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Home >> Ford >> 2001 >> Focus Street >> Repair and Diagnosis >> External Pages >> Different car >> Section 3017 (Engine Controls - Pinpoint Test A: No Start Through Pinpoint Test DJ: Air Conditioner Evaporator Temperature (ACET) Sensor - (Except Diesel & Hybrid)) >> Pinpoint Test DH: Throttle Position (TP) Sensor >> Test Procedure

Test Procedure

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code Setting Condition Testing
P1120 KOEO, KOER, Continuous Memory  DH3
P1121 KOER, Continuous Memory  DH16
P1124 KOEO, KOER  DH1
P1125 Continuous Memory  DH20
  1. DH1 KOEO AND KOER DTC P1124: CHECK FOR ANY OTHER DTCS 
    • Key in ON position.
    • Check for KOEO and KOER DTCs:

    Are DTCs P1400 or P0405 present? 

    Yes No
    DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS . Key in OFF position.
    GO to  DH2.
  2. DH2 CHECK FOR A STUCK THROTTLE PLATE OR LINKAGE 
    • Visually inspect the throttle linkage and throttle plate for binding or sticking.
    • Verify the throttle plate and linkage is at closed throttle position.

    Does the throttle move freely and return to a closed throttle position? 

    Yes No
    The throttle plate and linkage are OK.
    GO to  DH8.    		 REPAIR as necessary.
  3. DH3 DTC P1120: CHECK THE TP CIRCUIT FOR FRAYED WIRES OR CORROSION ON THE CONNECTORS 
    • Key in OFF position.
    • Carry out a visual inspection of the pins on the harness connector at the TP sensor for corrosion.
    • Carry out a visual inspection of the harness wires between the TP sensor and the PCM for insulation fraying and corrosion.

    Is a fault present? 

    Yes No
    REPAIR as necessary. GO to  DH4.
  4. DH4 CHECK FOR A STUCK TP SENSOR 
    • Key in ON position.
    • Slowly move the throttle from the closed throttle position to the wide open throttle position and observe the TP V PID.
    • Access the PCM and monitor the TP V PID.

    Is the voltage greater than 4.5 V? 

    Yes No
    Key in OFF position.
    GO to  DH20.    		 GO to  DH5.
  5. DH5 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS AT THE TP SENSOR VEHICLE HARNESS CONNECTOR 
    • TP Sensor connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
      (+) TP Sensor Connector, Harness Side (-) TP Sensor Connector, Harness Side
      VREF SIGRTN

    Is the voltage between 4.5 V - 5.5 V? 

    Yes No
    Key in OFF position.
    GO to  DH6.    		 GO to  C1.
  6. DH6 CHECK THE TP CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) TP Sensor Connector, Harness Side
      TP TP

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DH7. REPAIR the open circuit.
  7. DH7 CHECK THE TP SENSOR VOLTAGE TO THE PCM 
    • PCM connector connected.
    • TP Sensor connector connected.
    • Key on engine running.
    • Idle the engine for 2 minutes.
    • Key in ON position.
    • Access the PCM and monitor the TP V PID.
    • Slowly move the throttle from the closed throttle position to the wide open throttle position and observe the TP V PID.

    Is the voltage between 0.17 V - 0.49 V? 

    Yes No
    INSTALL a new TP sensor. If DTC P1120 is still present,
    GO to  DH20.
  8. DH8 DTC P0123 OR DTC P1124: INDUCE THE OPPOSITE TP SENSOR VOLTAGE 
    • TP Sensor connector disconnected.
    • Key in ON position.
    • Access the PCM and monitor the TP V PID.

    Is the voltage less than 0.17 V? 

    Yes No
    GO to  DH9. Key in OFF position.
    GO to  DH10.
  9. DH9 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS AT THE TP SENSOR VEHICLE HARNESS CONNECTOR 
    • Key in ON position.
    • Measure the voltage between:
      (+) TP Sensor Connector, Harness Side (-) TP Sensor Connector, Harness Side
      VREF SIGRTN

    Is the voltage between 4.5 V - 5.5 V? 

    Yes No
    INSTALL a new TP sensor. GO to  C1.
  10. DH10 CHECK THE CIRCUIT FOR A SHORT TO VREF AND VPWR IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) PCM Connector, Harness Side
      VPWR TP
      VREF TP

    Are the resistances greater than 10K ohms? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . REPAIR the short circuit.
  11. DH11 CONTINUOUS MEMORY DTC P0122: CHECK THE TP CIRCUIT FOR AN INTERMITTENT CONCERN 
    • Key in ON position.
    • Clear the PCM DTCs.
    • Key on engine running.
    • Check for continuous memory DTCs:

    Is DTC P0122 present? 

    Yes No
    GO to  DH12. GO to PINPOINT TEST Z STEP 1 .
  12. DH12 KOEO AND KOER DTC P0122: CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS AT THE TP SENSOR VEHICLE HARNESS CONNECTOR 
    • Key in OFF position.
    • TP Sensor connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
      (+) TP Sensor Connector, Harness Side (-) TP Sensor Connector, Harness Side
      VREF SIGRTN

    Is the voltage between 4.5 V - 5.5 V? 

