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.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
  NOTE:
  The PCM tests the Throttle Body Assembly by opening and closing the Throttle Body plate before starting the engine.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE THROTTLE PLATE FOR RESTRICTIONS, OBSTRUCTIONS OR DAMAGE
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 or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick.
4. Inspect for any signs of coking or a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Turn the ignition on and use the scan tool to actuate the Throttle Plate and check for any sticking.
  Were any signs of foreign material or scoring of the Throttle Plate or bore found?
  
  Yes
  - Clean the throttle blade and bore if possible or replace the Throttle Body Assembly in accordance with the Service Information if necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE THROTTLE BODY CONNECTOR FOR DAMAGE OR POOR FIT
1. Disconnect the Throttle Body harness connector.
2. Check the connector for a damaged locking tab and for corroded, pushed out, spread or damaged terminals that can cause an intermittent connection.
  Were any problems found?
  
  Yes
  - Repair the Throttle Body connector or wiring.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Throttle Body Assembly in accordance with the Service Information. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .