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P0453





2ZR-FE ENGINE CONTROL: SFI SYSTEM: P0451-P0453: Evaporative Emission Control System Pressure Sensor Range / Performance


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.

HINT
Unit expressions

- [kPa-a (mmHg-a)] denotes absolute pressure.
- [kPa-g (mmHg-g)] denotes gauge pressure (relative pressure).
- On the Techstream, choose the unit of measurement according to the inspection procedure.

MONITOR DESCRIPTION





1. DTC P0451: Canister pressure sensor noise or fixed/flat

1. 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.

1. 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.

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

2. DTC P0452: Canister pressure sensor voltage low

2. If the canister pressure sensor voltage output [pressure] is below 0.45 V [42.1 kPa-a (315.7 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).

3. DTC P0453: Canister pressure sensor voltage high

3. If the canister pressure sensor voltage output [pressure] is 4.9 V [123.8 kPa-a (928.5 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 (Noise Monitor):





P0451 (Fixed/flat Monitor)

P0451 (Fixed/flat Monitor):





P0452 and P0453

P0452 and P0453:





TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister Pressure Sensor Noise

P0451: Canister Pressure Sensor Noise:





P0451: Canister Pressure Sensor Fixed/flat

P0451: Canister Pressure Sensor Fixed/flat:





P0452: Canister Pressure Sensor Low Voltage

P0452: Canister Pressure Sensor Low Voltage:





P0453: Canister Pressure Sensor High Voltage

P0453: Canister 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 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 ignition switch to ON (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 / EVAP / Vapor Pressure Pump.

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

Result:





C -- GO TO EVAP SYSTEM 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) Disconnect the ECM connector.





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

Result:





(c) 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 ECM connector.

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

Result:





(d) Reconnect the canister pump module connector.

(e) Reconnect the ECM connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM)

A -- REPLACE CHARCOAL CANISTER ASSEMBLY

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

(a) Disconnect the canister pump module connector.





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

Standard Voltage:





Standard Resistance:





Result:





(c) Reconnect the canister pump module connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM)
A -- Continue to next step.

5. REPLACE CHARCOAL CANISTER ASSEMBLY

(a) Replace the charcoal canister assembly Removal.

NOTICE:
When replacing the charcoal canister assembly, 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 fuel tank vent hose.





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

6. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM)

HINT
If the exhaust 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 the ECM Removal.

NEXT -- Continue to next step.

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Wait for at least 60 seconds.

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

HINT
If no pending DTCs are displayed on the Techstream, the repair has been successfully completed.

NEXT -- END
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