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INSPECTION PROCEDURE 2: 12V starter battery discharged
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
When any of the symptoms occurs, the on board charger/DC-DC converter and charging control system is failed.
 
 
 
PROBABLE CAUSES
  • The 12V starter battery is flat due to the reasons below:
    • The power supply mode of the electric motor switch remains at ACC or ON.
    • The OSS system fails
  • Malfunction of the on board charger/DC-DC converter
  • Malfunction of the PHEV-ECU
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. 12V starter battery check
Refer to GROUP 54A - Battery Test .
Is the check result normal?
Go to Step 2.
  • Charge the 12V starter battery (Refer to GROUP 54A - Charge ). Or, replace the 12V starter battery (Refer to GROUP 54A - Battery ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the actuator test. <PHEV-ECU>
Execute the following actuator tests (Refer to ).
  • Item No.2: 12V DCDC shutdown
OK: When the actuator test is started, the DC-DC converter drive stops.
Is the check result normal?
Go to Step 3.
Replace the PHEV-ECU (Refer to ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check the data list. <On board charger/DC-DC converter>
Check that the following data list display contents are normal (Refer to ).
  • Item No.51: DCDC Output voltage(S terminal)
OK: 13.7 to 14.8 V [READY (ready to drive) indicator illuminates]
Is the check result normal?
Go to Step 4.
Check if any DTC related to the balancer is set in the on board charger/DC-DC converter (Refer to GROUP 54Dd - Diagnosis Code Chart ).
 
STEP 4. Retest the system.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Replace the PHEV-ECU (Refer to ).