P1425

EVAP CANISTER PURGE VALVE





Fault Symptoms
CHECK ENGINE lamp (MIL) on.
Any other diagnostic trouble codes, such as adaptation, misfiring, etc.

Conditions.
P1410
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5 - 17 V.
^ Shorting to battery positive (B+).

P1425
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5 - 17 V.
^ Shorting to battery positive (B+).

P1426
^ Engine speed higher than 8 rpm.
^ Battery voltage 7.5 - 17 V.
^ Shorting to-battery positive (B+).

Diagnostic Help.
The purge valve can be activated with the ISAT scan tool.

- Select "ACTIVATE".
- Select "EVAP VALVE".

The valve is activated at a frequency of 0.5 Hz for 30 seconds. The valve clicks when activated.

Diagnosis of the EVAP canister purge valve can be activated with the ISAT scan tool.

- Select "INITIATE".
- Select "EVAP".

On completion of diagnosis the ISAT scan tool shows "READ".

Check The Wiring.
Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the wiring at several points and in different directions to ascertain whether the wiring harness, including any connectors, is causing the trouble. Observe the multimeter, ISAT scan tool or test lamp while doing this.





Diagnostic Procedure.
1 Check the purge valve's power supply

- Unplug the valve's 2-pin connector.
- Connect the test lamp to the connector between:
^ pin 1 and battery negative (B-).
- Turn the ignition switch to the ON position.
The test lamp should light up.

Did the test lamp light up?

YES:
^ Continue with point 2.
NO:
^ Repair or replace the lead between crimped connection J15 and pin 1 of the 2-pin connector. Continue with point 3.





2 Check the control module1s output to the valve

- Connect the test lamp to:
^ Battery positive (B+) and pin 2 of the female connector.
- Connect an ISAT scan tool.
- Turn the ignition switch to the ON position.
- Select "ACTIVATE".
- Select "EVAP VALVE".
The test lamp should flash at a frequency of 0.5 Hz for 30 seconds.

Test lamp flashing?

YES:
^ Change the valve. Continue with point 3.
NO:
^ Repair or replace the wiring. Continue with point 3.





3 Final check

- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Start the engine and run it at idling speed until the coolant temperature exceeds 60°C (140°F) or for at least one minute if this temperature is reached earlier. Drive the car at varying engine loads and rpm for 5 minutes.

Use the ISAT scan tool to activate diagnosis of the EVAP canister purge valve.

- Select "INITIATE".
- Select "EVAP".

When the ISAT scan tool shows "READY", check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?

YES:
^ Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO:
^ The steps taken to rectify the fault were correct.