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Wiring diagrams Section: Testing & Diagnostics

Engine Control Module (ECM) - Diagnostic Trouble Code (DTC) Index - B5254T2

Engine Control Module (ECM) - Diagnostic Trouble Code (DTC) Index - B6294T

Heated Oxygen Sensor (HO2S) and Engine Control Module (ECM) - Diagnostic Information: Overview
Heated Oxygen Sensor (HO2S) and Engine Control Module (ECM) - Diagnostic Information: Diagnosis
Heated Oxygen Sensor (HO2S) and Engine Control Module (ECM) - Diagnostic Information: Other

All sections

Engine Control Module (ECM) Diagnostic Trouble Codes - 2 of 13: Other Volvo XC90 I

Testing & Diagnostics 4 illustrations ~13212 words

SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

see SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

VERIFICATION

HINT: After carrying out the repair, check that the fault has been remedied.

Scheme 95

Scheme 95: VERIFICATION

Scheme 96

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S12271880742012060500000)

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.

FAULTY SIGNAL

see FAULTY SIGNAL

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S00486407702012060500000)

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.

SIGNAL MISSING

see SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S04406552072012060500000)

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.

SIGNAL TOO HIGH

see SIGNAL TOO HIGH

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S31208649352012060500000)

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.

SIGNAL TOO LOW

see SIGNAL TOO LOW

CHECKING THE STATUS

Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check whether the fault is permanent or intermittent. Read off the diagnostic trouble code (DTC) fault status when the diagnostic status is "Completed". HINT: In some cases several functions of the component will be diagnosed. The affects the amount of time taken to run the diagnostic. The fault is permanent if the fault status is "Fault found". If the fault status is "No fault found" the fault is intermittent and not presently active.

Continue Refer to «CHECKING THE COMPONENTS AND WIRING»(ref-476756-S08874157092012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S10856402372012060500000)

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.

see SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S28759571952012060500000)

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.

see SIGNAL TOO HIGH

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S05040700562012060500000)

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.

see SIGNAL TOO LOW

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to run at idle speed for 10 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S10115936542012060500000)

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.

see FAULTY SIGNAL

CHECKING THE CONNECTOR

Check power cable terminal #1 in the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.

Check ground lead terminal #2 in the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Remedy as necessary.

Other information

For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S11033082512012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to run at idle speed for 10 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S32704122962012060500000)

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.

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off.
Reconnect connectors, reinstall components etc.
Ignition on.
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S24409916262012060500000)

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.

Ignition off
Check the injector connector. Check for contact resistance and oxidation
Reinstall the components, reconnect the connectors etc.
Ignition on
Activate the injector. A "click" should be heard when the injector is activated. If the injector is now OK, the fault was caused by poor contact in the connector. Other information For B5xx4T, see «INJECTOR/PULSE DAMPER, REPLACEMENT»(ref-476751-S12739566552012060500000) For B6xx4T, see «INJECTOR / PULSATION DAMPER, REPLACING»(ref-476751-S42918859582012060500000) . For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000) For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) . see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

Is the injector working?

YES OKAY: Troubleshooting has been completed.
NO Refer to «CHECKING COMPONENTS AND WIRING»(ref-476756-S04778126202012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect connectors, reinstall components etc.
Ignition on
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S17676321562012060500000)

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.

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off.
Reconnect connectors, reinstall components etc.
Ignition on.
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S04781298522012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect connectors, reinstall components etc.
Ignition on
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S39455876362012060500000)

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.

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off.
Reconnect connectors, reinstall components etc.
Ignition on.
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S15255871452012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect connectors, reinstall components etc.
Ignition on
Activate the relevant injector. A "click" should be heard when the injector is activated.

Is the injector working?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S21202330402012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for at least 1 minute
Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S39486334712012060500000)

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.

see SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S20824407032012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S19658823792012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S42705395082012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine and run it until the engine coolant temperature exceeds 60 °C
Switch off the engine and allow it to cool (below 40 °C)
Test drive the car on the road (engine speed (RPM) above 2000 RPM, never idling) for at least 15 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S40084148262012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S30367676732012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S15246053962012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Increase the engine speed to 2500 RPM until the diagnostic is "Complete". Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S41038042772012060500000)

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.

