LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2008 >> Sable Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Pinpoint Test A: No Start Through Pinpoint Test DK: Accelerator Pedal Position (App) Sensor - (Except Diesel & Hybrid) >> PINPOINT TEST DK: Accelerator Pedal Position (APP) Sensor >> Test Procedure

Test Procedure

  1. DK1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 
    • Are DTCs P1575, P2104, P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132, P2133, or P2138 present? 
    Yes No
    For DTC P1575, GO to  DK2.
    For all others, GO to  DK4.    		 For a lack/loss of power, GO to  DK3.
    For all others, GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DK2 DTC P1575: REPEAT THE KOEO SELF-TEST 
    NOTE: Make sure the accelerator pedal is not applied during the KOEO self-test.
    • Key ON, engine OFF.
    • Carry out the KOEO self-test.
    • Are any DTCs present other than P1575? 
    Yes No
    DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . GO to  DK3.
  3. DK3 CHECK THE ACCELERATOR PEDAL FOR OBSTRUCTION 
    • Key ON, engine OFF.
    • Press the accelerator pedal fully to the floor and release.
    • Does the pedal move freely to the floor and back? 
    Yes No
    GO to  DK4. ISOLATE and REPAIR the obstruction.
    CLEAR the DTCs. REPEAT the self-test.
  4. DK4 CHECK THE APP SENSOR SIGNAL VOLTAGE RANGES FOR THE ACCELERATOR PEDAL FULLY APPLIED AND RELEASED POSITIONS 
    • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
    • Press the accelerator pedal fully to the floor and release.
      ACCELERATOR PEDAL FULLY APPLIED VOLTAGE VALUES

      Vehicle APP1 APP2 APP3
      E-Series 0.73 - 1.28 3.03 - 4.55 2.59 - 3.89
      Expedition, Navigator 0.79 - 2.09 2.75 - 4.33 2.26 - 3.73
      Explorer, Explorer Sport Trac, Mountaineer 0.60 - 1.57 3.07 - 4.50 2.57 - 3.89
      F-150, Mark LT 0.60 - 1.57 3.07 - 4.50 2.57 - 3.89
      F-Super Duty 0.28 - 0.97 3.45 - 4.71 2.95 - 4.10
      Focus 3.69 - 4.60 1.75 - 2.40 -
      Fusion, Milan, MKZ 1.20 - 2.50 2.50 - 3.94 2.00 - 3.33
      All others 0.48 - 1.76 2.95 - 4.62 2.43 - 4.02
      ACCELERATOR PEDAL FULLY RELEASED VOLTAGE VALUES

      Vehicle APP1 APP2 APP3
      Focus 0.70 - 0.90 0.30 - 0.50 -
      All vehicles 3.43 - 4.69 1.13 - 1.88 0.64 - 1.28
    • Are all APP signals out of range for the pedal fully applied and released positions? 
    Yes No
    GO to  DK5. For continuous memory DTCs P2121 and P2126 with P2131, GO to  DK24.
    For all others, GO to  DK5.
  5. DK5 CHECK THE VREF VOLTAGE TO APP SENSOR 
    • 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
      ETCREF ETCRTN
    • Is the voltage between 4 - 6 V? 
    Yes No
    For E-Series, Explorer, Explorer Sport Trac, F-150, Mark LT, and Mountaineer, GO to  DK6.
    For F-Super Duty, GO to  DK7.
    For Fusion, Milan, and MKZ, GO to  DK10.
    For Focus with DTC P2122, P2123, or P2138, GO to  DK12.
    For Focus with DTC P2127 or P2128, GO to  DK16.
    For all others, GO to  DK11.    		 refer to PINPOINT TEST C .
