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Home >> Fiat >> 2014 >> 500e >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Battery Pack Control Module (BPCM) - P0C77-00 To U1488-00 - 500E >> Diagnosis And Testing >> U1488-00-Implausible Data Received From Electric Vehicle Control Unit >> Diagnostic Test

Diagnostic Test

  1. 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.
    5. With the 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 .
  2. 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 

      • Go To  3

      No 

      • Repair the open in the (D27) CAN C Bus (+) or (D28) CAN C Bus (-) circuit.
      • Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  3. CHECK THE (D27) AND (D28) CAN C BUS CIRCUITS FOR A SHORT TO GROUND 
    1. Measure the resistance of the (D27) CAN C Bus (+) circuit between a good chassis ground and the High Voltage Battery Pack C3 low voltage harness connector.
    2. Measure the resistance of the (D28) CAN C Bus (-) circuit between a good chassis ground and the High Voltage Battery Pack C3 low voltage harness connector.

      Are the resistances above 10k Ohms?

      Yes 

      No 

      • Repair the short to ground in the (D27) CAN C Bus (+) or (D28) CAN C Bus (-) circuit.
      • Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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