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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Communication - Non-DTC Based Diagnostics - 500 - Except Electric) >> Diagnosis And Testing >> No Response From EPS (Electric Power Steering) Module >> Diagnostic Test

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.
  1. TEST FOR INTERMITTENT CONDITION 
    NOTE:

    Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

    1. Turn the ignition on.
      NOTE:

      Make sure the battery voltage is between 10.0 and 16.0 volts.

    2. With the scan tool, read the module status.
      NOTE:

      Check the BCM for any active CAN hardware DTCs, perform DTC before proceeding.

      Does the scan tool indicate that the module is active on the bus?

      Yes 

      • The no response condition is not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  2
  2. CHECK THE FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT 
    1. Turn the ignition off.
    2. Disconnect the EPS Assembly C1 harness connector.
    3. Using a 12-volt test light connected to ground, check the Fused B(+) circuit.

      Does the test light illuminate brightly?

      Yes 

      • Go To  3

      No 

      • Repair the open or short in the Fused B(+) circuit.
      • Perform the EPS Verification Test. Refer to STANDARD PROCEDURE .
  3. CHECK THE GROUND CIRCUIT FOR AN OPEN 
    1. Using a 12-volt test light connected to 12-volts, check the Ground circuit.

      Does the test light illuminate brightly?

      Yes 

      • Go To  4

      No 

      • Repair the open in the Ground circuit.
      • Perform the EPS Verification Test. Refer to STANDARD PROCEDURE .
  4. CHECK THE CAN C BUS CIRCUITS FOR AN OPEN 
    1. Disconnect the EPS Assembly C2 harness connector.
    2. Disconnect the BCM harness connector.
    3. Measure the resistance of the CAN C Bus (+) circuit between the BCM harness connector and the EPS Assembly C2 harness connector.
    4. Measure the resistance of the CAN C Bus (-) circuit between the BCM harness connector and the EPS Assembly C2 harness connector.

      Are the resistances below 5.0 Ohms?

      Yes 

      • Replace the Electronic Power Steering (EPS) Assembly in accordance with service information. Refer to COLUMN, REMOVAL .
      • Perform the EPS Verification Test. Refer to STANDARD PROCEDURE .

      No 

      • Repair the open in the CAN C Bus (+) or CAN C Bus (-) circuit.
      • Perform the EPS Verification Test. Refer to STANDARD PROCEDURE .
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