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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1790 (Engine Controls - Pinpoint Tests - Diesel 6.0L (99P E-Series & 99P F450/550)) >> PINPOINT TEST AG: Accelerator Pedal Position (APP) Sensor >> Test Procedure

Test Procedure

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  1. AG1 PRELIMINARY DIAGNOSIS 
    • Carry out a visual inspection.
    • Retrieve and record any continuous and on-demand diagnostic trouble codes (DTCs).
    • Record the freeze frame data.
    • Clear the DTCs.
    • Carry out the KOEO self-test.
    • Are any DTCs retrieved? 
    Yes No
    For DTC P2122, P2127, P2132, GO to  AG2.
    For DTC P2123, P2128, P2133, GO to  AG7.
    For DTC P2138, P2139, P2140, GO to  AG12.
    For DTC P2104, GO to  AG15.    		 Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to the SYMPTOM CHARTS article, Symptom Charts, if a driveability concern exists.
  2. AG2 DIAGNOSTIC TROUBLE CODES (DTCS) P2122, P2127, AND P2132 
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Apply and release the accelerator pedal.
    • Do all signal values change when the accelerator is applied and released? 
    Yes No
    Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to the SYMPTOM CHARTS article, Symptom Charts, if a driveability concern exists. GO to  AG3.
  3. AG3 CHECK THE VREF SENSOR CIRCUITS 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      VREF - Pin 6, 7 SIGRTN - Pin 1, 3
    • Are the voltages between 4.5 - 5.5 volts? 
    Yes No
    GO to  AG4. refer to PINPOINT TEST B .
  4. AG4 CHECK THE APP SENSOR OPERATION 
    • Connect a 5 amp fused jumper wire between the following:
      Point A APP Sensor Connector, Harness Side Point B APP Sensor Connector, Harness Side
      VREF - Pin 6 APP1 - Pin 2
      VREF - Pin 6 APP2 - Pin 5
      VREF - Pin 6 APP3 - Pin 8
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Are the voltages between 4.5 - 5.5 V? 
    Yes No
    INSTALL a new APP sensor. REFER to appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  AG5.
  5. AG5 CHECK THE APP SENSOR SIGNAL FOR AN OPEN 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APP1 - Pin 2 APP1 - Pin B26
      APP2 - Pin 5 APP2 - Pin B37
      APP3 - Pin 8 APP3 - Pin B25
    • Are the resistances less than 5 ohms? 
    Yes No
    GO to  AG6. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  6. AG6 CHECK THE APP SENSOR SIGNAL FOR A SHORT TO GROUND 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - )
      APP1 - Pin 2 Ground
      APP2 - Pin 5 Ground
      APP3 - Pin 8 Ground
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  AG18. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  7. AG7 DIAGNOSTIC TROUBLE CODES (DTCS) P2123, P2128, AND P2133 
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Apply and release the accelerator pedal.
    • Do all the signal values change when the accelerator is applied and released? 
    Yes No
    Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to the SYMPTOM CHARTS article, Symptom Charts, if a driveability concern exists. GO to  AG8.
  8. AG8 SIMULATE THE OPPOSITE SIGNAL 
    NOTE: The APP sensor is disconnected to simulate the opposite DTC.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Do all PID signal values read 0 volts? 
    Yes No
    GO to  AG11. GO to  AG9.
  9. AG9 CHECK THE APP SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) APP Sensor Connector, Harness Side ( - )
      APP1 - Pin 2 Ground
      APP2 - Pin 5 Ground
      APP3 - Pin 8 Ground
    • Are the voltages less than 0.2 V? 
    Yes No
    GO to  AG10. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  10. AG10 CHECK THE APP SIGNAL CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - )
      APP1 - Pin 2 Ground
      APP2 - Pin 5 Ground
      APP3 - Pin 8 Ground
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  AG18. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  11. AG11 CHECK THE APP SIGNAL RETURN CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      SIGRTN - Pin B20, B33 SIGRTN - Pin 1, 3
    • Are the resistances less than 5 ohms? 
    Yes No
    INSTALL a new APP sensor. REFER to appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs. REPEAT the self-test.    		 REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  12. AG12 DIAGNOSTIC TROUBLE CODES (DTCS) P2138, P2139, AND P2140 
    • Clear the DTCs.
    • Carry out the KOEO and KOER self-test.
    • Are DTCs P2138, P2139 or P2140 present? 
    Yes No
    GO to  AG13. Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to the SYMPTOM CHARTS article, Symptom Charts, if a driveability concern exists.
  13. AG13 CHECK THE ACCELERATOR PEDAL ASSEMBLY FOR BINDING 
    • Apply the accelerator pedal slowly to the floor and release.
    • Does the accelerator pedal move to the floor and return without binding? 
    Yes No
    GO to  AG14. INSTALL a new APP sensor. REFER to appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs. REPEAT the self-test.
  14. AG14 CHECK THE APP SENSOR SIGNAL VOLTAGE RANGES 
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Apply the accelerator pedal slowly to the floor and release.
      Pedal Position APP1 APP2 APP3
      CT 3.43 - 4.69 1.13 - 1.88 0.64 - 1.28
      WOT 0.73 - 1.28 3.03 - 4.55 2.59 - 3.89
    • Are the PID voltage values within the range specified in the table? 
    Yes No
    GO to  AG18. INSTALL a new APP sensor. REFER to appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs. REPEAT the self-test.
  15. AG15 DIAGNOSTIC TROUBLE CODE (DTC) P2104 
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP2 and APP3 PIDs.
    • Slowly apply and release the accelerator pedal while observing the PID voltage values.
      Pedal Position APP2 APP3
      Released (Closed Throttle) 1.13 - 1.88 0.64 - 1.28
      Fully Applied (Wide Open Throttle) 3.45 - 4.71 2.95 - 4.10
    • Are the PID voltage values within the range specified in the table? 
    Yes No
    Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to the SYMPTOM CHARTS article, Symptom Charts, if a driveability concern exists. GO to  AG16.
  16. AG16 CHECK THE APP SENSOR 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Component Side ( - ) APP Sensor Connector, Component Side
      APP1 - Pin 2 APP3 - Pin 8
    • Is the resistance between 2.7K - 6.5K ohms? 
    Yes No
    GO to  AG17. INSTALL a new APP sensor. REFER to appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs. REPEAT the self-test.
  17. AG17 CHECK THE APP SENSOR SIGNAL CIRCUITS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP1 - Pin 2 APP3 - Pin 8
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  AG18. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  18. AG18 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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