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 idle air control (IAC) valve

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Checking 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 9-11ohms.

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 (engine control module (ECM) 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 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

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.

Select Continue.

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 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Verification








- Reconnect the connectors, reinstall components etc.
- Connect VCT 2000
- Ignition on.
Activate the idle air control (IAC) valve by clicking on the VCT 2000 symbol.





Does the idle air control (IAC) valve click?

Yes - FAULT FOUND

No - No Fault FoundFault-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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the terminal

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