Check the connector for the rear heated oxygen sensor (HO2S). Check for contact resistance and oxidation. Remedy if necessary.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Other information

For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S00491043432012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for at least 1 minute
Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S06659857542012060500000)

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.

see FAULTY SIGNAL

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

CHECKING CABLES

Check the cable between engine control module (ECM) #B45 (#B55) and central electronic module #14B (#A34) for a short-circuit to ground according to SHORT-CIRCUIT TO GROUND, PERMANENT FAULTS and for open-circuits according to OPEN-CIRCUIT, PERMANENT FAULTS

Remedy as necessary

Other information

Connecting the breakout box/accessing the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) .
To connect the central electronic module breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476703-S35775802292012060500000) .
For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .

Continue Refer to «VERIFICATION»(ref-476756-S41905579162012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reinstall the connectors, components etc.
Ignition on. Read off the fuel pump input signal for the central electronic module (CEM) from the engine control module (ECM). Start the engine and check that the fuel pump (FP) input signal to the central electronic module (CEM) changes status.

Does the status of the input signal change?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S13769226592012060500000)

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.

Check the cable between engine control module (ECM) #B45 (#B55) and central electronic module #14B (#A34) for an intermittent short-circuit to supply voltage according to SHORT-CIRCUIT TO SUPPLY VOLTAGE, INTERMITTENT FAULTS .

Other information

Connecting the breakout box/accessing the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) .
To connect the central electronic module breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476703-S35775802292012060500000) .
For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .

Continue Refer to «INFORMATION»(ref-476756-S14725689012012060500000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Check the cable between engine control module (ECM) #B45 (#B55) and central electronic module #14B (#A34) for a short-circuit to supply voltage according to SHORT-CIRCUIT TO SUPPLY VOLTAGE. PERMANENT FAULTS .

Remedy as necessary

Other information

Connecting the breakout box/accessing the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) .
To connect the central electronic module breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476703-S35775802292012060500000) .
For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .

Continue Refer to «VERIFICATION»(ref-476756-S09765240532012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reinstall the connectors, components etc.
Ignition on. Read off the fuel pump input signal for the central electronic module (CEM) from the engine control module (ECM). Start the engine and check that the fuel pump (FP) input signal to the central electronic module (CEM) changes status.

Does the status of the input signal change?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S11898485782012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for at least 1 minute
Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S33179450622012060500000)

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.

see SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car and perform a TRIP schedule: «VERIFYING REPAIRS»(ref-494828-S19905032792012081600000)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the dynamic for the front heated oxygen sensor (HO2S). The value should be higher than 1.0.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S37778842912012060500000)

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.

see SIGNAL TOO LOW

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Allow the engine to cool (to below 40 °C). Then start the engine
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S18228385562012060500000)

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.

see SIGNAL MISSING

see SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S36031750292012060500000)

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.

see SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S00712838812012060500000)

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.

see SIGNAL TOO HIGH

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S40997096752012060500000)

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.

see SIGNAL TOO LOW

INTERNAL FAULT

see INTERNAL FAULT

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S29833181342012060500000)

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.

see SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S19245328612012060500000)

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.

SIGNAL TOO HIGH / SIGNAL MISSING / FAULTY SIGNAL

see SIGNAL TOO HIGH / SIGNAL MISSING / FAULTY SIGNAL

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S23147390592012060500000)

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.

see SIGNAL TOO HIGH

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S40258632262012060500000)

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.

see SIGNAL TOO LOW

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S16016139432012060500000)

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.

see SIGNAL MISSING

CHECKING THE FUEL INJECTION SYSTEM FOR LEAKAGE

Check the fuel injection system for leakage
Remedy as necessary. If no faults are found during the checks and the fault recurs as permanent, replace both heated oxygen sensors (HO2S). Other information: For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000) For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .

Continue Refer to «VERIFICATION»(ref-476756-S00561213852012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for 10 minutes
Read off diagnostic trouble codes (DTCs). The fault has been remedied if status of the diagnostic trouble code (DTC) is intermittent.

Is the status of the diagnostic trouble code (DTC) intermittent?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S32635472912012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S25326041612012060500000)

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.

see SIGNAL MISSING

CHECKING COMPONENTS

Check the exhaust system for air leakage.

Check the cable for a short-circuit to supply voltage or ground.

Check between

The cable between engine control module (ECM) terminal #A42 (#A42) and heated oxygen sensor (HO2S) terminal #5
The cable for pump current between engine control module (ECM) terminal #A24 (#A24) and heated oxygen sensor (HO2S) terminal #6
The cable for calibration current between engine control module (ECM) terminal #A28 (#A28) and heated oxygen sensor (HO2S) terminal #2.

