Signal Too High. Permanent Fault

Signal too high. Permanent fault

EFI-223 Idle air control (IAC) valve opening, signal

Checking the signal cable








- Ignition off.
- Disconnect idle air control (IAC) valve.
- Ignition on.
Connect a voltmeter between ground and idle air control (IAC) valve connector terminal 3.









The voltmeter should read less than 1 V.

OK - Replacing component
Try a new idle air control (IAC) valve. Then continue with Verification.

Not OK - Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for a short-circuit

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Checking for a short-circuit








- Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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Replacing component
- Try a new idle air control (IAC) valve.





Continue - Verification

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Verification




Verification

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




- Ignition on.




- Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve.
- The idle air control (IAC) valve should click when it is activated.

Is the idle air control (IAC) valve working?

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - 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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Attempt New Test - Checking the signal cable

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