Signal Too Low. Permanent Fault

Signal too low. Permanent fault

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

Checking power cable








- Ignition off.
- Disconnect idle air control (IAC) valve.
- Ignition on.
Connect a voltmeter between idle air control (IAC) valve connector terminal 2 and ground.









The voltmeter should read battery voltage.

OK - Checking signal wiring resistance

Not OK - Check cable between main relay (2/32) terminal 3 and idle air control (IAC) valve terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Diagnostic trouble codes (DTCs) EFI-223 and EFI-245 will be stored if there is an open-circuit in the power cable. Then continue with Verification.
Checking for an open-circuit

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Checking for an open-circuit








- Check cable between main relay (2/32) terminal 3 and idle air control (IAC) valve terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Diagnostic trouble codes (DTCs) EFI-223 and EFI-245 will be stored if there is an open-circuit in the power cable.

Continue - Verification

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Checking signal wiring resistance








- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Idle air control (IAC) valve disconnected.
Connect an ohmmeter between idle air control (IAC) valve connector terminals 1 and 3.









The ohmmeter should read 20 - 40 kohms.

OK - Checking idle air control (IAC) valve

0 ohms - Check the cable between the idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to the cable between idle air control (IAC) valve terminal 1 and engine control module (ECM) #A25. Then continue with Verification.
Checking for a short-circuit

10-20 kohms - Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to ground 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 the cable between idle air control (IAC) valve terminal 1 and engine control module (ECM) #A25.

Continue - Verification

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Checking for a short-circuit








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

Continue - Verification

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Checking idle air control (IAC) valve








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








- Read off value.

The ohmmeter should read 9 - 14 ohms at +20 °C.

OK - Checking idle air control (IAC) valve

Not OK - Try a new idle air control (IAC) valve. Then continue with Verification.
Replacing component

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Checking idle air control (IAC) valve








- Ignition off.
- Idle air control (IAC) valve disconnected.
Connect an ohmmeter between idle air control (IAC) valve connector terminals 2 and 3.








- Read off value.

The ohmmeter should read 9 - 14 ohms at +20 °C.

OK - The cause of the diagnostic trouble code (DTC) has been loose connections in the idle air control (IAC) valve connector. Check connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Fault-tracing information

Not OK - Try a new idle air control (IAC) valve. Then continue with Verification.
Replacing component

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Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the idle air control (IAC) valve connector.
- Check connector for contact resistance and oxidation and remedy 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 power cable

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