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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Electric Vehicle Control Unit (EVCU) Module - DTCS B12A4-11 To P1138-00 - 500 - Electric) >> DTC Troubleshooting >> P08AF-00-Neutral Switch 2 Circuit Low >> 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.
Typical ePRND Switch Voltages
Switch Button Not Pressed - Typical Voltage Button Not Pressed - Minimum Voltage Button Not Pressed - Maximum Voltage Button Pressed - Typical Voltage Button Pressed - Minimum Voltage Button Pressed - Maximum Voltage
Park Low Side Switch (1) 1.71 1.00 2.10 3.45 3.00 4.10
Park High Side Switch (2) 3.37 3.00 4.10 1.30 1.00 2.10
Reverse Low Side Switch (1) 1.71 1.00 2.10 3.45 3.00 4.10
Reverse High Side Switch (2) 3.37 3.00 4.10 1.30 1.00 2.10
Neutral Low Side Switch (1) 1.71 1.00 2.10 3.45 3.00 4.10
Neutral High Side Switch (2) 3.37 3.00 4.10 1.30 1.00 2.10
Drive Low Side Switch (1) 1.71 1.00 2.10 3.45 3.00 4.10
Drive High Side Switch (2) 3.37 3.00 4.10 1.30 1.00 2.10
NOTE:

Holding any button pressed longer than 10 seconds will set a DTC for button stuck.



  1. CHECK FOR MULTIPLE DTCS 
    1. Turn the Ignition on, Vehicle in ready mode.
    2. With the scan tool check for active DTCs.

      Were PIM DTC's B22AA-00, P0A8D-00 and EVCU DTC P0A8F-00 found in combination?

      Yes 

      Check TSB for EVCU or PIM s/w Flash update and Flash appropriate Module in accordance to the service information.

      No 

      • Go To  2
  2. CHECK IF DTC IS CURRENT 
    1. Using the scan tool, read EVCU DTCs.
    2. Record the Environmental Data and any DTCs.
    3. Clear DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. Read EVCU DTCs.

      Did the DTC reset?

      Yes 

      • Go To  3

      No 

  3. CHECK THE NEUTRAL HIGH SIDE SWITCH (2) OPERATION 
    1. Using the scan tool, and the ePRND Typical Switch Voltage table, operate the Neutral Switch and note the voltage for Not Pressed and Pressed.

      Is the Neutral High Side Switch (2) lower than the voltage listed in the table for either switch position?

      Yes 

      • Go To  4

      No 

      • Using the schematics as a guide, check the Electric Vehicle Control Unit (EVCU) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the EVCU in accordance with the Service Information. Refer to UNIT, ELECTRIC VEHICLE CONTROL (EVCU), REMOVAL .
      • Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .
  4. CHECK THE (T825) NEUTRAL HIGH SIDE SWITCH (2) FOR AN OPEN 
    1. Turn the ignition off. Remove the key from the Ignition Switch, close doors and allow the 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. Disconnect the ePRND harness connector.
    4. Measure the resistance of the (T825) Neutral High Side Switch (2) circuit between the appropriate terminal of the EVCU C1 harness connector and the ePRND harness connector.

      Is the resistance of the (T825) Neutral High Side Switch (2) circuit above 5.0 Ohms?

      Yes 

      • Repair the (T825) Neutral High Side Switch (2) circuit for an open.
      • Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (T825) NEUTRAL HIGH SIDE SWITCH (2) FOR A SHORT TO GROUND 
    1. Measure the resistance of the (T825) Neutral High Side Switch (2) circuit between ground and the appropriate terminal of the EVCU C1 harness connector.

      Is the resistance below 100k Ohms?

      Yes 

      • Repair the (T825) Neutral High Side Switch (2) circuit for a short to ground.
      • Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .

      No 

      • Using the schematics as a guide, check the ePRND pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the ePRND in accordance with the Service Information.
      • Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .
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