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DTC P1605: Battery backup line(PHEV-ECU)
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • The power supply mode of electric motor switch is ON.
  • The PHEV-ECU power supply voltage is more than 10 volts.
Judgment Criterion
  • The backup voltage is less than 6 volts for 2 seconds.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of fuse.
  • Malfunction of the ETACS-ECU.
  • 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 whether the other DTC is set.
Check if DTC B210A or B210B is set in the ETACS-ECU (Refer to GROUP 54A - ETACS, Diagnostic Trouble Code Chart ).
Is the DTC set?
Carry out troubleshooting for the DTC B210A, B210B [Refer to GROUP 54A - ETACS, "DTC B210A: +B power supply (low), DTC B210B: +B power supply (high)" ]. Then go to Step 6.
Go to Step 2.
 
STEP 2. Voltage measurement at PHEV-ECU connector (terminal BAT).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the PHEV-ECU connector (terminal BAT) 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 open circuit and short circuit (ETACS-ECU and the PHEV-ECU).
Check the wiring harness between ETACS-ECU connector (terminal BUP3 and BUP4) and the PHEV-ECU connector (terminal BAT).
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Repair the connector or wiring harness. Then go to Step 6.
 
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is the DTC set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ). Then go to Step 5.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is DTC set?
Replace the PHEV-ECU (Refer to ). Then go to Step 6.
The inspection is complete.
 
STEP 6. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is DTC set?
Retry the troubleshooting.
The inspection is complete.