DTC P0131:00, P0151:00 [MZI-3.7]

id0102d2994300

DTC P0131:00 DTC P0151:00 | P0131:00: A/F sensor (RH) low voltage P0151:00: A/F sensor (LH) low voltage
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DETECTION CONDITION | • P0131:00 indicates A/F sensor (RH) low voltage • P0151:00 indicates A/F sensor (LH) low voltage • The PCM monitors the A/F sensor for a circuit concern. This DTC sets when the PCM detects a concern with one of the circuits used to determine the oxygen content in the exhaust gas.
POSSIBLE CAUSE | • A/F sensor malfunction • Connector or terminal malfunction • P0131:00: ― Short to ground in wiring harness between the following terminals: • A/F sensor (RH) terminal F—PCM terminal 2AG • A/F sensor (RH) terminal H—PCM terminal 2AC ― Open circuit in wiring harness between the following terminals: • A/F sensor (RH) terminal F—PCM terminal 2AG • A/F sensor (RH) terminal H—PCM terminal 2AC • P0151:00: ― Short to ground in wiring harness between the following terminals: • A/F sensor (LH) terminal F—PCM terminal 2AK • A/F sensor (LH) terminal H—PCM terminal 2AE ― Open circuit in wiring harness between the following terminals: • A/F sensor (LH) terminal F—PCM terminal 2AK • A/F sensor (LH) terminal H—PCM terminal 2AE • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0131:00 or P0151:00 on FREEZE FRAME DATA? | Yes | Go to the next step.
No | Go to troubleshooting procedures for DTC on FREEZE FRAME DATA. (See DTC TABLE [MZI-3.7].)
2 | 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.
3 | 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.
4 | VERIFY RELATED PENDING OR STORED DTC • Turn the ignition switch off, then to the ON position (engine off). • Verify the pending code or stored DTCs using the M-MDS. • Is other DTC present? | Yes | Go to the appropriate DTC troubleshooting procedures. (See DTC TABLE [MZI-3.7].)
No | Go to the next step.
5 | INSPECT A/F SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the suspect A/F sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 10.
No | Go to the next step.
6 | INSPECT A/F SENSOR CIRCUIT FOR SHORT TO GROUND • Suspect A/F sensor connector is disconnected. • Turn the ignition switch off. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― P0131:00: • A/F sensor (RH) terminal F • A/F sensor (RH) terminal H ― P0151:00: • A/F sensor (LH) terminal F • A/F sensor (LH) terminal H • Is there continuity? | Yes | If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to Step 10.
No | Go to the next step.
7 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Suspect A/F sensor connector is disconnected. • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 10.
No | Go to the next step.
8 | INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT • Suspect A/F sensor and PCM connectors are disconnected. • Turn the ignition switch off. • Inspect for continuity between the following terminals (wiring harness-side): ― P0131:00: • A/F sensor (RH) terminal F—PCM terminal 2AG • A/F sensor (RH) terminal H—PCM terminal 2AC ― P0151:00: • A/F sensor (LH) terminal F—PCM terminal 2AK • A/F sensor (LH) terminal H—PCM terminal 2AE • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible open circuit, then go to Step 10.
9 | INSPECT A/F SENSOR • Reconnect all disconnected connectors. • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZI-3.7].) • Is there any malfunction? | Yes | Replace the A/F sensor, then go to the next step. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P0131:00, P0151:00 HAS BEEN COMPLETED • Make sure to reconnect all disconnected connectors. • 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.
11 | 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.