Diagnostic Procedure

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STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VISUALLY INSPECT HO2S AND PCM WIRING HARNESS NOTE: Disconnect the HO2S wiring harness connector. Only the suspect HO2S needs to be diagnosed. Switch the ignition to off. Disconnect the suspect HO2S and PCM connectors. Visually inspect the HO2S wiring harness. Check the connector (both halves) for contamination Make sure the connector pins are fully seated Is a concern present?	Yes	Repair if necessary. Go to Step 8.
3		No	Go to the next step.
4	CHECK HO2S CIRCUIT(S) FOR OPEN IN HARNESS NOTE: Diagnose the suspect sensor indicated by the DTC. Verify the harness pins are in the correct location. HO2S and PCM connectors are disconnected. Switch the ignition to off. Measure the resistance between: For DTC P0137:00: PCM terminal 3Z (wiring harness-side) and HO2S (RH) terminal B (wiring harness-side) PCM terminal 2G (wiring harness-side) and HO2S (RH) terminal D (wiring harness-side) For DTC P0157:00: PCM terminal 3AB (wiring harness-side) and HO2S (LH) terminal B (wiring harness-side) PCM terminal 2G (wiring harness-side) and HO2S (LH) terminal D (wiring harness-side) Is the resistance less than 5 ohm?	Yes	Go to the next step.
4		No	Repair for open circuit, then go to Step 8.
5	CHECK HO2S CIRCUIT FOR SHORT TO GROUND HO2S and PCM connectors are disconnected. Measure the resistance between: Suspect HO2S terminal B and D (wiring harness-side) Suspect HO2S terminal B (wiring harness-side) and body ground Is the resistance greater than 10 kilohms?	Yes	Go to the next step.
5		No	Repair for short circuit, then go to Step 8.
6	CHECK HO2S CIRCUIT FOR SHORT TO POWER SUPPLY IN WIRING HARNESS HO2S and PCM connectors are disconnected. Switch the ignition to ON (engine off). Measure the voltage between suspect HO2S terminal B (wiring harness-side) and ground. Is any voltage present?	Yes	Repair for short circuit, then go to Step 8.
6		No	Go to the next step.
7	CHECK HO2S CIRCUIT CONTINUITY NOTE: HO2S is displayed as HO2S on the scan tool. HO2S connector is disconnected. Switch the ignition to off. Connect the PCM connector. Connect a 5 A fused jumper wire between suspect HO2S harness-side connector terminal B and C. Start the engine and run it at idle. Access the PCM and monitor the suspect HO2S signal PID (VOLT). Is the voltage greater than 1 V?	Yes	Replace the HO2S, then go to the next step. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION .)
7		No	Go to the next step. (The system is operating normal at this time. The concern may have been caused by a loose or corroded connector.)
8	VERIFY TROUBLESHOOTING OF DTC P0137:00, P0157:00 HAS BEEN COMPLETED Verify that all disconnected connectors are reconnected. Switch the ignition to ON (Engine off). Clear the DTC from the PCM memory using the M-MDS. Perform the KOER self-test. (See KOEO/KOER SELF TEST .) Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION .) Go to the next step.
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.