Signal Missing. Permanent Fault

Signal missing. Permanent fault

EFI-245 Idle air control (IAC) valve closing, signal

Checking signal cable resistance to ground








- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Disconnect idle air control (IAC) valve.
Connect an ohmmeter between ground and idle air control (IAC) valve connector terminal 1.









The ohmmeter should read 10 - 20 kohms.

OK - Checking idle air control (IAC) valve
Checking idle air control (IAC) valve

Not OK - Checking control module connector

-------------------------------------------------

Checking control module connector












- Ignition off.
- Idle air control (IAC) valve disconnected.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Control module connected.
Connect an ohmmeter between ground and idle air control (IAC) valve connector terminal 1.









The ohmmeter should read 10 - 20 kohms.

OK - The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector. Then continue with Verification.
Fault-tracing information

Not OK - Check cable between idle air control (IAC) valve terminal 1 and engine control module (ECM) #A25 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for an open-circuit

-------------------------------------------------

Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

Continue - Verification

-------------------------------------------------

Checking for an open-circuit




- Check cable between idle air control (IAC) valve terminal 1 and engine control module (ECM) #A25 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

-------------------------------------------------

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.









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

Continue - Checking idle air control (IAC) valve

-------------------------------------------------

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.









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

OK - Fault-tracing information

Not OK - Replacing component

-------------------------------------------------

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

-------------------------------------------------

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





Continue - Verification

-------------------------------------------------

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

------------------------

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

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

------------------------

Attempt New Test - Checking signal cable resistance to ground

-------------------------------------------------