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Home >> Fiat >> 2014 >> 500c Abarth >> Repair and Diagnosis >> External Pages >> Different car >> Section 50 (Battery Pack Control Module (BPCM) - P0C77-00 To U1488-00 - 500E) >> Diagnosis And Testing >> P0C78-00-Hybrid/EV Battery System PRECHARGE Time Too Long >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 Fiat 500e. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THE PIM INTERNAL CAPACITOR 
    Fig 1: High-Voltage Power Distribution Center (PDC) Test Points
    GC0157804Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off. Wait ten minutes.
    2. Disconnect the C3 high voltage harness connector from the Electric Air Compressor (EAC).
    3. Unlock and disconnect the C1 high voltage harness connector from the High Voltage Battery Pack (HVBP). Inspect the high voltage cable connector for broken, bent, corroded, burnt or damaged terminals.
    4. Disconnect the C2 high voltage harness connector from the High Voltage Power Distribution Center (HVPDC).
    5. Remove the three high-voltage power distribution center (PDC) box cover screws and remove the PDC box cover.
    6. Using a Fluke 1587 M? multi-meter or equivalent, insert the appropriate multi-meter test leads into the positive (red) test point (2), and the negative (black) test point (1) in the high-voltage PDC and measure the capacitance.

      Does the capacitance measure 420 μF ± 20% (336 - 504μF)?

      Yes 

      • Go To  2

      No 

  2. CHECK THE PRECHARGE CONTACTOR 
    1. Reconnect the C3 high voltage harness connector to the Electric Air Compressor (EAC).
    2. Reconnect the C2 high voltage harness connector to the High Voltage Power Distribution Center (HVPDC).
    3. Turn the ignition to RUN.
    4. With the scan tool, go to BPCM Misc Functions, Enable/Disable Contactors and DISABLE the high voltage battery contactors.
    5. Turn the ignition off. Wait two minutes.
    6. Unlock and disconnect the On Board Charging Module (OBCM) C2 high voltage harness connector from the High Voltage Battery Pack. Inspect the high voltage cable connector for broken, bent, corroded, burnt or damaged terminals.
    7. Turn the ignition to RUN.
    8. With the scan tool, go to BPCM Misc Functions, Precharge Contactor and CLOSE the Precharge Contactor.
    9. With the scan tool, go to BPCM Data and verify that the Precharge Contactor is Closed.
    10. With the scan tool, go to BPCM Data and read High Voltage Sensor (pack).

      Is the displayed voltage greater than 200 Volts?

      Yes 

      • Go To  3

      No 

  3. HIGH VOLTAGE BATTERY CABLES 
    1. With the scan tool, go to BPCM Misc Functions, Precharge Contactor and OPEN the Precharge Contactor.
    2. With the scan tool, go to BPCM Data and verify that the Precharge Contactor is Open.
    3. Turn the ignition off. Wait two minutes.
    4. Connect and lock the Power Inverter Module (PIM) C1 high voltage harness connector to the High Voltage Battery Pack.
    5. Connect and lock the On Board Charging Module (OBCM) C2 high voltage harness connector to the High Voltage Battery Pack.
    6. Turn the ignition on.
    7. With the scan tool, erase BPCM DTCs.
    8. Turn the ignition off. Wait two minutes.
    9. Turn the ignition on.
    10. With a scan tool, read DTCs.

      Is DTC P0C78-00-HYBRID/EV BATTERY SYSTEM PRECHARGE TIME TOO LONG set as Active?

      Yes 

      • Go To  4

      No 

  4. CHECK THE HIGH VOLTAGE BATTERY CABLE POLARITY AT THE POWER INVERTER MODULE (PIM) 
    NOTE:

    The Positive High-Voltage Battery Cable (OR) should be installed at the forward position on the PIM. The Negative High-Voltage Battery Cable (OR/BK) should be installed at the most rearward position on the PIM.

    1. Turn the ignition off.
    2. Perform the HIGH VOLTAGE POWER DOWN PROCEDURE in accordance with the Service Information. Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE .
    3. Remove the cover from the Power Inverter Module (PIM) in accordance with the Service Information. Refer to MODULE, POWER INVERTER (PIM), REMOVAL .
    4. Inspect the high voltage battery cable connections at the PIM for broken, bent, corroded, burnt or damaged terminals. Verify that the high voltage battery cables are not reversed and installed correctly. Refer to MODULE, POWER INVERTER (PIM), INSTALLATION .

      Are the high voltage battery cables installed correctly and connectors undamaged?

      Yes 

      No 

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