Signal Too High. Permanent Fault

Checking the Signal Cable
- Ignition OFF.
- Disconnect idle air control (IAC) valve.
- Ignition ON.
- Connect a voltmeter between idle air control valve connector terminal 3 and ground.
- The voltmeter should read less than 1 Volt.

If reading is OK:
^ Try a new idle air control valve.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between idle air control valve terminal 3 and engine control module (ECM) # A11 for a short-circuit to supply voltage.
^ Proceed to: Verification section below.





Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition ON.
- Activate idle air control valve.
- A "clicking sound" can be heard from the idle air control valve when it is activated.
- Is the idle air control valve working?

Yes:
^ Fault corrected.

No:
^ Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected.

No:
^ Proceed to: Checking the Signal Cable section above.