DTC P0131 [AJ (3.0L Duratec)]

id0102a4804600

DTC P0131

HO2S-11 sensor circuit out of range low voltage

DETECTION CONDITION

• The PCM monitors the HO2S-11 voltage at the PCM terminal 60. If during testing the PCM detects that the HO2S-11 alternates between 0 and -1 V, the PCM determines the HO2S-11 circuit is out of range low voltage.

POSSIBLE CAUSE

• Contaminated HO2S-11 (water, fuel, etc.)
• Crossed HO2S-11 signal/signal return wiring

Diagnostic procedure

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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0131 on the FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to the FREEZE FRAME DATA DTC inspection.
4
CHECK FOR SOURCE OF POTENTIAL HO2S-11 CONTAMINATION
• Investigate the following items as potential sources of HO2S contamination:
- Use of unapproved silicon sealers.
- Fuel contaminated by silicon additives.
- Excessive oil burning. (rings, valve seals, oil overfill).
- Glycol leaking internally in the engine.
- Leaded-contaminated fuel.
- Short drive cycles in cold weather.
- Use of unapproved cleaning agents.
• Were any of the above conditions or concerns found during inspection?
Yes
Repair the source of contamination. Then go to Step 6.
No
Go to the next step.
5
VERIFY HARNESS PINS ARE IN PROPER LOCATION
• Measure the resistance between the following at the harness side connector.
- Between the PCM terminal 60 and HO2S-11 terminal 4.
- Between the PCM terminal 91 and HO2S-11 terminal 3.
• Is the resistance below 5 ohms?
Yes
Replace the HO2S-11, then go to the next step.
No
Repair harness pin locations, then go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P0131 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Drive the vehicle at 64 km/h {40 MPH} for at least 5 minutes.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.