DTC P1464:00 [MZI-3.7]

id0102d2317600

DTC P1464:00 | A/C demand out of self-test range
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DETECTION CONDITION | • The DTC sets when the PCM receives a request for A/C during the self-test.
POSSIBLE CAUSE | • A/C or defrost on during self-test • Communication error between PCM and climate control module • Short to power supply between PCM terminal 1W and A/C relay • A/C switch signal malfunction • A/C relay malfunction • PCM malfunction Note • If the A/C or defrost was on during self-test, turn the A/C or defrost off and repeat the self-test. An A/C request to the PCM may come through the communication link or on a dedicated hardwire circuit from the A/C switch.

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 | VERIFY A/C AND DEFROST ARE OFF DURING SELF-TEST • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Are the A/C and defrost off during the self-test? | Yes | Go to the next step.
No | Turn the A/C and defrost off. Then go to Step 5.
4 | INSPECT ACCS PID • Turn the ignition switch to the ON position (Engine off). • A/C and defroster OFF. • Access the PCM and monitor the ACCS PID. • Is the PID state ON? | Yes | The ACCS PID indicates that the PCM is being requested to turn on the A/C. Inspect the A/C system. (See DIAGNOSTIC TROUBLE CODE NUMBER INSPECTION.) Then go to the next step.
No | The ACCS PID indicates that the ACCS input to the PCM is low. Inspect the following: • Short to power supply circuit between PCM terminal 1W and A/C relay • A/C relay Repair or replace if necessary. Go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P1464:00 HAS BEEN COMPLETED • Verify that all disconnected connectors 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 PENDING CODE for the 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.