DTC P0137:00, P0157:00 [MZI-3.7]

id0102d2505000

DTC P0137:00 DTC P0157:00 | P0137:00: HO2S (RH) circuit low voltage P0157:00: HO2S (LH) circuit low voltage
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DETECTION CONDITION | • P0137:00 indicates that HO2S (RH) circuit low voltage • P0157:00 indicates that HO2S (LH) circuit low voltage • The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) for a circuit concern. This DTC sets when the PCM detects a concern with the circuit used to determine the oxygen content in the exhaust gas.
POSSIBLE CAUSE | • P0137:00: ― Open circuit in wiring harness between the following terminals: • HO2S (RH) terminal B—PCM terminal 3Z • HO2S (RH) terminal D—PCM terminal 2G ― Short to ground in wiring harness between HO2S (RH) terminal B and PCM terminal 3Z ― Short to power supply in wiring harness between HO2S (RH) terminal B and PCM terminal 3Z • P0157:00: ― Open circuit in wiring harness between the following terminals: • HO2S (LH) terminal B—PCM terminal 3AB • HO2S (LH) terminal D—PCM terminal 2G ― Short to ground in wiring harness between HO2S (LH) terminal B and PCM terminal 3AB ― Short to power supply in wiring harness between HO2S (LH) terminal B and PCM terminal 3AB • Damaged HO2S sensor • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE 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.
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. • Turn the ignition switch 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.
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. • Suspect HO2S and PCM connectors are disconnected. • Turn the ignition switch off. • Measure the resistance between the following terminals (wiring harness-side): ― P0137:00: • HO2S (RH) terminal B—PCM terminal 3Z • HO2S (RH) terminal D—PCM terminal 2G ― P0157:00: • HO2S (LH) terminal B—PCM terminal 3AB • HO2S (LH) terminal D—PCM terminal 2G • Is the resistance less than 5 ohm? | Yes | Go to the next step.
No | Repair for open circuit, then go to Step 8.
5 | CHECK HO2S CIRCUIT FOR SHORT TO GROUND • Suspect HO2S and PCM connectors are disconnected. • Measure the resistance between the following suspect HO2S terminals: ― P0137:00: • HO2S (RH) terminals B and D (wiring harness-side) • HO2S (RH) terminal B (wiring harness-side) and body ground ― P0157:00: • HO2S (LH) terminals B and D (wiring harness-side) • HO2S (LH) terminal B (wiring harness-side) and body ground • Is the resistance greater than 10 kilohms? | Yes | Go to the next step.
No | Repair for short circuit, then go to Step 8.
6 | CHECK HO2S CIRCUIT FOR SHORT TO POWER SUPPLY IN WIRING HARNESS • Suspect HO2S and PCM connectors are disconnected. • Turn the ignition switch to the ON position (engine off). • Measure the voltage between the following suspect HO2S terminals (wiring harness-side) and body ground: ― HO2S (RH) terminal B (P0137:00) ― HO2S (LH) terminal B (P0157:00) • Is any voltage present? | Yes | Repair for short circuit, then go to Step 8.
No | Go to the next step.
7 | CHECK HO2S CIRCUIT CONTINUITY Note • HO2S is displayed as HO2S on the scan tool. • Suspect HO2S and PCM connectors are disconnected. • Turn the ignition switch off. • Connect the PCM connector. • Connect a 5 A fused jumper wire between suspect HO2S terminals (wiring harness-side) 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 [MZI-3.7].)
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. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • 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 [MZI-3.7].) Go to the next step.
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.