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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 33 (3.0L Diesel - DTCS P26A3-00 To U0121-00) >> DTC Troubleshooting >> P26A6-00-Engine Coolant Bypass Valve 1 Position Sensor Circuit Low >> 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 THE ABILITY OF THE PCM TO READ THE COOLANT THREE WAY VALVE POSITION SIGNAL 
    1. Turn the ignition off.
    2. Disconnect the Coolant Three Way Valve harness connector.
    3. Turn the ignition on, engine not running.
    4. With the scan tool, read DTCs.
      NOTE:

      The scan tool should display a P26A7-ENGINE COOLANT BYPASS VALVE POSITION SENSOR CIRCUIT HIGH DTC as active or pending with the harness connector disconnected.

      Does the P26A7-ENGINE COOLANT BYPASS VALVE POSITION SENSOR CIRCUIT HIGH DTC set as active or pending with the harness connector unplugged?

      Yes 

      • Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors. Replace the Coolant Three Way Valve if no problems were found in the connector. After the Coolant Three Way Valve is replaced, navigate to Misc Functions, and select the Coolant Three Way Valve Replaced selection to clear the Coolant Three Way Valve actuation counter.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE COOLANT THREE WAY VALVE (K473) SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the Coolant Three Way Valve (K473) Signal circuit at the Coolant Three Way Valve harness connector.

      Is there continuity between ground and the Coolant Three Way Valve (K473) Signal circuit?

      Yes 

      No 

      • Go To  4
  4. CHECK FOR THE COOLANT THREE WAY VALVE (K473) SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the Coolant Three Way Valve (K473) Signal circuit and the (K900) Sensor Ground circuit at the Coolant Three Way Valve harness connector.

      Is there continuity between the Coolant Three Way Valve (K473) Signal circuit and the (K900) Sensor Ground circuit?

      Yes 

      • Repair the short between the Coolant Three Way Valve Position (K473) Signal circuit and the (K900) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. 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.

    5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

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