DTC P0040, P0041 [MZI-3.7]

id0102d2880000

DTC P0040

DTC P0041

P0040: Front HO2S (LH/RH) signals swapped

P0041: Rear HO2S (LH/RH) signals swapped

DETECTION CONDITION

•  P0040 indicates that during KOER testing, the front HO2S signal(s) response for a fuel shift to the correct engine bank was not indicated.

•  P0041 indicates that during KOER testing, the rear HO2S signal(s) response for a fuel shift to the correct engine bank was not indicated.

POSSIBLE CAUSE

•  Crossed HO2S harness connectors.

•  Crossed wiring at HO2S harness connectors.

•  Crossed wiring at PCM harness connector.

•  PCM malfunction

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

STEP

INSPECTION

ACTION

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 HO2S WIRING HARNESS CONNECTORS

•  For P0040, visually inspect the vehicle front HO2S wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses).

•  For P0041, visually inspect the vehicle rear HO2S 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, go to the next step.

No

Go to the next step.

4

VERIFY TROUBLESHOOTING OF DTC P0040, P0041 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.

•  Retrieve DTCs using the M-MDS.

•  Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [MZI-3.7].)

No

Go to the next step.

5

VERIFY AFTER REPAIR PROCEDURE

•   Perform “AFTER REPAIR PROCEDURE”.
(See AFTER REPAIR PROCEDURE [MZI-3.7].)

•   Are any DTC present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZI-3.7].)

No

Troubleshooting completed.

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		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.
2		No	Go to the next step.
3	INSPECT HO2S WIRING HARNESS CONNECTORS • For P0040, visually inspect the vehicle front HO2S wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses). • For P0041, visually inspect the vehicle rear HO2S 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, go to the next step.
3		No	Go to the next step.
4	VERIFY TROUBLESHOOTING OF DTC P0040, P0041 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. • Retrieve DTCs using the M-MDS. • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)
4		No	Go to the next step.
5	VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
5		No	Troubleshooting completed.