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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS B2277 To P0131, Diagnostic Code Index, Pre-Diagnostic Troubleshooting Procedure & Intermittent Condition >> Diagnosis And Testing >> P0122-Throttle Position Sensor Circuit No.1 Low >> Diagnostic Tests

Diagnostic Tests

  1. 1)   THROTTLE POSITION SENSOR BELOW 0.30 VOLT

    Turn the ignition on.

    With the scan tool, read the Throttle Position Sensor No.1 voltage values.

    Is either voltage reading below 0.30 volt? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  10).
  2. 2)   (F855) 5-VOLT SUPPLY CIRCUIT
    Fig 1: MEASURING VOLTAGE OF THE ETC 5-VOLT SUPPLY CIRCUIT
    GC0041827Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the ETC Assembly harness connector.

    Turn the ignition on.

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

    Is the voltage between 4.8 and 5.2 volts? 

    Yes 

    1. Go To  3).

    No 

    1. Go To  7).
  3. 3)   TP SENSOR INTERNAL FAILURE
    Fig 2: CHECKING TP SENSOR FOR INTERNAL FAILURE
    GC0041828Courtesy of DAIMLERCHRYSLER CORP.

    With the scan tool, monitor TPS No.1 Input voltage.

    Connect a jumper wire between the (F855) 5 Volt-Supply circuit and the (K22) TPS Signal No.1 circuit in the ETC Assembly harness connector.

    Is the voltage for TPS above 4.5 volts with the jumper wire in place? 

    Yes 

    1. Replace the ETC Assembly.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)   (K22) TPS SIGNAL NO.1 CIRCUIT OPEN
    Fig 3: MEASURING RESISTANCE OF THE TPS SIGNAL NO.1 CIRCUIT
    GC0041831Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connector.

    Measure the resistance of the (K22) TPS Signal No.1 circuit.

    Is the resistance below 5 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open (K22) TPS Signal No.1 circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)   (K22) TP SENSOR SIGNAL NO.1 CIRCUIT SHORTED TO GROUND
    Fig 4: MEASURING RESISTANCE BETWEEN GROUND AND TP SENSOR SIGNAL NO.1 CIRCUIT
    GC0041832Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K22) TP Sensor Signal No.1 circuit in the ETC Assembly harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the (K22) Throttle Position Sensor Signal No.1 circuit for a short to ground.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  6).
  6. 6)   (K22) TP SENSOR SIGNAL NO.1 CIRCUIT SHORTED TO (K922) SENSOR GROUND CIRCUIT
    Fig 5: MEASURING RESISTANCE BETWEEN THE TP SENSOR SIGNAL NO.1 CIRCUIT AND THE SENSOR GROUND CIRCUIT
    GC0041833Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K22) TP Sensor Signal No.1 circuit and the (K922) Sensor Ground circuit in the ETC Assembly harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the (K22) Throttle Position Sensor Signal No.1 circuit for a short to the (K922) Sensor Ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  7).
  7. 7)   (F855) 5-VOLT SUPPLY CIRCUIT OPEN
    Fig 6: MEASURING RESISTANCE OF THE 5-VOLT SUPPLY CIRCUIT
    GC0041829Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (F855) 5-volt Supply circuit.

    Is the resistance below 5 ohms? 

    Yes 

    1. Go To  8).

    No 

    1. Repair the (F855) 5-volt Supply circuit for an open.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  8. 8)   (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
    Fig 7: MEASURING RESISTANCE BETWEEN THE 5-VOLT SUPPLY CIRCUIT AND GROUND
    GC0041830Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (F855) 5-volt Supply circuit and ground.

    Is the resistance below 100 ohms? 

    Yes 

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

    No 

    1. Go To  9).
  9. 9)   PCM
    NOTE: Before Continuing: Disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  10. 10)   THROTTLE POSITION SENSOR SWEEP

    Turn the ignition on.

    With the scan tool, use the ETC System Test to open and close the throttle. Fully open and fully close the throttle several times.

    Monitor the Throttle Position Sensor No.1 Input voltage.

    Is the voltage change smooth as the throttle opens and closes? 

    Yes 

    1. Refer to the INTERMITTENT CONDITION  diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace the ETC Assembly.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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