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DTC P1034: ELC.P.lock B/U supply VOLT. low
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets this DTC when the backup power supply fails.
 
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of the electrical parking driver unit.
  • Malfunction of the PHEV-ECU.
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Using scan tool (M.U.T.-IIISE), check the data list (electrical parking driver unit).
Check that the following data list display contents are normal (Refer to GROUP 22A - Data List Reference Table ).
Data list
  • Item No.16: Back up power supply fail flag
 
Check conditionNormal condition
The parking lock statusNormalOFF
AbnormalON
Is the check result normal?
Go to Step 5.
Go to Step 2.
 
STEP 2. Voltage measurement at the electrical parking driver unit connector.
(1) Disconnect the electric parking driver unit connector and measure at the wiring harness side.
(2) Measure the voltage between terminal BATT and body ground.
OK: Approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 4.
Go to Step 3.
 
STEP 3. Check the power supply line for short to ground circuit and open circuit (ETACS-ECU and electrical parking driver unit).
Is the check result normal?
Go to Step 4.
Repair the connector or wiring harness.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the electrical parking driver unit (Refer to GROUP 22A - Electrical Parking Drive Unit ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 5. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).