STEP 1. Checking engine start conditions
STEP 2. Check battery itself
STEP 3. Check drive belt tension
STEP 4. Check of short to ground, open circuit and harness damage in ALTG line between generator connector and ECM connector.
STEP 5. Check of short to ground, open circuit and harness damage in ALTL line between generator connector and ECM connector.
STEP 6. Check of harness damage in BACK line between battery and ECM connector.
STEP 7. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (2) Start the engine and run at idle.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P0620 stored?
Go to Step 8. It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ Inspection Service Points - How to Cope with Intermittent Malfunctions .
STEP 8. Replace the drive belt.
(1) Replace the drive belt.
(2) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (3) Start the engine and run at idle.
(4) After the DTC has been deleted, read the DTC again.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P0620 stored?
Go to Step 9. The inspection is complete.
STEP 9. Replace the generator.
(1) Replace the generator.
(2) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (3) Start the engine and run at idle.
(4) After the DTC has been deleted, read the DTC again.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P0620 stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 10. The inspection is complete.
STEP 10. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (2) Start the engine and run at idle.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P0620 stored?
Retry the troubleshooting. The inspection is complete.