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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (3.2L - DTCS B104D To P0123) >> DTC Troubleshooting >> P0123-Throttle Position Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    If P2101 is also set, make sure that the blade moves freely and does not hang up near Wide Open Throttle before trying to repair P0123.

    1. Start the engine and allow it to idle.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    2. With the scan tool, read DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

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

      Are there any system voltage or 5-Volt Reference DTCs active or pending?

      Yes 

      No 

      • Go To  3
  3. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between ground and the (K22) TPS 1 Signal circuit at the Throttle Body harness connector.

      Is the voltage reading above 5.2 volts?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
      CAUTION:

      Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    4. Measure the resistance of the (K22) TPS 1 Signal circuit from the Throttle Body harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

  5. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Check for continuity between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.

      Is there continuity between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply circuit?

      No 

      • Go To  6

      Yes 

      • Repair the short between the (F855) 5-Volt Supply circuit and the (K22) TPS 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  6. CHECK THE (K922) TPS RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K922) TPS Return circuit from the Throttle Body harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

  7. CHECK THE ABILITY OF THE PCM TO READ THE THROTTLE POSITION SENSOR SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the PCM C2 harness connector.
    3. Turn the ignition on, engine not running.
    4. Connect a jumper between the (K22) TPS 1 Signal circuit and the (K922) TPS Return circuit at the Throttle Body harness connector.
    5. With the scan tool, read DTCs.
      NOTE:

      The scan tool should display a P0122-THROTTLE POSITION SENSOR 1 CIRCUIT LOW DTC as active or pending with the jumper in place.

      Does the scan tool display the DTC as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If no problems are found, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Refer to THROTTLE BODY, REMOVAL, 3.2L .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .

      No 

      • Go To  8
  8. 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 

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