DTC P164B:00 [MZI-3.7]

id0102d2318600

DTC P164B:00 | A/F sensor (LH) positive current trim circuit performance
--- | ---
DETECTION CONDITION | • A resistor is installed in the A/F sensor (LH) connector for part to part variance. The PCM determines the value of this resistor by taking multiple measurements of the resistor during each key on event. The PCM uses this value in order to compensate for the variance in the pumping current signal. The test fails if the PCM receives an inconsistent or erratic measurement of the resistor.
POSSIBLE CAUSE | • Connector or terminal malfunction • A/F sensor (LH) malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
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 | INSPECT A/F SENSOR (LH) CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the A/F sensor (LH) connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are there any malfunction? | Yes | Repair or replace suspected part, then go to Step 7.
No | Go to the next step.
4 | INSPECT A/F SENSOR (LH) PUMPING CURRENT TRIM CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS • A/F sensor (LH) connector is disconnected. • Disconnect the PCM connector. • Measure the resistance between A/F sensor (LH) wiring harness-side connector terminal D and PCM harness-side connector terminal 2BF. • Is the resistance less than 5 ohms? | Yes | Go to the next step.
No | Repair for an open circuit, then go to Step 7.
5 | INSPECT A/F SENSOR (LH) PUMPING CURRENT TRIM CIRCUIT FOR SHORT CIRCUIT TO GROUND • A/F sensor (LH) and PCM connectors are disconnected. • Measure the resistance between A/F sensor (LH) wiring harness-side connector terminal D and ground. • Is the resistance greater than 10 kilohms? | Yes | Go to the next step.
No | Repair a short to the ground circuit, then go to Step 7.
6 | INSPECT RESISTANCE OF LABEL RESISTOR IN A/F SENSOR • A/F sensor (LH) and PCM connectors are disconnected. • Measure the resistance between A/F sensor connector terminal D and C on the component side. • Is the resistance between 3.5—1,000 kilohms? | Yes | Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”. (Unable to duplicate or identify the concern at this time.) Then go to the next step.
No | Replace the suspect A/F sensor (LH). (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
7 | VERIFY TROUBLESHOOTING OF DTC P164B:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the same 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.
8 | 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.