    Yes No
    GO to  DH13. GO to  C1.
  13. DH13 CHECK THE TP CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) TP Sensor Connector, Harness Side
      TP TP

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DH14. REPAIR the open circuit.
  14. DH14 CHECK THE TP CIRCUIT FOR A SHORT TO PWRGND OR SIGRTN IN THE HARNESS 
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) PCM Connector, Harness Side
      TP PWRGND
      TP SIGRTN

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DH15. REPAIR the short circuit.
  15. DH15 INDUCE THE OPPOSITE TP SENSOR VOLTAGE 
    • PCM connector connected.
      NOTE: If a diagnostic tool communication concern exists, immediately remove the jumper and follow the NO path in the RESULT/ACTION column.
    • Connect a 5 amp fused jumper wire between the following:
      Point A TP Sensor Connector, Harness Side Point B TP Sensor Connector, Harness Side
      VREF TP
    • Key in ON position.
    • Access the PCM and monitor the TP V PID.

    Is the voltage greater than 4.65 V? 

    Yes No
    INSTALL a new TP sensor. INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .
  16. DH16 DTC P1121 OR P0068: CHECK THE RATIONALITY OPERATION BETWEEN THE TP AND MAF SENSORS 
    • Attempt to start the engine.

    Does the engine start? 

    Yes No
    GO to  DH17. CHECK for major leaks, cracks and openings between the MAF sensor and the throttle body. If OK,
    GO to  A1.
  17. DH17 CHECK THE TP SENSOR FOR MECHANICAL OPERATION 
    • Key in ON position.
    • Slowly move the throttle from the closed throttle position to the wide open throttle position and observe the TP V PID.
    • Access the PCM and monitor the TP V PID.

    Is the voltage between 0.49 V - 4.65 V? 

    Yes No
    GO to  DH18. INSTALL a new TP sensor.
  18. DH18 CHECK THE TP SENSOR SIGNAL HIGH VERSUS THE ENGINE LOAD WHILE DRIVING THE VEHICLE 
    • Key on engine running.
    • Drive the vehicle, exercising the throttle and TP sensor while accessing the PIDs.
    • Access the PCM and monitor the TP V and LOAD PIDs.

    Is the TP V PID greater than 2.44 volts and the LOAD PID less than 30%? 

    Yes No
    LISTEN for air noise around the MAF sensor and throttle body while the engine is running.
    If OK, INSTALL a new TP sensor.
    GO to PINPOINT TEST HU STEP 1 .    		 GO to  DH19.
  19. DH19 CHECK THE TP SENSOR SIGNAL LOW VERSUS THE ENGINE LOAD WHILE DRIVING THE VEHICLE 
    • Key on engine running.
    • Drive vehicle while exercising the throttle and TP sensor near higher gears (preferably overdrive) while accessing the PIDs.
    • Access the PCM and monitor the TP V and LOAD PIDs.

    Is the TP V PID less than 0.24 volt and the LOAD PID greater than 55%? 

    Yes No
    If Continuous Memory P1121 or P0068 is present, INSTALL a new MAF sensor. Unable to identify the fault at this time.
    GO to PINPOINT TEST Z STEP 1 .
  20. DH20 CMDTCS P1120 OR P1125: CHECK FOR TP CIRCUIT INTERMITTENT SIGNAL 
    • Start engine and allow to idle.
    • Run the throttle up to 1, 500 RPM for 5 seconds.
    • Access the PCM and monitor the TP V PID.
    • Lightly tap on the TP sensor and wiggle the harness connector to simulate road shock.

    Is the voltage between 0.49 V - 4.65 V? 

    Yes No
    Key in OFF position.
    GO to  DH21.    		 INSPECT the TP sensor connector.
    If OK, INSTALL a new TP sensor.
  21. DH21 CHECK THE TP SENSOR HARNESS FOR INTERMITTENT OPENS OR SHORTS 
    • Key in ON position.
    • Access the PCM and monitor the TP V PID.
    • Grasp the vehicle harness closest to the TP sensor connector.
    • Shake and bend a small section of the harness all the way to the bulkhead.
    • Wiggle, shake, and bend the harness from the bulkhead to the PCM.

    Is the voltage between 0.49 V - 4.65 V? 

    Yes No
    Key in OFF position.
    Unable to identify the fault at this time.
    GO to PINPOINT TEST Z STEP 1 .    		 ISOLATE the fault and REPAIR as necessary.
  22. DH22 DTC P0121: CHECK FOR OBSTRUCTION OR STICKING CONCERNS 
    CAUTION: Do not attempt to clean the throttle bore and plate area. Cleaning will damage the throttle body assembly.
    NOTE: Conditions of sticking or obstruction can either be within the cables or throttle body assembly.
    • Disconnect the accelerator cable and speed control cable from the throttle body linkage.
    • Rotate the throttle body linkage.

    Does the throttle body rotate freely without a sticking, binding, or grabbing condition? 

    Yes No
    INSPECT the cable(s). REPAIR as necessary. RERUN the Quick Test. If DTC P0121 is still present,
    GO to  DH23.    		 INSTALL a new throttle body assembly.
  23. DH23 CHECK THE FUNCTIONALITY OF THE THROTTLE POSITION SENSOR 
    • Key in ON position.
    • While slowly pressing the accelerator from the closed throttle position to the wide open throttle position, observe the TP V PID.

    Did the TP V PID display a smooth reading during accelerator movement? 

    Yes No
    VERIFY a symptom no longer exists. INSTALL a new TP sensor.
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