| P0620 | Generator control circuit malfunction |
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DETECTION CONDITION
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• The PCM monitors the input voltage from the generator signal. If the voltages at PCM deviates from the threshold, the PCM terminal 213 determines that the there is a generator circuit problem.
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POSSIBLE CAUSE
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• Generator malfunction
• PCM and/or generator are poorly connected
• Open circuit and/or short to ground in the wiring harness from between generator terminal C and PCM terminal 213
• Connector or terminal malfunction
• PCM malfunction
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Diagnostic procedure
| STEP | INSPECTION | ACTION | |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the M-MDS to the DLC-2.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
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4
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INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION
• Disconnect the generator connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
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Yes
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Repair or replace terminals, then go to Step 8.
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No
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Go to the next step.
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5
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INSPECT GENERATOR
• Inspect the generator.
• Is there any malfunction?
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Yes
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Replace the generator, then go to Step 8.
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No
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Go to the next step.
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6
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
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Yes
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Repair the terminals, then go to Step 8.
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No
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Go to the next step.
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7
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INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between generator terminal C (wiring harness-side) and PCM terminal 213 (wiring harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit, then go to the next step.
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8
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VERIFY THAT DTC P0620 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all connectors.
• Clear DTC from PCM memory using M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Replace PCM, then go to the next step.
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No
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Go to the next step.
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9
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VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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