Signal Too High. Permanent Fault

Signal too high. Permanent fault

Checking the idle air control (IAC) valve
Check that the resistance of the idle air control (IAC) valve is approximately 10 ohms between terminals #1 and #2.
Check the signal cable between idle air control (IAC) valve terminal #2 and engine control module (ECM) terminal #64. Check for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try a new idle air control (IAC) valve if no fault is found during the above fault-tracing.

Other information:
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- To replace the idle air control (IAC) valve, see Replacing the idle air control (IAC) valve Service and Repair.













Continue - Verification

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Verification








- Reconnect the connectors, reinstall components etc.
- Connect VCT2000
- Ignition on.
Click the VCT2000 symbol to activate the idle air control (IAC) valve.





Does the idle air control (IAC) valve click?

Yes - FAULT FOUND

No - No Fault Found Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the idle air control (IAC) valve

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