  6. DK6 E-SERIES, EXPLORER, EXPLORER SPORT TRAC, F-150, MARK LT, MOUNTAINEER: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    NOTE: Make sure the accelerator pedal is fully released when taking the resistance measurements.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APP1 ETCREF 550 1,390
      APP1 ETCRTN 1,030 2,590
      APP1 APP2 2,125 5,335
      APP1 APP3 1,930 4,845
      APP2 ETCREF 1,785 4,480
      APP2 ETCRTN 1,475 3,705
      APP2 APP3 2,520 6,330
      APP3 ETCREF 1,620 4,070
      APP3 ETCRTN 1,135 2,860
      ETCREF ETCRTN 780 1,955
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • Are all the resistances within specifications? 
    Yes No
    For DTCs P2121, P2122 or P2123 alone or in combination, GO to  DK12.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK16.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK20.
    For DTC P2104 alone, GO to  DK30.
    For a lack/loss of power, the concern is elsewhere. RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
    For all others, GO to  DK24.    		 INSTALL a new APP sensor. REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.
  7. DK7 F-SUPER DUTY: CHECK THE ACCELERATOR PEDAL CONFIGURATION AND APP SENSOR HOUSING 
    • Check the configuration of the accelerator pedal and determine the color of the APP sensor housing.
    • Is the vehicle equipped with an adjustable accelerator pedal? 
    Yes No
    GO to  DK8. For F-Super Duty with a fixed accelerator pedal and a white APP sensor housing, GO to  DK9.
    For all others, GO to  DK11.
  8. DK8 F-SUPER DUTY WITH ADJUSTABLE ACCELERATOR PEDAL: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    NOTE: Make sure the accelerator pedal is fully released when taking the resistance measurements.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APP1 ETCREF 550 1,390
      APP1 ETCRTN 1,030 2,590
      APP1 APP2 2,125 5,335
      APP1 APP3 1,930 4,845
      APP2 ETCREF 1,785 4,480
      APP2 ETCRTN 1,475 3,705
      APP2 APP3 2,520 6,330
      APP3 ETCREF 1,620 4,070
      APP3 ETCRTN 1,135 2,860
      ETCREF ETCRTN 780 1,955
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • Are all the resistances within specifications? 
    Yes No
    For DTCs P2121, P2122 or P2123 alone or in combination, GO to  DK12.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK16.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK20.
    For DTC P2104 alone, GO to  DK30.
    For a lack/loss of power, the concern is elsewhere. RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
    For all others, GO to  DK24.    		 INSTALL a new APP sensor. REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.
  9. DK9 F-SUPER DUTY WITH FIXED ACCELERATOR PEDAL AND WHITE APP SENSOR HOUSING: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    NOTE: Make sure the accelerator pedal is fully released when taking the resistance measurements.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APP1 ETCREF 1,080 1,865
      APP1 ETCRTN 1,535 2,860
      APP1 APP2 2,820 5,225
      APP1 APP3 2,775 5,205
      APP2 ETCREF 1,995 3,700
      APP2 ETCRTN 1,625 3,170
      APP2 APP3 3,000 5,835
      APP3 ETCREF 1,985 3,735
      APP3 ETCRTN 1,440 2,870
      ETCREF ETCRTN 805 1,500
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • Are all the resistances within specifications? 
    Yes No
    For DTCs P2121, P2122 or P2123 alone or in combination, GO to  DK12.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK16.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK20.
    For DTC P2104 alone, GO to  DK30.
    For a lack/loss of power, the concern is elsewhere. RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
    For all others, GO to  DK24.    		 INSTALL a new APP sensor. REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.
  10. DK10 FUSION, MILAN, MKZ: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    NOTE: Make sure the accelerator pedal is fully released when taking the resistance measurements.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APP1 ETCREF 650 1,340
      APP1 ETCRTN 1,210 2,470
      APP1 APP2 2,430 4,960
      APP1 APP3 2,390 4,880
      APP2 ETCREF 2,020 4,120
      APP2 ETCRTN 1,650 3,380
      APP2 APP3 3,000 6,130
      APP3 ETCREF 2,010 4,110
      APP3 ETCRTN 1,450 2,970
      ETCREF ETCRTN 900 1,840
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • Are all the resistances within specifications? 