Check the cable between engine control module (ECM) terminal #A41 (#A41) and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.

HINT: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensors (HO2S), as the diagnostic trouble code (DTC) can also be stored by a damaged front/rear heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S22210346382012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S21781089342012060500000)

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.

see FAULTY SIGNAL

Check the connectors for the heated oxygen sensors (HO2S). Check for contact resistance. Check for oxidation.

Check the exhaust system for air leakage.

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S37200133012012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S39083396692012060500000)

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.

see SIGNAL MISSING

Check the exhaust system for air leakage

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S07142778582012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S18751462582012060500000)

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.

SIGNAL TOO HIGH / SIGNAL TOO LOW

see SIGNAL TOO HIGH / SIGNAL TOO LOW

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S36052238382012060500000)

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.

see FAULTY SIGNAL

Check the connector for the rear heated oxygen sensor (HO2S) (bank 2). Check for contact resistance and oxidation. Remedy if necessary.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Other information

For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S39992026432012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for at least 1 minute
Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S01149335982012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Start the engine. Allow the engine to idle for at least 1 minute
Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S34538094382012060500000)

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.

see SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car and perform a TRIP schedule: «VERIFYING REPAIRS»(ref-494828-S19905032792012081600000)
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the dynamic for the front heated oxygen sensor (HO2S). The value should be higher than 1.0.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S15440353472012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Allow the engine to cool (to below 40 °C). Then start the engine
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S23459413012012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S20526636022012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S09230681942012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S28853777442012060500000)

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.

see INTERNAL FAULT

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S22290643942012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S40938365592012060500000)

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.

see SIGNAL TOO HIGH / SIGNAL MISSING / FAULTY SIGNAL

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S05822278032012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S25909150602012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S06852265052012060500000)

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.

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S02654973452012060500000)

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.

Check the exhaust system for air leakage.

Check the cable for a short-circuit to supply voltage or ground.

Check between

The cable between engine control module (ECM) terminal #A44 (#A44) and heated oxygen sensor (HO2S) terminal #5
The cable for pump current between engine control module (ECM) terminal #A25 (#A25) and heated oxygen sensor (HO2S) terminal #6
The cable for calibration current between engine control module (ECM) terminal #A69 (#B9) and heated oxygen sensor (HO2S) terminal #2.

Check the cable between engine control module (ECM) terminal #A43 (#A43) and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S04017854762012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S23991537172012060500000)

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.

Check the connectors for the heated oxygen sensors (HO2S). Check for contact resistance. Check for oxidation.

Check the exhaust system for air leakage.

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S12131035632012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S15319396482012060500000)

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.

Check the exhaust system for air leakage.

Remedy as necessary.

Other information

see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
For B5xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S23777230272012060500000)
For B6xx4T, see «HEATED OXYGEN SENSOR (HO2S), REPLACING»(ref-476768-S05984728352012060500000) .
see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

Continue Refer to «VERIFICATION»(ref-476756-S22842299102012060500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 10 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read out the deviation between the front and rear heated oxygen sensor (HO2S). Check that the value is between -0.03 and +0.03.

Is the value OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S16490537792012060500000)

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.

see SIGNAL TOO HIGH / SIGNAL TOO LOW

HINT: After carrying out the repair, check that the fault has been remedied.

Ignition off
Reconnect the connectors, reinstall components etc.
Test drive the car at an even speed (engine speed (RPM) above 2000 RPM) for at least 5 minutes
Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
Connect VCT2000 (or appropriate scan tool) to the data link connector (DLC) without switching off the engine. NOTE: If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated. Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list. Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.

Is the function OK?

YES VERIFIED: Troubleshooting has been completed.
NO Refer to «INFORMATION»(ref-476756-S25342438242012060500000)

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.

CHECKING FUEL INJECTION SYSTEM

Check intake system for air leakage according to CHECK FOR AIR LEAKS IN THE INTAKE SYSTEM .

HINT: Air leakage in the intake system can occur through the canister purge (CP) valve, the secondary air solenoid valve and power brake booster.

Check the exhaust system for leakage according to CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM .

Check fuel and residual pressure according to CHECKING FUEL AND RESIDUAL PRESSURES .

