DTC P0626:00 [MZI-3.7]

id0102d2315300

DTC P0626:00 | Generator field terminal circuit high
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DETECTION CONDITION | • The PCM monitors generator load from the generator/regulator in the form of frequency. The concern indicates the input is higher than the load should be in normal operation. The load input could be high when a battery short to ground exists.
POSSIBLE CAUSE | • Poor installation of generator terminal • Short to power supply between generator terminal RC and PCM terminal 1BF • Short to power supply between generator terminal LI and PCM terminal 1O • PCM connector or terminal malfunction • Open circuit in wiring harness between generator terminal RC and PCM terminal 1BF • Poor installation of battery positive terminal • Open circuit between generator terminal B and battery positive terminal • PCM connector or terminal 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 | INSPECT GENERATOR TERMINAL FOR POOR INSTALLATION • Turn the engine switch off. • Inspect generator terminal B for looseness. • Are there any malfunction? | Yes | Connect generator terminal B correctly, then go to Step 9.
No | Go to the next step.
4 | INSPECT GENERATOR CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the following terminals: ― Generator terminal RC (wiring harness-side) and body ground. ― Generator terminal LI (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Repair or replace suspected part, then go to Step 9.
No | Go to the next step.
5 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Are there any malfunction? | Yes | Repair or replace suspected part, then go to Step 9.
No | Go to the next step.
6 | INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT • PCM connector is disconnected. • Disconnect the generator connector. • Inspect for continuity between generator terminal RC (wiring harness-side) and PCM terminal 1BF (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 9.
7 | INSPECT BATTERY POSITIVE TERMINAL FOR POOR INSTALLATION • Turn the engine switch off. • Inspect the battery positive terminal for looseness. • Is there any malfunction? | Yes | Connect the battery positive terminal correctly, then go to Step 9.
No | Go to the next step.
8 | INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT • Generator and PCM connectors are disconnected. • Inspect the continuity between generator terminal B (wiring harness-side) and battery positive terminal (wiring harness-side) • Is there continuity? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0626:00 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.
10 | 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.