Whenever ECU is replaced, ensure that the CAN bus lines are normal.
DESCRIPTIONS OF MONITOR METHODS
Uniform temperature in the driving battery is achieved after the driving battery cooling fan has operated for an adequate amount of time.
The monitor is enabled during the following condition.
The driving battery cooling fan operates for 180 seconds or more.
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)
Driving battery ambient temperature sensor
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
The heater controller assembly (A/C-ECU) power supply voltage is between 10 and 16 volts.
The drive battery cooling fan drive status is on.
Time after above condition satisfied is more than 180 seconds.
The drive battery cooling compressor drive status is on.
Judgment Criterion
The difference between the battery cooling evaporator temperature value and the driving battery ambient temperature value changes to 15°C (59°F) or more within 240 seconds.
Check Conditions
The heater controller assembly (A/C-ECU) power supply voltage is between 10 and 16 volts.
The drive battery cooling fan drive status is on.
Time after above condition satisfied is more than 180 seconds.
The drive battery cooling compressor drive status is off.
Judgment Criterion
The difference between the battery cooling evaporator temperature value and the driving battery ambient temperature value changes to 26°C (79°F) or more within 240 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 4 .
PROBABLE CAUSES
Malfunction of the CAN bus
Malfunction of the heater controller assembly (A/C-ECU)
Malfunction of the PHEV-ECU.
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Scan tool (M.U.T.-IIISE) other system DTC [heater controller assembly (A/C-ECU)] (Refer to ).
Is the DTC set?
Troubleshoot for the relevant DTC. 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 4 .
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to GROUP 54Da - PHEV-ECU ). Then go to Step 3.
The procedure is complete.
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 4 .