DTC P0604: RAM error
caution
Before 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.
Judgment Criterion
When data stored in RAM fails.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1
.
PROBABLE CAUSES
Malfunction of the PHEV-ECU.
DIAGNOSIS
STEP 1. 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 if the DTC is set.
Is the DTC set?
Replace the PHEV-ECU (Refer to
). Then go to Step 2
.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction
).
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 3
.
(2)
Check if the DTC is set.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.