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Home >> Jeep >> 2008 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0203 To P0420 >> P0222-Throttle Position Sensor 2 Circuit Low >> Diagnostic Test

Diagnostic Test

  1. ACTIVE DTC 
    NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.
    NOTE: If a 5-Volt supply DTC has also set, diagnose the 5-Volt DTC before continuing.
    NOTE: Make sure the throttle moves freely and does not hang up at Wide Open Throttle, by performing the Throttle Follower Test
    NOTE: If P2101 is also set, then make sure that the blade moves freely and does not hang up near Wide Open Throttle before trying to repair P0222.

    Ignition on, engine not running.

    With the scan tool, select View DTCs.

    Is the DTC Active at this time? 

    Yes 

    1. Go To  2.

    No 

    1. Go To  11.
  2. P0122 ALSO SET 

    Was the P0122-TP SENSOR NO.1 VOLTAGE LOW DTC set along with the P0222? 

    Yes 

    1. Go To  3.

    No 

    1. Go To  4.
  3. (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Checking 5-Volt Sensor Circuit For Open Or Short
    GC0056781Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Throttle Body harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle Body harness connector.

    Is the voltage between 4.5 to 5.2 volts? 

    Yes 

    1. Go To  4.

    No 

    1. Go To  8.
  4. THROTTLE POSITION SENSOR 
    Fig 2: Checking Throttle Body Connector
    GC0056782Courtesy of CHRYSLER LLC

    Connect a jumper wire between the (F855) 5-volt Supply circuit and the (K122) TP Signal 2 circuit in the Throttle Body harness connector.

    With the scan tool, monitor the TP Sensor No.2 voltage.

    NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the jumper wire in place.

    Does the scan tool display the voltage as described above? 

    Yes 

    1. 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.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  5.
      NOTE: Remove the jumper wire before continuing.
  5. (K122) TP SIGNAL 2 CIRCUIT OPEN 
    Fig 3: Checking For Excessive Resistance In TP Sensor No. 2 Signal Circuit
    GC0056783Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 PCM 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 Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (K122) TP Signal 2 circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  6.

    No 

    1. Repair the open in the (K122) TP Signal 2 circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO GROUND 
    Fig 4: Checking TP Sensor No. 2 Signal Circuit For Short To Ground
    GC0056784Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (K122) TP Signal 2 circuit at the Throttle Body harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K122) TP Signal 2.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  7.
  7. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (K922) TP SENSOR GROUND CIRCUIT 
    Fig 5: Checking TP Sensor No. 2 Signal Circuit For Short To TP Sensor Return Circuit
    GC0056785Courtesy of CHRYSLER LLC

    Measure the resistance between the (K122) TP Signal 2 circuit and the (K922) TP Sensor Ground circuit at the Throttle Body harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short between the (K922) TP Sensor Ground circuit and the (K122) TP Signal 2 circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  10.
  8. (F855) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 6: Checking 5-volt Supply Circuit For Open
    GC0056786Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 PCM 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 Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  9.

    No 

    1. Repair the open in the (F855) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  9. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 7: Checking 5-volt Supply Circuit For Short To Ground
    GC0056787Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (F855) 5-volt Supply circuit at the Throttle Body harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F855) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  10.
  10. POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).

    Look for any chafed, pierced, pinched, or partially broken wires.

    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.

    Refer to any Technical Service Bulletins that may apply.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module per Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
  11. THROTTLE FOLLOWER TEST 

    Ignition on, engine not running.

    With the scan tool, perform the ETC Throttle Follower Test.

    Monitor the TP Sensor No.2 voltage while slowly pressing the Throttle pedal down.

    Is there a smooth voltage change from approximately 4.3 volts and decrease to approximately 0.7 of a volt? 

    Yes 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

    No 

    1. 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.
    2. Perform POWERTRAIN VERIFICATION TEST .
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