P1425

EVAP CANISTER PURGE VALVE





Fault Symptoms.
Any other diagnostic trouble codes, such as adaptation, misfiring, etc.

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

P1425
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5-17 V.
^ Short circuit to battery negative (B-).

P1426
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5-17 V.
^ Open circuit.

Diagnostic Help.
The EVAP canister 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 s. The valve clicks on activation.

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 valve's power supply

- Unplug the purge valve's 2-pin connector.
- Turn the ignition switch to the ON position.
- Connect a test lamp to pin 1 and battery negative (B-).

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. Then continue with point 3.





2. Check the control module's output to the valve

- Connect a test lamp to battery positive (B+) and pin 2 of the female connector.
- Turn the ignition switch to the ON position.
- Connect the ISAT Scan Tool.
- 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 and continue with point 3.
NO: Check the lead in question and repair or replace it if necessary. Then 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 40°C (104°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.
- Evaluation of the driving cycle:
^ 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.