Signal Too High. Permanent Fault

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

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

If reading is incorrect:
^ Check cable between idle air control valve terminal 1 and engine control module (ECM) # A25 for a short-circuit to supply voltage.
^ Then 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" is heard from the idle air control valve when it is activated.
- Is the idle air control valve working?

If reading is OK:
^ Fault corrected

If reading is incorrect:
^ Prodeed to test step below.

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

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected

No:
^ Return to Checking Signal Cable section above.