DTC P2237:00, P2240:00 [MZI-3.7]

id0102d2506000

DTC P2237:00 DTC P2240:00 | P2237:00: A/F sensor (RH) positive current control circuit/open P2240:00: A/F sensor (LH) positive current control circuit/open
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DETECTION CONDITION | • P2237:00 indicates that A/F sensor (RH) positive current control circuit/open • P2240:00 indicates that A/F sensor (LH) positive current control circuit/open • The powertrain control module (PCM) monitors the A/F sensor 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 | • A/F sensor connector or terminals malfunction • Open circuit in wiring harness between the following terminals: ― A/F sensor (RH) terminal G—PCM terminal 2AS ― A/F sensor (LH) terminal G—PCM terminal 2AO • Damaged A/F 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 A/F SENSOR HARNESS • Turn the ignition switch off. • Disconnect the suspect A/F sensor connector. • Visually inspect suspect A/F sensor for: ― Pinched, shorted, and corroded wiring and pins ― Oil or water contamination ― Crossed sensor wires ― Damaged A/F sensor • Is a concern present? | Yes | Repair or replace the malfunctioning part according to the inspection results, then go to Step 5.
No | Go to the next step.
4 | CHECK A/F SENSOR CIRCUIT FOR AN OPEN IN THE HARNESS • Suspect A/F sensor connector is disconnected. • Turn the ignition switch off. • Disconnect the PCM connector. • Measure the resistance between the following terminals (wiring harness-side): ― A/F sensor (RH) terminal G—PCM terminal 2AS ― A/F sensor (LH) terminal G—PCM terminal 2AO • Is the resistance less than 5 ohm? | 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 | Repair for open circuit, then go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P2237:00, P2240:00 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.
6 | 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.