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DTC No. P0C44-00 Coolant Temperature Sensor (Outlet) Out of Lower Range Diagnosis
 
 
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • BMU monitor
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
  • Battery Management Unit (BMU) power supply voltage is more than 7.578 volts.
Judgment Criterion
  • The voltage of the drive battery refrigerant temperature sensor No. 1 is 0.15128 volt or less [at 90°C (194°F) or more] for 30 seconds.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • Malfunction of the drive battery cooler pipe assembly
  • Malfunction of the BMU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
1.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
2.Drive battery control wiring harness check (Drive battery refrigerant temperature sensor signal line)
(1) Disassemble the drive battery (Refer to SERVICE PROCEDURE).
(2) Check the following wiring harness for short to ground circuit.
  • Between the BMU connector (terminal No. 24) and the drive battery cooler pipe assembly connector (terminal No. 1)
Is the check result normal?
Repair the connector(s) or wiring harness. Then,
 
3.Drive battery refrigerant temperature sensor check
Check the drive battery refrigerant temperature sensor check (Refer to DRIVE BATTERY COOLANT TEMPERATURE SENSOR CHECK).
Is the check result normal?
Replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION). Then,
Replace the drive battery cooler pipe assembly (Refer to SERVICE PROCEDURE). Then,
 
4.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.