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Home >> Jeep >> 2024 >> Grand Cherokee Summit >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 74 (2.0L - DTCS P04EC To P051D) >> DTC Troubleshooting >> P050B-Cold Start Ignition Timing Performance >> Diagnostic Test

Diagnostic Test

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  1. CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES 
    1. Check for any applicable Service Bulletins or Flash updates related to the DTC.

      Are there any applicable Service Bulletins or Flash updates?

      Yes 

      No 

      • Go To  2
  2. 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  3

      No 

  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any Fuel system, Air Handling, or Throttle Body DTCs present?

      Yes 

      No 

      • Go To  4
  4. CHECK THE BATTERY FOR PROPER OPERATION 
    NOTE:

    Low Battery voltage can also cause excessive current draw in very hot and cold ambient temperatures. Make sure the battery can pass a load test before continuing.

    1. Use the (special tool #GR8-1220KIT-CHRY, AGM Battery Tester/Charger Station)
      GC0214656Courtesy of CHRYSLER GROUP, LLC

      Does the Battery pass the load test?

      Yes 

      • Go To  5

      No 

  5. INSPECT THE THROTTLE BODY PLATE FOR STICKING CONDITION FROM ICE, DEBRIS OR CARBON BUILDUP 
    1. Turn the ignition off.
    2. Remove the Air Cleaner Assembly from the Throttle Body.
    3. Check for any signs of a foreign material (ice, dirt, or excessive carbon build up) on the Throttle Plate or in the bore causing the Throttle Plate to stick.

      Were any signs of foreign material or scoring of the throttle plate or bore found?

      Yes 

      • Remove the debris if possible or replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. INSPECT THE AIR FILTER 
    1. Remove and inspect the Air Filter.

      Is the Air Filter dirty?

      Yes 

      No 

      • Go To  7
  7. CHECK FOR CONTAMINATED OR PROPER ETHANOL LEVEL IN THE GASOLINE 
    1. Inspect the Fuel for contamination. (Dirt, water, or other foreign material).
    2. Inspect the Fuel for proper ethanol level in the gasoline. Refer to CHECKING FOR PROPER ETHANOL LEVEL IN THE GASOLINE .

      Is the fuel contaminated or improper ethanol level?

      Yes 

      • Drain the Fuel from the fuel tank into an approved gas holding tank and add clean fuel. Refer to DRAINING FUEL TANK .

      No 

      • Go To  8
  8. REPLACE THE THROTTLE BODY AND RETEST FOR DTCS 
    1. Turn the ignition off.
    2. Replace the component in accordance with the Service Information. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION .
      NOTE:

      Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.

    3. Connect the component and Electronic Control Unit (ECU) harness connectors.
    4. Turn the ignition on.
    5. With the scan tool, erase all DTCs.
    6. Turn the ignition off for a minimum of 10.0 seconds.
    7. Turn the ignition on.
    8. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    9. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  9

      No 

  9. 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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