Diagnostic procedure

DTC P0131, P0151 [AJ] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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 next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTC Turn the ignition switch off, then ON position (Engine off). Verify the related PENDING CODE or stored DTCs using M-MDS. Is other DTC present?	Yes	Go to appropriate DTC troubleshooting procedure. (See DTC TABLE ).
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P0131 or P0151 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting for DTC on FREEZE FRAME DATA. (See DTC TABLE ).
5	INSPECT FRONT HO2S SIGNAL CIRCUIT FOR SHORT TO GROUND AT HARNESS Turn the ignition switch off. Disconnect rear HO2S and PCM connectors. Verify the continuity between following HO2S terminal A (wiring harness side) and body ground. Is there continuity?	Yes	Replace short to ground circuit, then go to Step 8.
5		No	Go to the next step.
6	INSPECT FRONT HO2S SIGNAL CIRCUIT FOR SHORT TO GROUND AT FRONT HO2S Rear HO2S connector disconnected. Verify the continuity between following HO2S terminal A (part side) and body ground. Is there continuity?	Yes	Replace suspected HO2S then go to the next step.
6		No	Go to the next step.
7	INSPECT FRONT HO2S CIRCUIT FOR OPEN CIRCUIT Turn the ignition switch off. Check continuity between the following circuits: HO2S terminal A and PCM terminal 2AK (RF), 2AL (LF) HO2S terminal B and PCM terminal 2AV (RF), 2AX (LF) Is there continuity?	Yes	Repair or replace harness for open circuit, then go to the next step.
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0131 OR P0151 COMPLETED Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using M-MDS. Perform the KOEO or KOER SELF TEST using the M-MDS. (See KOEO/KOER SELF TEST ). Is the PENDING CODE same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE ). Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE ).
9		No	Troubleshooting completed.