    Yes No
    For DTCs P2121, P2122 or P2123 alone or in combination, GO to  DK12.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK16.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK20.
    For DTC P2104 alone, GO to  DK30.
    For a lack/loss of power, the concern is elsewhere. RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
    For all others, GO to  DK24.    		 INSTALL a new APP sensor. REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.
  11. DK11 ALL OTHERS: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    NOTE: Make sure the accelerator pedal is fully released when taking the resistance measurements.
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APP1 ETCREF 600 1,370
      APP1 ETCRTN 720 1,660
      APP1 APP2 1,300 2,960
      APP1 APP3 1,250 2,860
      APP2 ETCREF 750 1,720
      APP2 ETCRTN 660 1,520
      APP2 APP3 1,230 2,810
      APP3 ETCREF 710 1,640
      APP3 ETCRTN 580 1,340
      ETCREF ETCRTN 200 470
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • Are all the resistances within specifications? 
    Yes No
    For DTCs P2121, P2122 or P2123 alone or in combination, GO to  DK12.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK16.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK20.
    For DTC P2104 alone, GO to  DK30.
    For a lack/loss of power, the concern is elsewhere. RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
    For all others, GO to  DK24.    		 INSTALL a new APP sensor. REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.
  12. DK12 CHECK THE APP1 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APP1 APP1
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK13. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  13. DK13 CHECK THE APP1 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) Vehicle Battery
      APP1 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK14. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  14. DK14 CHECK THE APP1 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP1 ETCRTN
      APP1 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK15. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  15. DK15 CHECK THE APP1 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) APP Sensor Connector, Harness Side ( - ) Vehicle Battery
      APP1 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK24.
  16. DK16 CHECK THE APP2 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APP2 APP2
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK17. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  17. DK17 CHECK THE APP2 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APP2 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK18. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  18. DK18 CHECK THE APP2 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP2 ETCRTN
      APP2 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK19. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  19. DK19 CHECK THE APP2 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APP2 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK25.
  20. DK20 CHECK THE APP3 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APP3 APP3
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK21. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  21. DK21 CHECK THE APP3 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APP3 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK22. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  22. DK22 CHECK THE APP3 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP3 ETCRTN
      APP3 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK23. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  23. DK23 CHECK THE APP3 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APP3 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK26.
  24. DK24 CHECK FOR THE APP1 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP1 APP2
      APP1 APP3
      APP1 ETCREF
      APP1 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK27. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  25. DK25 CHECK FOR THE APP2 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP2 APP1
      APP2 APP3
      APP2 ETCREF
      APP2 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK27. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  26. DK26 CHECK FOR THE APP3 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APP3 APP1
      APP3 APP2
      APP3 ETCREF
      APP3 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK27. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  27. DK27 CHECK THE APP SENSOR CIRCUITS FOR AN INTERMITTENT CONCERN 
    • Wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APP1 APP1
      APP2 APP2
      APP3 APP3
    • Are the resistances less than 5 ohms? 
    Yes No
    For Focus, GO to  DK28.
    For all others, GO to  DK30.    		 ISOLATE the concern and REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.
  28. DK28 CHECK FOR DTCS 
    • PCM connector connected.
    • Key ON, engine OFF.
    • Carry out the KOEO self-test.
    • Are DTCs P2122 and P2127 present? 
    Yes No
    GO to  DK29. GO to  DK30.
  29. DK29 SIMULATE THE OPPOSITE SIGNAL 
    • Key in OFF position.
    • Connect a 5 amp fused jumper wire between the following:
      Point A APP Sensor Connector, Harness Side Point B APP Sensor Connector, Harness Side
      ETCREF APP1
      ETCREF APP2
    • Key ON, engine OFF.
    • Access the PCM and monitor the APP1 and APP2 PIDs.
    • Are the voltages greater than 4.5 V? 
    Yes No
    INSTALL a new APP sensor.
    REFER to the ACCELERATION CONTROL articles to INSTALL a new accelerator pedal.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DK30.
  30. DK30 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) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
scientia non olet · About LEMON Manuals