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DTC P0A1C: RMCU internal fail(1)
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
The torque of the drive motor and the starter generator is monitored by the PHEV-ECU, checking that the drive motor and the starter generator are safely controlled.
 
 
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)
  • Motor/Generator control circuit monitor
  • EV-CAN monitor
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 9.0 volts.
  • The motor/generator drive signal is ON or OFF.
Judgment Criterion
  • When the motor/generator drive signal is ON, a state where the IGBT is OFF continues for 2 seconds
  • When the motor/generator drive signal is OFF, a state where the IGBT is ON continues for 2 seconds
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
PROBABLE CAUSES
  • Malfunction of the REMCU.
  • Damaged harness or connector.
  • Malfunction of the PHEV-ECU.
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check if DTC P1047 or P1048 is set in the PHEV-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC (Refer to ). Then go to Step 3.
Go to Step 2.
 
STEP 2. 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 REMCU (Refer to GROUP 54Db - REMCU Removal and Installation ). Then go to Step 3.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 3. 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?
Retry the troubleshooting.
The procedure is complete.