DTC P0620:00 [MZI-3.7]

id0102d2315100

DTC P0620:00 | Generator control circuit
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DETECTION CONDITION | • The PCM reads the generator and sends a DTC through the network when the generator indicates a concern.
POSSIBLE CAUSE | • Drive belt misadjustment • Poor installation generator • Short to power supply between generator terminal LI and PCM terminal 1O • Short to ground between generator terminal LI and PCM terminal 1O • PCM connector or terminal malfunction • Open circuit between generator terminal LI and PCM terminal 1O • Poor installation battery positive terminal • Open circuit between generator terminal B and battery positive terminal • Generator malfunction • 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 | INSPECT DRIVE BELT CONDITION • Verify that drive belt auto tensioner indicator mark does not exceed limit. • Is drive belt normal? | Yes | Go to the next step.
No | Replace and/or adjust drive belt, then go to Step 12. (See DRIVE BELT REMOVAL/INSTALLATION [MZI-3.7].)
4 | 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 12.
No | Go to the next step.
5 | INSPECT GENERATOR CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure voltage between generator terminal LI (wiring harness-side) and body ground. • Is voltage B+? | Yes | Repair or replace suspected part, then go to Step 12.
No | Go to the next step.
6 | INSPECT GENERATOR CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between generator terminal LI (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace suspected part, then go to Step 12.
No | Go to the next step.
7 | 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 12.
No | Go to the next step.
8 | INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT • PCM connector is disconnected. • Disconnect the generator connector. • Inspect for continuity between generator terminal LI (wiring harness-side) and PCM terminal 1O (wiring harness-side) • Is there continuity? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 12.
9 | 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 12.
No | Go to the next step.
10 | INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT • Inspect 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 Step 12.
11 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZI-3.7].) • Is there any malfunction? | Yes | Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
12 | VERIFY TROUBLESHOOTING OF DTC P0620:00 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.
13 | 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.