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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 >> P24BB EVAP System Leak Detection Pump Pressure Sensor Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Diagnose and repair any system voltage or 5-Volt Supply voltage DTCs before continuing with this test.

    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K104) ELCM PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the ELCM harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K104) ELCM Pressure Sensor Signal circuit at the ELCM harness connector.

      Is the voltage reading above 5.2 volts?

      Yes 

      • Repair the (K104) ELCM Pressure Sensor Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR THE (K104) FTP SENSOR SIGNAL CIRCUIT SHORTED TO THE (N8) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Check for continuity between the (K104) ELCM Pressure Sensor Signal circuit and the (N8) 5-Volt Supply circuit at the ELCM harness connector.

      Is there continuity between the (K104) ELCM Pressure Sensor Signal circuit and the (N8) 5-Volt Supply circuit?

      Yes 

      • Repair the short between the (K104) ELCM Pressure Sensor Signal circuit and the (N8) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K104) ELCM PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    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.

    1. 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.

    2. Measure the resistance of the (K104) ELCM Pressure Sensor Signal circuit between the ELCM harness connector and the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K104) ELCM Pressure Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (N10) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N10) Sensor Ground circuit between the ELCM harness connector and the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (N10) Sensor ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE ABILITY OF THE PCM TO READ THE ELCM PRESSURE SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the PCM C1 harness connector.
    3. Connect a jumper between the (K104) ELCM Pressure Sensor Signal circuit and the (N10) Sensor Ground circuit at the ELCM harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read DTCs.
      NOTE:

      The scan tool should display the P24BA EVAP SYSTEM LEAK DETECTION PUMP PRESSURE CIRCUIT LOW DTC as active or pending with the jumper in place.

      Does the scan tool display as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the ELCM and Powertrain Control Module connectors. Replace the ELCM if no problems were found with the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  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 .
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