Check that the oil level is between the minimum and maximum markings

Check engine dilution by, reading off the short-term fuel trim with the engine running, plug the crankcase ventilation and read off the short-term fuel trim again, the value should be more or less unchanged

Remedy as necessary.

Was a fault detected?

YES Refer to «VERIFICATION»(ref-476756-S38732265682012060500000)
NO Refer to «CHECKING MASS AIR FLOW (MAF) SENSOR»(ref-476756-S30530525252012060500000)

CHECKING MASS AIR FLOW (MAF) SENSOR

Test drive the car for approximately 10 minutes

Read off the mass air flow (MAF) sensor correction factor. The value must be between 0.8 and 1.2

Note. There must not be any air leakage when this test is carried out.

Remedy as necessary.

Other information

To replace mass air flow (MAF) sensor, see «MASS AIR FLOW (MAF) SENSOR, REPLACING»(ref-476751-S11580805602012060500000) .

Continue Refer to «VERIFICATION»(ref-476756-S38732265682012060500000)

Test drive the car according to the TRIP schedule, see VERIFYING REPAIRS .

Do not turn off engine after test drive.

Connect the car to VIDA (Volvo scan tool) again.

Read off fuel trim status.

There should not be any faults when fuel trim is finished.

Was a fault detected?

YES Refer to «INFORMATION»(ref-476756-S05482317062012060500000)
NO VERIFIED: Troubleshooting has been completed.

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.

Check intake system for air leakage according to CHECK FOR AIR LEAKS IN THE INTAKE SYSTEM .

HINT: Air leakage in the intake system can occur through the canister purge (CP) valve, the secondary air solenoid valve and power brake booster.

Check the exhaust system for leakage according to CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM .

Check fuel and residual pressure according to CHECKING FUEL AND RESIDUAL PRESSURES .

Check that the oil level is between the minimum and maximum markings

Remedy as necessary.

Was a fault detected?

YES Refer to «VERIFICATION»(ref-476756-S35866712042012060500000)
NO Refer to «CHECKING MASS AIR FLOW (MAF) SENSOR»(ref-476756-S20185069782012060500000)

Test drive the car for approximately 10 minutes

Read off the mass air flow (MAF) sensor correction factor. The value must be between 0.8 and 1.2

Note. There must not be any air leakage when this test is carried out.

Remedy as necessary.

Other information

To replace mass air flow (MAF) sensor, see «MASS AIR FLOW (MAF) SENSOR, REPLACING»(ref-476751-S11580805602012060500000) .

Continue Refer to «VERIFICATION»(ref-476756-S35866712042012060500000)

Test drive the car according to the TRIP schedule, see VERIFYING REPAIRS .

Do not turn off engine after test drive.

Connect the car to VIDA (Volvo scan tool) again.

Read off fuel trim status.

There should not be any faults when fuel trim is finished.

Was a fault detected?

YES Refer to «INFORMATION»(ref-476756-S10907761262012060500000)
NO VERIFIED: Troubleshooting has been completed.

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.

Check the induction system for air leaks. See AIR LEAKAGE IN THE INTAKE SYSTEM, CHECKING

HINT: Air leakage in the intake system can occur through the evaporative emission system (EVAP) valve, the secondary air solenoid valve and power brake booster.

Remedy as necessary.

Continue Refer to «CHECKING THE FUEL PRESSURE AND RESIDUAL PRESSURE IN THE WORKSHOP»(ref-476756-S02152512352012060500000)

CHECKING THE FUEL INJECTION SYSTEM

Test drive the car for approximately 10 minutes

Check the mass air flow (MAF) sensor. Read off its correction factor. The value should be between 0.8 and 1.2.

Note. There must not be any air leakage when this test is carried out.

Remedy as necessary.

Other information

see «MASS AIR FLOW (MAF) SENSOR, REPLACING»(ref-476751-S11580805602012060500000)

Scheme 97

Continue Refer to «VERIFICATION»(ref-476756-S33833951092012060500000)

Test drive the car according to the TRIP schedule, see VERIFYING REPAIRS .

Do not turn off engine after test drive.

Connect the car to VIDA (Volvo scan tool) again.

Read off fuel trim status.

There should not be any faults when fuel trim is finished.

Was a fault detected?

YES Refer to «INFORMATION»(ref-476756-S39129391412012060500000)
NO VERIFIED: Troubleshooting has been completed.

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.

