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Home >> Volvo >> 1998 >> C70 Convertible L5-2.4L Turbo VIN 56 B5254T >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> EFI Codes (Engine Control System) >> EFI-233 >> Adaptive Idle Air Trim. Lower Limit >> Lower Limit

Lower Limit






Lower limit:

EFI-233 Adaptive idle air trim

Checking throttle body (TB)




- Ignition off.
Check that seal on throttle body (TB) adjusting screw is not broken.





Is seal intact?

No - Checking link rod

Yes - Replace throttle body (TB). Then continue with Verification.
Replacing component

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Replacing component
- Replace throttle body (TB).

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking link rod




- Ignition off.
Check that the throttle spindle is in contact with the adjustment screw and that the throttle pulley is in contact with the idling stop.





Is the throttle mechanism OK?

Yes - Checking for air leakage

No - Check and adjust throttle spindle and throttle cable. Then continue with Verification.
Checking component

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Checking component
- Check and adjust throttle spindle and throttle cable.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking for air leakage




- Ignition off.
Check for air leakage according to Check for air leaks in the intake system Air Leaks In the Intake System, Checking.





Is there any leakage?

Yes - Remedy as necessary. Then continue with Verification.
Fault-tracing information

No - Checking idle air control (IAC) valve

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Fault-tracing information
- Remedy as necessary.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking idle air control (IAC) valve




- Ignition on.




- Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve.

A "clicking sound" should be heard from the valve.

OK - Checking idle air control (IAC) valve resistance

Not OK - Checking the idle air control (IAC) valve connector

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Checking the idle air control (IAC) valve connector












- Ignition off.
- Check idle air control (IAC) valve and engine control module (ECM) connectors for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reinstall engine control module (ECM) and idle air control (IAC) valve connectors.
- Ignition on.




- Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve.

A "clicking sound" should be heard from the valve.

OK - Checking idle air control (IAC) valve resistance

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

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





Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking idle air control (IAC) valve resistance








- Ignition off.
- Disconnect idle air control (IAC) valve.
Connect an ohmmeter between idle air control (IAC) valve terminals 1 and 3.









The ohmmeter should read 18 - 28 ohms at +20°C.

OK - Checking throttle

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

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





Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking throttle




- Ignition off.
- Remove fresh air intake between air cleaner (ACL) and throttle body (TB).
- Check that the throttle is undamaged, that it moves properly and that it has not come away from the throttle spindle.





Is the throttle OK?

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

Not OK - Replace throttle body (TB).
Replacing component

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Verification




Verification

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




- Ignition off.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
- Throttle position (TP) sensor and engine control module (ECM) connected.
- Ignition on.
- Go into the Diagnostic Test Mode (DTM) menu. Zero all adaptive functions but the flywheel.

OK - Verification, continued

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Verification, continued




- Volvo Scan Tool (ST) connect to VIDA station.
- Start the engine and run it until it reaches operating temperature, at least 85°C.
- Engine idling




- Select Volvo Scan Tool (ST) to read off the value of the idle air trim adaptation.
- When the idle air trim adaption value has stabilized. Rev the engine to approximately 2000 and idle it.
- Wait approximately 30 seconds and read off the value again. Repeat this until the value is stable.

The value should be between -5 and 15 kg/h.

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 throttle body (TB)

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