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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (2.0L - DTCS P2401 To P24F0) >> DTC Troubleshooting >> P24BD EVAP System Leak Detection Pump Vacuum Switching Valve Control Circuit/Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE CONDITION 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.
    3. Record the related Freeze Frame data.
    4. With the scan tool, erase DTCs.
      NOTE:

      The scan tool test will not run if there are Evaporative System faults present.

    5. With the scan tool, perform the ELCM Forced Monitor test.

      Did the ELCM Forced Monitor test pass or fail?

      Passed 

      Failed 

      • Go To  2
  2. CHECK THE (F344) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Disconnect the ELCM harness connector.
    2. Measure the voltage on the (F344) Fused ASD Relay Output Circuit at the ELCM harness connector.

      Is the voltage equal to Battery voltage?

      Yes 

      • Go To  3

      No 

      • Repair the (F344) Fused ASD Relay Output Circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK THE (K106) ELCM CHANGE-OVER VALVE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
      CAUTION:

      Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.

    3. Connect the special tool # 10436, (GPEC Diagnostic Adapter) to the appropriate PCM connector.
      NOTE:

      The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.

    4. Measure the resistance of the (K106) ELCM Change-Over Valve Control Circuit between the ELCM harness connector and the PCM C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K106) ELCM Change-Over Valve Control Circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK THE ELCM CHANGE-OVER VALVE 
    1. Measure the coil resistance of the ELCM Change-Over Valve at the ELCM (component side).

      Is the resistance between 25.0 and 30.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Replace the Evaporative Leak Check Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. 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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