CHOOSING A METHOD FOR TAKING A READING

Note. For vehicles with demand activated fuel pumps (FP), perform Quick test of fuel pump (FP) using VIDA (Volvo scan tool).

The fuel pressure can be measured with the car stationary or while being driven. Residual pressure is measured with the car stationary.

When the car is being driven, see TAKING FUEL PRESSURE READINGS WHILE DRIVING THE CAR .

Continue Refer to «MEASURING THE LINE PRESSURE»(ref-476756-S24927728092012060500000)

Scheme 98

Scheme 98: MEASURING THE LINE PRESSURE

Connect the pressure gauge according to «CONNECTING FUEL PRESSURE GAUGE»(ref-494826-S21621061982012081600000)
Remove the soundproofing panel
Remove the fuel pump (FP) relay (CMI 12 in the passenger compartment)
Connect a cable to the relay base as shown in the illustration. Read off the line pressure from the pressure gauge. The line pressure must be 375-395 kPa Check the residual pressure if the fuel pressure is OK. Remedy as necessary Other information For -2004, see: «CENTRAL ELECTRONIC MODULE (CEM), REPLACING»(ref-476708-S16664243282012060500000) For 2005-, see: «CENTRAL ELECTRONIC MODULE (CEM), REPLACING»(ref-476708-S02617745982012060500000) . For the location of and to replace the fuel pump (FP), see «RIGHT SIDE FUEL PUMP WITH LEVEL SENSOR»(ref-494834-S04997854762012081600000) see «REPLACING THE FUEL FILTER»(ref-476751-S40624388182012060500000) To disconnect the pressure gauge, see «DISCONNECTING FUEL PRESSURE GAUGE»(ref-494826-S02768373232012081600000) .

Is the rest pressure to be checked?

YES Refer to «CHECKING THE RESIDUAL PRESSURE»(ref-476756-S02993724942012060500000)
NO Refer to «CHECKING THE FUEL INJECTION SYSTEM»(ref-476756-S22537369232012060500000)

CHECKING THE RESIDUAL PRESSURE

Switch off the ignition
Disconnect the cable between the terminals on the relay base
Reinstall the fuel pump (FP) relay. The line pressure must not fall below 200 kPa within 20 minutes of the fuel pump (FP) being shut-off. Remedy as necessary Other information see «INJECTOR/PULSE DAMPER, REPLACEMENT»(ref-476751-S08802042072012060500000) For -2004, see: «CENTRAL ELECTRONIC MODULE (CEM), REPLACING»(ref-476708-S16664243282012060500000) For 2005-, see: «CENTRAL ELECTRONIC MODULE (CEM), REPLACING»(ref-476708-S02617745982012060500000) . For the location of and to replace the fuel pump (FP), see «RIGHT SIDE FUEL PUMP WITH LEVEL SENSOR»(ref-494834-S04997854762012081600000) To disconnect the pressure gauge, see «DISCONNECTING FUEL PRESSURE GAUGE»(ref-494826-S02768373232012081600000) .

Continue Refer to «CHECKING THE FUEL INJECTION SYSTEM»(ref-476756-S22537369232012060500000)

Engine Control Module (ECM) Diagnostic Trouble Codes - 2 of 13: Other Volvo XC90 I

SIGNAL TOO HIGH/SIGNAL TOO LOW/SIGNAL MISSING

VERIFICATION

Scheme 95

Scheme 96

FAULT-TRACING INFORMATION

FAULTY SIGNAL

SIGNAL MISSING

SIGNAL TOO HIGH

SIGNAL TOO LOW

CHECKING THE STATUS

CHECKING THE CONNECTOR

CHECKING CABLES

INTERNAL FAULT

SIGNAL TOO HIGH / SIGNAL MISSING / FAULTY SIGNAL

CHECKING THE FUEL INJECTION SYSTEM FOR LEAKAGE

CHECKING COMPONENTS

SIGNAL TOO HIGH / SIGNAL TOO LOW

CHECKING FUEL INJECTION SYSTEM

CHECKING MASS AIR FLOW (MAF) SENSOR

CHECKING THE FUEL INJECTION SYSTEM

Scheme 97

CHOOSING A METHOD FOR TAKING A READING

Scheme 98

CHECKING THE RESIDUAL PRESSURE

More articles — Engine Control Module (ECM) Diagnostic Trouble Codes - 2 of 13

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