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DTC Troubleshooting

P0620 DIAGNOSIS PROCEDURE

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B .
2  Accessory drive belt check 
  1. Check accessory drive belt for proper tension, see ACCESSORY DRIVE BELT TENSION INSPECTION .

Is it in good condition? 		 Go to Step 3. Repair or replace defective part.
3  Generator control signal output circuit check 
  1. Turn OFF ignition switch and connectors from generator and ECM.
  2. Check for proper terminal connection to generator connector and ECM connectors.
  3. If connections are OK, check that generator control signal output circuit (A1) is as follows.
    • Wiring harness resistance of generator control signal output circuit is less than 3 Ω.
    • Insulation resistance between generator control signal output circuit and vehicle body ground is infinity.
    • Insulation resistance of wire harness is infinity between generator control signal output circuit terminal and each other terminal at generator connector.
    • Circuit voltage of generator control signal output circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4 
  1. Replace generator, see GENERATOR REMOVAL AND INSTALLATION .
  2. Check DTC.

Is DTC P0620 still detected? 		 Substitute a known-good ECM and recheck. End.
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