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Home >> Jeep >> 2018 >> Grand Cherokee Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (3.0L Diesel - DTCS P2201-00 To P24F2-00) >> DTC Troubleshooting >> P242D-00-Exhaust Gas Temperature Sensor Circuit High - Bank1 Sensor 3 >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, record all Freeze frame data.
    3. With the scan tool, erase DTCs.
    4. Turn the ignition off for 75 seconds.
    5. Turn the ignition on.
    6. With the scan tool, read DTCs.

      Did the DTC reset?

      Yes 

      • Go To  2

      No 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK THE (K386) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Exhaust Gas Temperature Sensor 1/3 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K386) Exhaust Gas Temperature Sensor 1/3 Signal circuit at the Exhaust Gas Temperature Sensor 1/3 harness connector.

      Is the voltage reading above 5.2 volts?

      Yes 

      • Repair the (K386) Exhaust Gas Temperature Sensor 1/3 Signal circuit for a short to voltage. Reset the SCR Timer: Using the scan tool, Go to Misc. Functions> SCR Extend Mileage W Active Fault (and reset the Timer).
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K186) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    2. Turn the ignition off.
    3. Disconnect the PCM C2 harness connector.
    4. Measure the resistance of the (K386) Exhaust Gas Temperature Sensor 1/3 Signal circuit between the Exhaust Gas Temperature Sensor 1/3 harness connector and the PCM C2 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (K386) Exhaust Gas Temperature Sensor 1/3 Signal circuit for an open or high resistance. Reset the SCR Timer: Using the scan tool, Go to Misc. Functions> SCR Extend Mileage W Active Fault (and reset the Timer).
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K388) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K388) Sensor ground circuit between the Exhaust Gas Temperature Sensor 1/3 harness connector and the PCM C2 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (K388) Sensor ground circuit for an open or high resistance. Reset the SCR Timer: Using the scan tool, Go to Misc. Functions> SCR Extend Mileage W Active Fault (and reset the Timer).
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  5
  5. INSTALL A NEW EXHAUST GAS TEMPERATURE SENSOR 1/3 
    1. Install a new Exhaust Gas Temperature Sensor 1/3 in accordance with the service information. Refer to SENSOR, EXHAUST TEMPERATURE, REMOVAL .
    2. Turn the ignition on.
    3. With the scan tool, erase PCM DTCs.
    4. Perform several ignition key cycles leaving the ignition on for at least 10 seconds per cycle.
    5. Start the engine and let it run for two minutes.
    6. With the scan tool, read PCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  6

      No 

      • Test complete. Reset the SCR Timer: Using the scan tool, Go to Misc. Functions> SCR Extend Mileage W Active Fault (and reset the Timer).
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  6. 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 

      No 

      • Repair the poor connections.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
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