DTC P0040:00, P0041:00 [MZI-3.7]

id0102d2311200

DTC P0040:00 DTC P0041:00 | P0040:00: A/F sensor (LH/RH) signals swapped P0041:00: HO2S (LH/RH) signals swapped
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DETECTION CONDITION | • P0040:00 indicates that during KOER testing, the A/F sensor signal(s) response for a fuel shift to the correct engine bank was not indicated. • P0041:00 indicates that during KOER testing, the HO2S signal(s) response for a fuel shift to the correct engine bank was not indicated.
POSSIBLE CAUSE | • P0040:00: Crossed A/F sensor harness connectors. • P0040:00: Crossed wiring at A/F sensor harness connectors. • P0041:00: Crossed HO2S harness connectors. • P0041:00: Crossed wiring at HO2S harness connectors. • Crossed wiring at PCM harness connector. • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT A/F SENSOR/HO2S WIRING HARNESS CONNECTORS • For P0040:00, visually inspect the vehicle A/F sensor wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses). • For P0041:00, visually inspect the vehicle HO2S wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses). • For P0040:00, P0041:00, visually inspect the vehicle PCM of A/F sensor/HO2S signals wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses). • Are there crossed connections or wires? | Yes | Repair if necessary.
No | Unable to duplicate or identify the cause of concern at this time. Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure.
4 | VERIFY TROUBLESHOOTING OF DTC P0040:00, P0041:00 HAS BEEN COMPLETED • Verify that all disconnected connectors reconnected. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the M-MDS. • Start the engine and run it at idle. • Perform the KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
5 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.