC P0453: Canister pressure sensor voltage high
If the canister pressure sensor voltage output (pressure) is higher than 4.9 V: 123.76147 kPa(abs) [928.21103 mmHg(abs)], the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (1 trip detection logic).
MONITOR STRATEGY
| Required Sensors/Components (Main) | Canister pump module |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 0.5 seconds: P0452 and P0453 Less than 15 seconds: P0451 |
| MIL Operation | Immediate: P0452 and P0453 2 driving cycles: P0451 |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
All| Monitor runs whenever the following DTCs are not stored | None |
| Atmospheric pressure (absolute pressure) | 70 kPa(abs) [525 mmHg(abs)] or higher, and less than 111 kPa(abs) [836 mmHg(abs)] |
| Auxiliary battery voltage | 10.5 V or higher |
| Intake air temperature | 4.4°C (40°F) or higher, and less than 50°C (122°F) |
| Canister pressure sensor malfunction (P0452, P0453) | Not detected |
| Either of the following conditions is met | A or B |
| A. Engine condition | Running |
| B. Time after key-off | 5, 7 or 9.5 hours |
| Either of the following conditions is met | (a) or (b) |
| (a) Power switch | ON |
| (b) ECM | Started by soak timer |
| Auxiliary battery voltage | 8 V or higher |
TYPICAL MALFUNCTION THRESHOLDS
P0451: Canister Pressure Sensor Noise Monitoring| Frequency that EVAP pressure change 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher | 10 times or more in 10 seconds |
| EVAP pressure | Less than 42.11009 kPa(abs) [315.82568 mmHg(abs)] |
| EVAP pressure | Higher than 123.76147 kPa(abs) [928.21103 mmHg(abs)] |
CONFIRMATION DRIVING PATTERN
NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 85% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature less than 35°C (95°F).
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air.
- Check that the intake air temperature is between 4.4 and 35°C (40 and 95°F).
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG) and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
- After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0451, P0452 or P0453.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CONFIRM DTC AND EVAP PRESSURE |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) [do not start the engine].
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes(f) Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Evaporative / Vapor Pressure Pump.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| Vapor Pressure Pump |
(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.
| Display (DTC Output) | Test Result | Suspected Trouble Area | Proceed to |
|---|---|---|---|
| P0451 | - | Canister pressure sensor | C |
| P0452 | Less than 42.11009 kPa(abs) [315.82568 mmHg(abs)] |
| A |
| P0453 | Higher than 123.76147 kPa(abs) [928.21103 mmHg(abs)] |
| B |
| B | .gif) | GO TO STEP 6 |
| C | | GO TO EVAP SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition | Suspected Trouble Area | Proceed to |
|---|---|---|---|---|
| A35-49 (PPMP) - Body ground | Always | Below 10 Ω |
| A |
| 10 kΩ or higher |
| B |
| B | | GO TO STEP 4 |
|
| 3. | CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
(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 |
|---|---|---|---|---|
| A35-49 (PPMP) - Body ground | Always | 10 kΩ or higher | Short in canister pressure sensor circuit | A |
| Below 10 Ω | Short in wire harness/connector (ECM - canister pressure sensor) | B |
| A | | GO TO STEP 7 |
| B | | GO TO STEP 8 |
| 4. | REPLACE ECM |
(a) Replace the ECM.
Click here
|
| 5. | CHECK WHETHER DTC OUTPUT RECURS (DTC P0451, P0452 OR P0453) |
(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).
(g) Turn the Techstream on.
(h) Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Powertrain > Engine and ECT > Utility| Tester Display |
|---|
| All Readiness |
(j) Input the DTC: P0451, P0452 or P0453.
(k) Check the DTC judgment result.
| Techstream Display | Description |
|---|---|
| NORMAL |
|
| ABNORMAL |
|
| INCOMPLETE |
|
| N/A |
|
| NEXT | | END |
| 6. | CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
| (a) Disconnect the canister pump module connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| b3-8 (SGND) - Body ground | Always | 100 Ω or less |
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| b3-6 (VCC) - Body ground | Power switch on (IG) | 4.5 to 5.5 V |
| b3-7 (VOUT) - Body ground | Power switch on (IG) | 4.5 to 5.5 V |
| Test Result | Suspected Trouble Area | Proceed to |
|---|---|---|
| Voltage and resistance within standard ranges | Open in canister pressure sensor circuit | A |
| Voltage and/or resistance outside standard ranges | Open in wire harness/connector (ECM - canister pressure sensor) | B |
| B | | GO TO STEP 8 |
|
| 7. | REPLACE CANISTER PUMP MODULE |
(a) Replace the canister pump module.
Click here
NOTICE:
- When replacing the canister pump module, check the canister pump module interior, canister interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the canister interior, replace canister and canister pump module together.
- Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace canister and the canister pump module together.
- Check for filter blockage in the canister filter. If the canister filter has blockage, replace the canister filter.
| *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 5 |
| 8. | REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) |
| NEXT | | GO TO STEP 5 |
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