P0131

DTC P0131 / P0132 / P0134 / P2237

DTC Detecting Condition and Trouble Area






Wiring Diagram

Refer to P0031 DTC P0031 / P0032.

DTC Confirmation Procedure

NOTE:

If DTCs other than aimed DTC are previously detected in DTC confirmation procedure, be sure to troubleshoot DTC previously detected.

P0131 / P0132:

1) Warm up engine to normal operating temperature.
2) Run engine at idle speed for 1 min.

P0134 / P2237:

3) Warm up engine to normal operating temperature.
4) Run engine at idle speed for 2 min.

DTC Troubleshooting

1.
Was "Engine and Emission Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Engine and Emission Control System Check Engine and Emission Control System Check.

2. DTC check

Is there any DTC(s) other than P0131, P0132, P0134 and P2237?
YES -
Go to troubleshooting for applicable DTC.
NO -
Go to Step 3.

3. A/F sensor signal circuit check

Turn OFF ignition switch and disconnect connectors from A/F sensor and ECM.
Check for proper terminal connection to A/F sensor and ECM connectors.
Check that A/F sensor signal circuits (A3 - A4) are as follows.
- Wiring harness resistance of each A/F sensor signal circuit is less than 3 ohms.
- Insulation resistance between each A/F sensor signal circuit and vehicle body ground is infinity.
- Insulation resistance of wire harness is infinity between each A/F sensor signal terminal and each terminal at A/F sensor connector.
- Circuit voltage of each A/F sensor signal circuit is 0 - 1 V with ignition switch in ON position.

Are they in good condition?
YES -
Go to Step 4.
NO -
Repair or replace defective wire harness.

4. DTC recheck

Replace A/F sensor. Air Fuel Ratio (A/F) Sensor Removal and Installation
Perform DTC confirmation procedure and check DTC.

Is DTC P0131, P0132, P0134 and P2237 still detected?
YES -
Substitute a known-good ECM and recheck.
NO -
End.