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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Body Control Module (BCM) - DTCS B226A-00 To U1493-00 - 500 - Electric) >> DTC Troubleshooting >> U0002-88-Can C Bus Off Performance - Bus Off >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK THE BCM FOR CORRECT OPERATION 
    NOTE:

    With a scan tool, refer to the Network Review screen to aid in identifying vehicle communication problems. The screen depicts a high level view of the vehicle network and any controllers reporting communication problems will appear in red.The CAN C Bus modules are connected in series, to follow the order, refer to the topology listed on the scan tool. Disconnecting a module will remove that module and all the modules downstream of that module from the CAN C bus which will prevent scan tool communication with those modules.

    1. Turn the ignition off.
    2. Disconnect the BCM C1 harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read Body Control Module (BCM) DTCs.

      Does the scan tool display This DTC as stored?

      Yes 

      • Go To  2

      No 

      • Verify the correct operation of the scan tool being used.
      • Using the wiring diagrams as a guide, check all the related connections between the scan tool, Data Link Connector (DLC), and Body Control Module (BCM). Repair as necessary.
      • If the above conditions are correct, replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE CAN C BUS (+) CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Measure the resistance between ground and the CAN C Bus (+) circuit at the BCM C1 harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the short to ground in the CAN C Bus (+) circuit. Use the module connectors to isolate portions of the bus to assist in determining the location of the concern. Repair the circuit concern or replace the module that when disconnected allowed the bus voltage to return to normal. Only replace a module after all harness concerns between the modules are diagnosed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. CHECK THE CAN C BUS (-) CIRCUIT FOR A SHORT TO GROUND 
    1. Measure the resistance between ground and the CAN C Bus (-) circuit at the BCM C1 harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the short to ground in the CAN C Bus (-) circuit. Use the module connectors to isolate portions of the bus to assist in determining the location of the concern. Repair the circuit concern or replace the module that when disconnected allowed the bus voltage to return to normal. Only replace a module after all harness concerns between the modules are diagnosed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK THE CAN C BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage of the CAN C Bus (+) circuit at the BCM C1 harness connector.

      Is voltage present?

      Yes 

      • Repair the short to voltage on the CAN C Bus (+) circuit. Use the module connectors to isolate portions of the bus to assist in determining the location of the concern. Repair the circuit concern or replace the module that when disconnected allowed the bus voltage to return to zero. Only replace a module after all harness concerns between the modules are diagnosed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE CAN C BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage of the CAN C Bus (-) circuit at the BCM C1 harness connector.

      Is voltage present?

      Yes 

      • Repair the short to voltage on the CAN C Bus (-) circuit. Use the module connectors to isolate portions of the bus to assist in determining the location of the concern. Repair the circuit concern or replace the module that when disconnected allowed the bus voltage to return to zero. Only replace a module after all harness concerns between the modules are diagnosed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Test complete.
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