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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1894 (Engine Controls - Pinpoint Test DK: Accelerator Pedal Position (App) Sensor Through Pinpoint Test DW: Heated Oxygen Sensor (Ho2S) - (Except Diesel & Hybrid)) >> PINPOINT TEST DK: Accelerator Pedal Position (APP) Sensor >> Test Procedure

Test Procedure

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
  1. DK1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 
    • Are DTCs P2104, P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132, or P2133 present? 
    Yes No
    GO to  DK2. For a lack/loss of power, GO to  DK2.
    For all others, GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DK2 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  DK3. ISOLATE and REPAIR the obstruction.
    CLEAR the DTCs. REPEAT the self-test.
  3. DK3 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
      Fusion, Milan, MKZ 1.20 - 2.50 2.50 - 3.94 2.00 - 3.33
      Explorer, Explorer Sport Trac, Mountaineer 0.60 -1.57 3.07 - 4.50 2.57 - 3.89
      Expedition, Navigator 0.79 - 2.09 2.75 - 4.33 2.26 - 3.73
      F-150, Mark LT 0.60 - 1.57 3.07 - 4.50 2.57 - 3.89
      E-Series 0.73 - 1.28 3.03 - 4.55 2.59 - 3.89
      F-Super Duty 0.39 - 0.97 3.45 - 4.71 2.95 - 4.10
      All others 0.48 - 1.76 2.95 - 4.62 2.43 - 4.02
      ACCELERATOR PEDAL FULLY RELEASED VOLTAGE VALUES

