Upper Limit
Upper 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 the air cleaner (ACL) and air intake
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 the air cleaner (ACL) and air intake
- Ignition off.
Check that the air cleaner (ACL), air intake and hoses and pipes between the air cleaner (ACL) and throttle body (TB) are not blocked. Check idle air control (IAC) valve terminals.
Is it OK?
OK - Checking idle air control (IAC) valve
Not OK - Remedy as necessary. Then continue with Verification.
Fault-tracing information
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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 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 the idle air control (IAC) valve control slide
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 the idle air control (IAC) valve control slide
- Ignition off.
- Remove idle air control (IAC) valve.
- Hold the valve by the connector, twist the valve rapidly but carefully back and forth. Listen for the sound of the slide switching.
Caution! Under no circumstances touch the slide with a screwdriver or other tool, as this may scratch and damage the slide.
The idle air control (IAC) valve control slide should switch.
OK - 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. Then continue with Verification.
Checking for contact resistance and oxidation
Not OK - Try a new idle air control (IAC) valve. Then continue with Verification.
Replacing component
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Checking for contact resistance and oxidation
- 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.
Select "Continue" when the fault has been repaired.
Continue - Verification
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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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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 - Diagnostic trouble code (DTC) information
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Diagnostic trouble code (DTC) 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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