Diagnostic Procedure

DTC P2237 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 the next step.
2	VERIFY RELATED REPAIR 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	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P2237 on FREEZE FRAME DATA?	Yes	Go to the next step.
3		No	Go to troubleshooting for DTC on FREEZE FRAME DATA. (See DTC TABLE ).
4	INSPECT FRONT HO2S CONNECTOR FOR POOR CONNECTION Turn the ignition switch to off. Disconnect the front HO2S 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 7.
4		No	Go to the next step.
5	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 7.
5		No	Go to the next step.
6	INSPECT FRONT HO2S POSITIVE CURRENT CIRCUIT FOR OPEN CIRCUIT Front HO2S and PCM connectors disconnected. Verify the continuity between PCM terminal 2AD (wiring harness-side) and front HO2S terminal 1A (wiring harness-side). Is there continuity?	Yes	Replace the front HO2S, then go to the next step.
6		No	Repair or replace wiring harness for open, then go to the next step.
7	VERIFY TROUBLESHOOTING OF DTC P2237 COMPLETED Make sure to reconnect all disconnected Clear the DTC from the PCM memory using the WDS or equivalent. Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST ). Is the PENDING CODE for this DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
7		No	Go to the next step.
8	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 ).
8		No	Troubleshooting completed.