P1510

IDLE AIR CONTROL VALVE





Fault Symptom.
Low, high or hunting idling speed,
Idling speed sensitive to changes in engine load.

Conditions.
P1510
Short circuit to battery positive (B+).

P1513
Short circuit to ground.

P1514
Open circuit.

Diagnostic Help.
The idle air control valve can be activated with the ISAT scan tool.

- Select "ACTIVATE".
- Select "IAC VALVE".

The command activates the valve at a frequency of 0.5 Hz for 30 seconds.

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 idle air control valve's power supply

- Unplug the valve's connector.
- Connect the test lamp to the connector between:
^ pin 2 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 from the 3-pin connector to crimped connection J31. Continue with point 3.





2 Check the control module's outputs to the idle air control valve

- Connect the test lamp to:
^ Battery positive (B+) and pin 1 of the female connector.
- Connect an ISAT scan tool.
- Turn the ignition switch to the ON position.
- Select "ACTIVATE".
- Select "IAC VALVE".
The test lamp should flash at a frequency of 0.5 Hz for 30 seconds.

Test lamp flashing?

YES:
^ Change the idle air control 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:
^ Drive the car at varying engine loads and rpm for 5 minutes.
- Evaluation of 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.