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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 159 (3.6L - DTCS P000A To P0157) >> DTC Troubleshooting >> P0122-Throttle Position Sensor 1 Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) 
    NOTE:

    Diagnose and repair any Throttle Body circuit, system voltage or sensor supply voltage DTCs before continuing with this test.

    1. Start the engine and allow it to reach operating temperature.
      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 the active DTCs.
      NOTE:

      If the DTC does not reset it may be necessary to test drive the vehicle.

      NOTE:

      If the P2122-APP Sensor 1 Circuit Low DTC is also Active, diagnose the P2122 before continuing with the P0122 diagnostic procedure.

      Is the DTC Active at this time?

      Yes 

      • Go To  2

      No 

      • Go To  11
  2. P0222 ALSO SET 

    Was the P0222-TP SENSOR NO. 2 VOLTAGE LOW DTC set along with the P0122?

    Yes 

    • Go To  3

    No 

    • Go To  4
  3. (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Measuring Voltage On 5-Volt Supply Circuit In Throttle Body Harness Connector
    GC0150101Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Ignition on, engine not running.
    4. Measure the voltage on the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.

      Is the voltage between 4.8 to 5.2 Volts?

      Yes 

      • Go To  4

      No 

      • Go To  8
  4. THROTTLE POSITION SENSOR 
    1. With the scan tool, monitor the TP Sensor No. 1 voltage with the Sensor harness connector disconnected.
      NOTE:

      The sensor voltage should be approximately 5.0 Volts (plus or minus.1 volt) with the connector disconnected.

      Does the scan tool display the voltage as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, 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 .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  5
  5. (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking TP Sensor Signal Circuit For Short To Ground
    GC0150102Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit in the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  6
  6. (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K922) TP SENSOR RETURN CIRCUIT 
    Fig 3: Checking TP Sensor No. 1 Signal Circuit For Short To TP Sensor Return Circuit
    GC0150103Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short between the (K922) TP Sensor Return circuit and the (K22) TP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  7
  7. EXCESSIVE RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT 
    Fig 4: Checking TP Sensor No. 1 Signal Circuit For An Open
    GC0150104Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit between the Throttle Body harness connector to the PCM C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  10

      No 

      • Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
  8. (F855) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 5: Measuring Resistance Of 5-Volt Supply Circuit From Throttle Body Harness Connector To PCM C2 Harness Connector
    GC0150105Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (F855) 5-Volt Supply circuit from the Throttle Body harness connector to the PCM C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  9

      No 

  9. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 6: Measuring Resistance Between Ground & 5-Volt Supply Circuit In Throttle Body Harness Connector
    GC0150106Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short to ground in the (F855) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  10
  10. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

  11. THROTTLE FOLLOWER TEST 
    1. With the scan tool, perform the ETC Throttle Follower Test.
    2. Monitor the TP Sensor No. 1 voltage.

      Does the voltage start at approximately 0.7 Volt and increase to approximately 4.3 Volts with a smooth transition?

      Yes 

      No 

      • Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, 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 .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
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