P0452

2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0450-P0453: Evaporative Emission Control System Pressure Sensor / Switch


DTC SUMMARY





HINT
The canister pressure sensor is built into the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System EVAP System.

MONITOR DESCRIPTION





1. DTC P0450: Canister pressure sensor abnormal voltage fluctuation

If the canister pressure sensor voltage output [pressure] rapidly fluctuates between less than 0.45 V [42.1 kPa-a (315.9 mmHg-a)] and more than 4.9 V [123.8 kPa-a (928.4 mmHg-a)], the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

2. DTC P0451: Canister pressure sensor abnormal voltage fluctuation or being constant

If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.

Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as the sensor being fixed/flat, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.

(Both the malfunctions are detected by 2 trip detection logic).

3. DTC P0452: Canister pressure sensor voltage low

If the canister pressure sensor voltage output [pressure] is below 0.45 V [42.1 kPa-a (315.9 mmHg-a)], the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

4. DTC P0453: Canister pressure sensor voltage high

If the canister pressure sensor voltage output [pressure] is 4.9 V [123.8 kPa-a (928.4 mmHg-a)] or more, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0451 (Noise Monitor):





P0451 (Stuck Monitor):





P0450, P0452 and P0453:





TYPICAL MALFUNCTION THRESHOLDS

P0450: Pressure sensor chattering





P0451: Noise monitor





P0451: Stuck monitor





P0452: Pressure sensor low voltage





P0453: Pressure sensor high voltage





WIRING DIAGRAM





INSPECTION PROCEDURE

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 tank cap.
- Do not disassemble the canister pump module.
- The Techstream is required to conduct the following diagnostic troubleshooting 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.

(f) Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump.

(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.

Result:





C -- GO TO EVAP SYSTEM

B -- CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
A -- Continue to next step.

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

(a) Turn the power switch off.

(b) Disconnect the A53 ECM connector.

(c) Measure the resistance between the PPMP terminal of the ECM connector and the body ground.

Result:





(d) Reconnect the ECM connector.

B -- REPLACE ECM
A -- Continue to next step.

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

(a) Disconnect the canister pump module connector.

(b) Disconnect the A53 ECM connector.

(c) Measure the resistance between the PPMP terminal of the ECM connector and the body ground.

Result:





(d) Reconnect the canister pump module connector.

(e) Reconnect the ECM connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE CANISTER ASSEMBLY

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

(a) Disconnect the canister pump module connector.

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

(c) Measure the voltage and resistance of the canister pump mpdule connector and body ground.

Standard::

w/o Active Stabilizer





w/ Active Stabilizer





Result:





(d) Reconnect the canister pump module connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE CANISTER ASSEMBLY

5. REPLACE CANISTER ASSEMBLY

(a) Replace the canister assembly Removal.

NOTICE:
When replacing the canister, check the canister pump module 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 hose from the canister to the fuel tank.





NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

6. REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT
If the tailpipe has been removed, go to the next step before reinstalling it.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

7. REPLACE ECM

(a) Replace ECM Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Put the engine in inspection mode Inspection Mode Procedure.

(b) Connect the Techstream to the DLC3.

(c) Turn the Techstream on.

(d) Wait for at least 60 seconds.

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

HINT
If no pending DTC is displayed on the Techstream, the repair has been successfully completed.

NEXT -- COMPLETED