DTC P1633:00 [MZI-3.7]

id0102d2318000

DTC P1633:00 | Keep alive power voltage too low
--- | ---
DETECTION CONDITION | • Indicates the keep alive power circuit has experienced a voltage interrupt.
POSSIBLE CAUSE | • Connector or terminal malfunction • Open circuit between battery positive terminal and PCM terminal 1V

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 BATTERY TERMINAL AND PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect battery terminal and PCM connector. • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace suspected part, then go to Step 5.
No | Go to the next step.
4 | INSPECT KEEP ALIVE POWER CIRCUIT FOR OPEN CIRCUIT • PCM connector is disconnected. • Turn the ignition switch off. • Disconnect battery cables. • Check continuity between battery positive terminal (wiring harness-side) and PCM terminal 1V (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P1633:00 HAS BEEN COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • 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.
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.