Fault Conditions

EVAP Purge Valve Circuit. Short to B+.







Fault symptoms
- CHECK ENGINE.
- Possible smell of petrol.

On-Board Diagnostics
Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- Engine running. Main relay voltage exceeding 10V. Output is active.

Fault criteria:
- Output voltage exceeding 2V. Condition fulfilled within 10 periods that must occur within 60 s. (Normally, it takes about 1 s to generate the trouble code.)

Dependents:
- None.

System reaction to a fault:
- None.

OK report:
- Enable criteria fulfilled. Fault criteria not fulfilled within 60 s.

Fault handling: Fault Handling III, Other Emission-Related Component & Function
- Type III.

Diagnostic help
Fault diagnosis concerns an electrical fault in the connecting leads or in the valve.
Functions in the diagnostic tool related to the fault:
- Activate valve output.

For more information, Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.

Proceed to Diagnostic Procedures Checking the Valve's Power Supply