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Home >> Jeep >> 2022 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (3.0L Diesel - DTCS P0219-00 To P0273-00) >> DTC Troubleshooting >> P0268-00-Fuel Injector 3 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  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, 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 75.0 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 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK FOR OTHER DTCS 
    NOTE:

    An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set.

    1. Check the PCM for other DTCs.

      Are there any other DTCs present.

      Yes 

      • Go To  3

      No 

      • Go To  4
  3. CHECK THE PCM POWERS AND GROUNDS 
    1. Perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test procedure. Refer to CHECKING THE PCM POWER AND GROUND CIRCUITS .

      Were any PCM POWER AND GROUND CIRCUIT issues found?

      Yes 

      • Repair the PCM power and ground circuits in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect all of the Fuel Injector harness connectors.
    3. Disconnect the PCM C2 harness connector.
    4. Remove the ASD Relay from the PDC.
    5. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
    6. Turn the ignition on.
    7. Measure the voltage of each Fuel Injector High Side Control circuit.
    8. Measure the voltage of each Fuel Injector Low Side Control circuit.

      Is the voltage above 1.0 Volt for any of the measurements?

      Yes 

      No 

      • Go To  5
  5. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Remove the jumper wire and install the ASD Relay.
    3. Check for continuity between ground and each Fuel Injector High Side Control circuit.
    4. Check for continuity between ground and each Fuel Injector Low Side Control circuit.

      Is there continuity between ground and any of the Fuel Injector Control circuits?

      Yes 

      • Repair the Fuel Injector Control circuit that showed continuity for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK FOR FUEL INJECTOR CIRCUITS SHORTED TOGETHER 
    1. Check for continuity between each of the Fuel Injector High Side Control circuits and the Fuel Injector Low-Side Control circuits.

      Is there continuity between any of the Fuel Injector High Side Control circuits and the Fuel Injector Low-Side Control circuits?

      Yes 

      No 

      • Go To  7
  7. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of each Fuel Injector High Side and Low Side Control circuits between its respective injector harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms for each measurement?

      Yes 

      • Go To  8

      No 

      • Repair the Fuel Injector Control circuit that measured above 3.0 Ohms for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  8. CHECK THE FUEL INJECTORS FOR AN INTERNAL SHORT TO GROUND 
    1. Check for continuity between ground and either terminal of each Fuel Injector.

      Is there continuity between ground and either terminal of each Fuel Injector?

      Yes 

      No 

      • Go To  9
  9. CHECK THE RESISTANCE OF THE FUEL INJECTORS 
    1. Measure the resistance of each Fuel Injector (measure across both terminals of the injector).
      NOTE:

      Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohms of resistance when measured through it.

      Is the resistance below 1.0 Ohm for each Fuel Injector?

      Yes 

      • Go To  10

      No 

  10. CHECK FOR MULTIPLE FUEL INJECTOR DTCS 

    Were there multiple Fuel Injector DTCs set in the PCM?

    Yes 

    • Go To  11

    No 

  11. CHECK FOR ONE FUEL INJECTOR CAUSING MULTIPLE FUEL INJECTOR FAULTS 
    1. Reconnect all harness connectors.
    2. Turn the ignition on.
    3. With the scan tool, erase all PCM DTCs.
    4. Disconnect the Fuel Injector 3 harness connector.
    5. With the scan tool, read the PCM DTCs.
      NOTE:

      The continued setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults.

      NOTE:

      If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults.

      Choose the correct result below.

      The PCM set Multiple Injector DTCs 

      • Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      The PCM set only a DTC for the disconnected Injector 

      • Replace the Fuel Injector that was disconnected in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
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