Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the terminal








- Ignition off
- Idle air control (IAC) valve connector disconnected.
Check the idle air control (IAC) valve connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.









Were any faults found?

Yes - Verification

No - Checking the idle air control (IAC) valve

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Checking the idle air control (IAC) valve




- Idle air control (IAC) valve connector disconnected.
Connect an ohmmeter between idle air control (IAC) valve connector terminals 1 and 2.









The ohmmeter should read 9-11 ohms.

OK - Checking the power supply

Not OK - Defective idle air control (IAC) valve

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Checking the power supply




- Ignition on.
Connect a voltmeter between the idle air control (IAC) valve connector terminal 1 (control module side) and ground.









The voltmeter should read battery voltage for 2 seconds immediately after the ignition is switched on.

OK - Checking the signal cable

Not OK - Checking the signal cable

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Checking the signal cable
Check the cable between idle air control (IAC) valve connector terminal 2 and engine control module (ECM) connector terminal #64. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Try a new idle air control (IAC) valve if no fault is found during the above fault-tracing.

Other information:
- 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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Defective idle air control (IAC) valve
Try a new idle air control (IAC) valve according to Replacing the idle air control (IAC) valve Service and Repair.

Continue - Verification

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Checking the signal cable
Check the cable between idle air control (IAC) valve connector terminal 1 and system relay 2/14 terminal 3. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.













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 terminal

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