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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1381 (1.3L - DTCS P0521 To P0780) >> DTC Troubleshooting >> P0645-A/C Control Circuit/Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Renegade. 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 FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any charging system or Battery voltage DTCs present?

      Yes 

      No 

      • Go To  3
  3. CHECK THE A/C CLUTCH RELAY AND PDC FOR PROPER OPERATION 
    1. Turn the ignition on.
    2. Using a 12-volt test light connected to ground back probe the A/C Clutch Relay (C13) Control circuit at the PDC C3 connector.
    3. Using a 12-volt test light connected to ground, probe the A/C Clutch Relay (C3) Output circuit at the PDC Cxx connector to verify the relay is closing when energized. The test light should illuminate when the relay is closed.
      NOTE:

      The relay may also make an audible click when closing.

      Does the A/C Clutch Relay close when the control circuit is grounded?

      Yes 

      • Go To  4

      No 

      • Go To  8
  4. ISOLATE AND CHECK THE A/C CLUTCH RELAY (C13) CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT AT THE PCM HARNESS CONNECTOR 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Disconnect the PDC C3 harness connector.
    4. Check for continuity between the A/C Clutch Relay (C13) Control circuit and all other circuits at the PCM C1 harness connector.

      Is there continuity between the A/C Clutch Relay (C13) Control circuit and any other circuit?

      Yes 

      • Repair the short to the circuit that showed continuity. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE A/C CLUTCH RELAY (C13) CONTROL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the A/C Clutch Relay (C13) Control circuit at the PCM C1 harness connector.

      Is there continuity between ground and the A/C Clutch Relay (C13) Control circuit?

      Yes 

      • Repair the A/C Clutch Relay (C13) Control circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE A/C CLUTCH RELAY (C13) CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the A/C Clutch Relay (C13) Control circuit between the PDC C3 harness connector and the PCM C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the A/C Clutch Relay (C13) Control circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. 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 .
  8. CHECK THE A/C CLUTCH RELAY COIL VOLTAGE SUPPLY AT THE A/C CLUTCH RELAY CONNECTOR IN THE PDC 
    1. Turn the ignition off.
    2. Remove the A/C Clutch Relay from the PDC.
    3. Turn the ignition on.
    4. Measure the voltage at (supply) terminal 85/86 of the relay connector in the PDC.
      NOTE:

      If the voltage supply is coming from the output of another relay, verify that the other relay is energized.

      Does the terminal have Battery voltage present?

      Yes 

      • Go To  9

      No 

      • Go To  10
  9. CHECK THE A/C CLUTCH RELAY CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE IN THE PDC 
    1. Disconnect the PDC C1 Connector. If the PDC is hard-wired directly to the harness, disconnect the appropriate PCM harness connector and back probe the relay control circuit.
    2. Measure the resistance of the A/C Clutch Relay Control circuit between terminal 85/86 of the relay connector in the PDC and the correct terminal of the PDC C1 connector (component side).

      Is the resistance below 3.0 Ohms?

      Yes 

      • Replace the A/C Clutch Relay in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the Power Distribution Center (PDC) in accordance with Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  10. CHECK THE BATTERY SUPPLY VOLTAGE TO THE PDC 
    1. Using the wiring information as a guide, measure the main Battery voltage supply at the PDC terminal.

      Is Battery voltage present?

      Yes 

      • Check all fuses in the PDC. If a fuse is found to be open, replace the fuse and retest. If no problems are found with the fuses, replace the PDC in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Repair the Battery voltage supply to the PDC for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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