Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

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
  - Go To 5
  No
  - Go To 2
CHECK THE (A902) FUSED B(+) CIRCUITS FOR AN OPEN OR SHORT CIRCUIT
1. Turn the ignition off.
2. Disconnect the High Voltage Battery Pack C3 low voltage harness connector.
3. Using a 12-volt test light connected to ground, check each Fused B(+) circuit in the High Voltage Battery Pack C3 low voltage harness connector.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 3
  No
  - Repair the (A902) Fused B(+) circuit for an open or short.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to BPCM VERIFICATION TEST .
CHECK THE (Z900) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Using a 12-volt test light connected to 12-volts, check the (Z900) Ground circuits in the High Voltage Battery Pack C3 low voltage harness connector.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 4
  No
  - Repair the (Z900) Ground circuit for an open.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to BPCM VERIFICATION TEST .
CHECK THE (D27) AND (D28) CAN C BUS CIRCUITS FOR AN OPEN
1. Turn the ignition off. Remove the key from the Ignition Switch, close the doors and allow the Electric Vehicle Control Unit (EVCU) to shut down.
  NOTE:
  Allow up to two minutes for the EVCU to shut down. Opening the vehicle door will interrupt the shut down process.
2. Disconnect the EVCU C1 harness connector.
3. Measure the resistance of the (D27) CAN C Bus (+) circuit between the EVCU C1 harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
4. Measure the resistance of the (D28) CAN C Bus (-) circuit between the EVCU C1 harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - 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 BPCM VERIFICATION TEST .
  No
  - Repair the (D27) CAN C Bus (+) or (D28) CAN C Bus (-) for an open circuit.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to BPCM VERIFICATION TEST .
PRESSURE TEST THE BATTERY COOLANT SYSTEM
1. Turn the ignition off.
  NOTE:
  The Battery Coolant System Pressure Test requires the running of a diagnostic routine that operates the coolant pump. Trapped air in the coolant system may allow the pump to overspeed and shutdown interrupting the test and setting additional DTCs.
2. Perform the HIGH-VOLTAGE BATTERY COOLANT SYSTEM PRESSURE TEST. Refer to HIGH-VOLTAGE BATTERY COOLING AND HEATING SYSTEM, STANDARD PROCEDURE .
  Does the Battery Coolant System pass the Pressure Test?
  
  Yes
  - Go To 7
  No
  - Go To 6
RETEST THE BATTERY COOLANT SYSTEM
NOTE:
If the pressure test failed or did not complete the diagnostic routine in the previous step, the BPCM may set DTC P0E3B-00 BATTERY COOLANT PUMP OVERSPEED and/or reset this DTC P0C32-00 BATTERY COOLING SYSTEM PERFORMANCE.
1. Repeat the HIGH-VOLTAGE BATTERY COOLANT SYSTEM PRESSURE TEST. Refer to HIGH-VOLTAGE BATTERY COOLING AND HEATING SYSTEM, STANDARD PROCEDURE .
  Does the Battery Coolant System pass the Pressure Test?
  
  Yes
  - Go To 7
  No
  - Locate the source of the coolant leak and repair as necessary.
  - Repeat the HIGH-VOLTAGE BATTERY COOLANT SYSTEM PRESSURE TEST until completed. Refer to HIGH-VOLTAGE BATTERY COOLING AND HEATING SYSTEM, STANDARD PROCEDURE .
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to BPCM VERIFICATION TEST .
ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase BPCM DTCs.
3. Turn the ignition off. Wait ten minutes.
4. Turn the ignition on. Wait ten minutes.
5. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - 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 BPCM VERIFICATION TEST .
  No
  - Test complete.