Diagnostic Test

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase BPCM DTCs.
3. Turn the ignition off. Wait one minute.
4. Turn the ignition on. Wait one minute.
  NOTE:
  The vehicle may have to be operated in order to increase the battery pack coolant temperature enough to cause the battery coolant temperature sensor readings to change.
5. With a scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2
  No
  - The condition or conditions that originally set this DTC are not present at this time. Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE COOLANT LEVEL
1. Turn the ignition off.
2. Check the battery coolant reservoir fluid level.
  Is the battery coolant fluid level excessively low?
  
  Yes
  - Perform the HIGH-VOLTAGE BATTERY COOLANT SYSTEM PRESSURE TEST. Refer to HIGH-VOLTAGE BATTERY COOLING AND HEATING SYSTEM, STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (K25) RADIATOR COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR OPEN/HIGH RESISTANCE
1. Disconnect the Radiator Coolant Temperature Sensor harness connector.
2. Disconnect the High Voltage Battery Pack C3 low voltage harness connector.
3. Measure the resistance of the (K25) Radiator Coolant Temperature Sensor Signal circuit between the Radiator Coolant Temperature Sensor harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (K25) Radiator Coolant Temperature Sensor Signal circuit for an open circuit or high resistance.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K91) RADIATOR COOLANT TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K91) Radiator Coolant Temperature Sensor Ground circuit between the Radiator Coolant Temperature Sensor harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (K91) Radiator Coolant Temperature Sensor Ground for an open circuit or high resistance.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
RADIATOR COOLANT TEMPERATURE SENSOR
1. Connect the High Voltage Battery Pack C3 low voltage harness connector.
2. Connect a jumper wire between the (K25) Radiator Coolant Temperature Sensor Signal circuit and the (K91) Radiator Coolant Temperature Sensor Ground circuit in the Radiator Coolant Temperature Sensor harness connector.
3. Turn the ignition on.
4. With the scan tool, erase BPCM DTCs.
5. Turn the ignition off. Wait one minute.
6. Turn the ignition on. Wait one minute.
7. With the scan tool, read DTCs.
  Does the scan tool display DTC P00B3-00 RADIATOR COOLANT TEMPERATURE SENSOR CIRCUIT LOW as active?
  
  Yes
  - Replace the Radiator Coolant Temperature Sensor in accordance with the Service Information.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
BATTERY PACK CONTROL MODULE (BPCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Radiator Coolant Temperature Sensor and the High Voltage Battery Pack.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the High Voltage Battery Pack in accordance with the Service Information. Refer to BATTERY, HIGH-VOLTAGE, REMOVAL .
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .