Diagnostic procedure

DTC P2251 [L3] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) Is the DTC P2251 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
1		No	Go to troubleshooting for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE .)
2	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?	Yes	Go to the next step.
2		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3	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 the next step.
3		No	Go to the next step.
4	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 the M-MDS. Is the DTC P0030, P0031 or P0032 also present?	Yes	Go to appropriate DTC troubleshooting procedure. (See DTC TABLE .)
4		No	Go to the next step.
5	INSPECT A/F SENSOR CONNECTOR FOR POOR CONNECTION Turn the ignition switch to off. Disconnect the A/F sensor connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch to off. Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
6		No	Go to the next step.
7	INSPECT A/F SENSOR NEGATIVE CURRENT CONTROL CIRCUIT FOR OPEN CIRCUIT A/F sensor and PCM connectors disconnected. Verify the continuity between PCM terminal 2AC and D (wiring harness-side). Is there continuity?	Yes	Replace the A/F sensor, then go to the next step.
7		No	Repair or replace for an open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P2251 COMPLETED Make sure to reconnect all disconnected connectors Clear the DTC from the PCM memory using the M-MDS. Perform the KOEO or KOER self-test. (See AFTER REPAIR PROCEDURE .) Is the DTC P2251 present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
9		No	Troubleshooting completed.