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Home >> Jeep >> 2024 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (3.0L - DTCS P26F0-00 To P2AF3-00) >> DTC Troubleshooting >> P2AF2-00-Starter Relay 3 Control Circuit-Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK FUSE F13 (40A) AND F85 (10A) IN THE POWER DISTRIBUTION CENTER 
    1. Check Fuse F13 and F85 in the Power Distribution Center for continuity.

      Is the Fuse open?

      Yes 

      • Replace the open fuse and check the related wiring harnesses for any conditions that could cause the open fuse.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. ISOLATE AND CHECK THE STARTER RELAY (T760) OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the PCM connector and measure the resistance of the circuit.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

  4. CHECK THE STARTER RELAY AND PDC FOR PROPER OPERATION 
    1. Using a 12-volt test light connected to ground, back probe the Starter Relay (K88) Control circuit at the PDC C1 connector.
      NOTE:

      The relay should make an audible click when closing.

    2. Check for voltage on the PCR Control Relay (T762) Output circuit at the PDC C1 connector to determine if the relay is closing if a click is not heard.

      Does the Starter Relay close when the control circuit is connected to ground?

      Yes 

      • Go To  5

      No 

      • Replace the PDC in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE PCR CONTROL RELAY AND PDC FOR PROPER OPERATION 
    NOTE:

    The Starter Relay (K88) Control will need to be back probed for voltage to be present when performing this test.

    1. Using a 12-volt test light connected to ground, back probe the PCR Control Relay (T762) Control circuit at the PDC C1 connector.
      NOTE:

      The relay should make an audible click when closing.

    2. Check for voltage on the Starter Relay (T760) Output circuit at the PDC C1 connector to determine if the relay is closing if a click is not heard.

      Does the Starter Relay close when the control circuit is connected to ground?

      Yes 

      • Go To  6

      No 

      • Replace the PDC in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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