      Vehicle APP1 APP2 APP3
      All vehicles 3.43 - 4.69 1.13 - 1.88 0.64 - 1.28
    • Are all 3 APPS signals out of range for the pedal fully applied and released positions? 
    Yes No
    GO to  DK4. For DTCs P2104, P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132 or P2133 alone, GO to  DK5.
    For any combination of ETC related DTCs, GO to  DK4.
    For continuous memory DTCs P2121 and P2126 with P2131, GO to  DK23.
    For a lack/loss of power, GO to  DK5.
  4. DK4 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
    GO to  DK5. refer to PINPOINT TEST C .
  5. DK5 CHECK THE FUNCTIONALITY OF THE APP CIRCUITS 
    NOTE: Use the voltage measurements from DK3.
    • Is APP1, APP2, or APP3 out of range? 
    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  DK8.
    For all others, GO to  DK9.    		 GO to  DK23.
  6. DK6 E-SERIES, EXPLORER, EXPLORER SPORT TRAC, F-150, MARK LT, MOUNTAINEER: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    • 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)
      APPS1 ETCREF 550 1,390
      APPS1 ETCRTN 1,030 2,590
      APPS1 APPS2 2,125 5,335
      APPS1 APPS3 1,930 4,845
      APPS2 ETCREF 1,785 4,480
      APPS2 ETCRTN 1,475 3,705
      APPS2 APPS3 2,520 6,330
      APPS3 ETCREF 1,620 4,070
      APPS3 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  DK11.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK15.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK19.
    For DTC P2104 alone, GO to  DK27.
    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  DK23.    		 INSTALL a new APP sensor. REFER to the appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs.
    PRESS the accelerator pedal several times and REPEAT the self-test. If DTCs are present,
    GO to  DK10.
  7. DK7 F-SUPER DUTY: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
    • For vehicles with a fixed accelerator pedal.
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APPS1 ETCREF 1,080 1,865
      APPS1 ETCRTN 1,535 2,860
      APPS1 APPS2 2,820 5,225
      APPS1 APPS3 2,775 5,205
      APPS2 ETCREF 1,995 3,700
      APPS2 ETCRTN 1,625 3,170
      APPS2 APPS3 3,000 5,835
      APPS3 ETCREF 1,985 3,735
      APPS3 ETCRTN 1,440 2,870
      ETCREF ETCRTN 805 1,500
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • For vehicles with an adjustable accelerator pedal.
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APPS1 ETCREF 550 1,390
      APPS1 ETCRTN 1,030 2,590
      APPS1 APPS2 2,125 5,335
      APPS1 APPS3 1,930 4,845
      APPS2 ETCREF 1,785 4,480
      APPS2 ETCRTN 1,475 3,705
      APPS2 APPS3 2,520 6,330
      APPS3 ETCREF 1,620 4,070
      APPS3 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  DK11.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK15.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK19.
    For DTC P2104 alone, GO to  DK27.
    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  DK23.    		 INSTALL a new APP sensor. REFER to the appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs.
    PRESS the accelerator pedal several times and REPEAT the self-test. If DTCs are present,
    GO to  DK10.
  8. DK8 FUSION, MILAN, MKZ: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    • 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)
      APPS1 ETCREF 650 1,340
      APPS1 ETCRTN 1,210 2,470
      APPS1 APPS2 2,430 4,960
      APPS1 APPS3 2,390 4,880
      APPS2 ETCREF 2,020 4,120
      APPS2 ETCRTN 1,650 3,380
      APPS2 APPS3 3,000 6,130
      APPS3 ETCREF 2,010 4,110
      APPS3 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  DK11.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK15.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK19.
    For DTC P2104 alone, GO to  DK27.
    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  DK23.    		 INSTALL a new APP sensor. REFER to the appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs.
    PRESS the accelerator pedal several times and REPEAT the self-test. If DTCs are present,
    GO to  DK10.
  9. DK9 ALL OTHERS: CHECK THE APP SENSOR FOR THE CORRECT RESISTANCE 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
    • For all other vehicles with an APP sensor connector, component side populated with 7 pins:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APPS1 ETCREF 600 1,370
      APPS1 ETCRTN 720 1,660
      APPS1 APPS2 1,300 2,960
      APPS1 APPS3 1,250 2,860
      APPS2 ETCREF 750 1,720
      APPS2 ETCRTN 660 1,520
      APPS2 APPS3 1,230 2,810
      APPS3 ETCREF 710 1,640
      APPS3 ETCRTN 580 1,340
      ETCREF ETCRTN 200 470
      ETCREF ETCREF 0 10
      ETCRTN ETCRTN 0 10
    • For all other vehicles with an APP sensor connector, component side populated with 8 pins:
      (+) APP Sensor Connector, Component Side (-) APP Sensor Connector, Component Side Minimum Resistance (ohms) Maximum Resistance (ohms)
      APPS1 ETCREF 150 350
      APPS1 ETCRTN 290 650
      APPS1 APPS2 900 2,010
      APPS1 APPS3 820 1,840
      APPS2 ETCREF 800 1,790
      APPS2 ETCRTN 700 1,580
      APPS2 APPS3 1,270 2,860
      APPS3 ETCREF 720 1,630
      APPS3 ETCRTN 580 1,330
      ETCREF ETCRTN 210 470
      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  DK11.
    For DTCs P2126, P2127 or P2128 alone or in combination, GO to  DK15.
    For DTCs P2131, P2132 or P2133 alone or in combination, GO to  DK19.
    For DTC P2104 alone, GO to  DK27.
    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  DK23.    		 INSTALL a new APP sensor. REFER to the appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs.
    PRESS the accelerator pedal several times and REPEAT the self-test. If DTCs are present,
    GO to  DK10.
  10. DK10 CHECK THE APP SENSOR CIRCUIT INTEGRITY 
    • Key in OFF position.
    • APP Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Component Side ( - ) APP Sensor Connector, Component Side
      ETCREF ETCRTN
    • Is the resistance between 780 - 1,955 ohms (E-Series, Explorer, Explorer Sport Trac, F-150, F-Super Duty with an adjustable accelerator pedal, Mark LT, Mountaineer), 805 - 1,500 ohms (F-Super Duty with a fixed accelerator pedal), 900 - 1,840 ohms (Fusion, Milan, MKZ), 200 - 470 ohms (all other vehicles with an APP sensor connector, component side populated with 7 pins), or 210 - 470 ohms (all other vehicles with an APP sensor connector, component side populated with 8 pins)? 
    Yes No
    For continuous memory DTCs P2121 with P2122 or P2123, or with P2126 and P2131, GO to  DK11.
    For continuous memory DTCs P2126 with P2127 or P2128, or with P2121 and P2131, GO to  DK15.
    For continuous memory DTCs P2121 and P2122 or P2131 and P2133, GO to  DK19.    		 INSTALL a new APP sensor. REFER to the appropriate ACCELERATION CONTROL article.
    CLEAR the DTCs.
    PRESS the accelerator pedal several times and REPEAT the self-test. If DTCs are present:
    GO to  DK11.
  11. DK11 CHECK THE APPS1 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APPS1 APPS1
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK12. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  12. DK12 CHECK THE APPS1 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) Vehicle Battery
      APPS1 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK13. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  13. DK13 CHECK THE APPS1 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APPS1 ETCRTN
      APPS1 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK14. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  14. DK14 CHECK THE APPS1 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) APP Sensor Connector, Harness Side ( - ) Vehicle Battery
      APPS1 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK23.
  15. DK15 CHECK THE APPS2 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APPS2 APPS2
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK16. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  16. DK16 CHECK THE APPS2 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APPS2 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK17. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  17. DK17 CHECK THE APPS2 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APPS2 ETCRTN
      APPS2 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK18. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  18. DK18 CHECK THE APPS2 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APPS2 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK24.
  19. DK19 CHECK THE APPS3 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      APPS3 APPS3
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  DK20. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  20. DK20 CHECK THE APPS3 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APPS3 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  DK21. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  21. DK21 CHECK THE APPS3 CIRCUIT FOR A SHORT IN THE HARNESS 
    • Measure the resistance between:
      ( + ) APP Sensor Connector, Harness Side ( - ) APP Sensor Connector, Harness Side
      APPS3 ETCRTN
      APPS3 ETCREF
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK22. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  22. DK22 CHECK THE APPS3 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      APPS3 Negative terminal
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  DK25.
  23. DK23 CHECK THE APPS1 CIRCUIT FOR A SHORT TOGETHER 
    • 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
      APPS1 APPS2
      APPS1 APPS3
      APPS1 ETCREF
      APPS1 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK26. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  24. DK24 CHECK FOR THE APPS2 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
      APPS2 APPS1
      APPS2 APPS3
      APPS2 ETCREF
      APPS2 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK26. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  25. DK25 CHECK FOR THE APPS3 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
      APPS3 APPS1
      APPS3 APPS2
      APPS3 ETCREF
      APPS3 ETCRTN
    • Are the resistances greater than 10K ohms? 
    Yes No
    GO to  DK26. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  26. DK26 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
      APPS1 APPS1
      APPS2 APPS2
      APPS3 APPS3
    • Are the resistances less than 5 ohms? 
    Yes No
    GO to  DK27. ISOLATE the concern and REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.
  27. DK27 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 to FLASH 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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