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PINPOINT TEST G: DTCS B1990 and B1991: PEDAL FORWARD/REARWARD POTENTIOMETER FEEDBACK CIRCUIT SHORT TO BATTERY

  1. G1 CHECK DSM FOR CORRECT OUTPUTS - MONITOR THE DSM PID PDL___POS 
    • Use the adjustable pedal switch to move the pedals to a central position.
    • Monitor the DSM PID PDL___POS while moving the adjustable pedal switch into the FWD position, then into the RWD position.
    • Does the PID value decrease with forward movement, and increase with rearward movement, throughout the pedal's entire travel? 
  2. G2 CHECK PEDAL POSITION SENSOR CIRCUITS FOR SHORT TO POWER 
    • Disconnect: DSM C305a.
    • Disconnect: Adjustable Pedal Motor C2003.
    • Measure the voltage between adjustable pedal motor C2003-2, circuit 1491 (LB/YE), harness side and ground; and between adjustable pedal motor C2003-1, circuit 446 (OG/WH), harness side and ground; and between adjustable pedal motor sensor C2003-3, circuit 447 (OG/RD), harness side and ground.
    • Is the voltage greater than 10 volts in any check? 
    • Yes  : REPAIR the short to battery in circuit 1491 (LB/YE), circuit 446 (OG/WH), or circuit 447 (OG/RD), as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  :GO to G3.
  3. G3 CHECK PEDAL POSITION SENSOR CIRCUITS FOR SHORT TO GROUND 
    • Measure the resistance between adjustable pedal motor C2003-2, circuit 1491 (LB/YE), harness side and ground; and between adjustable pedal motor C2003-1, circuit 446 (OG/WH), harness side and ground; and between adjustable pedal motor C2003-3, circuit 447 (OG/RD), harness side and ground.
    • Is the resistance less than 10,000 ohms? 
    • Yes  : GO to G4.
    • No  :REPAIR circuit 1491 (LB/YE), circuit 446 (OG/WH), or circuit 447 (OG/RD), as necessary. CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK PEDAL POSITION CIRCUITS FOR AN OPEN 
    • Measure the resistance between adjustable pedal motor sensor C2003-2, circuit 1491 (LB/YE), harness side and DSM A341c-15, circuit 1491 (LB/YE), harness side; and between adjustable pedal motor C2003-1, circuit 446 (OG/WH), harness side and DSM A341c-3, circuit 446 (OG/WH), harness side; and between adjustable pedal motor sensor C2003-3, circuit 447 (OG/RD), harness side and A341c-1, circuit 447 (OG/RD), harness side.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to G5.
    • No  :REPAIR circuit 1491 (LB/YE), circuit 446 (OG/WH), or circuit 447 (OG/RD), as necessary. CLEAR the DTCs. REPEAT the self-test.
  5. G5 CHECK ADJUSTABLE PEDAL MOTOR SENSOR 
    • Disconnect: Adjustable Pedal Motor C2003.
    • Measure the resistance between adjustable pedal motor C2003-2, circuit 1491 (LB/YE), and adjustable pedal motor C2003-1, circuit 446 (OG/WH), harness side and between adjustable pedal motor C2003-2, circuit 1491 (LB/YE) and C2003-3, circuit 447 (OG/RD) component side.
    • Are the resistances between 5,400 ohms and 3,700 ohms? 
    • Yes  : INSTALL a new DSM. refer to SEATING . CLEAR the DTCs. REPEAT the self-test.
    • No  :INSTALL a new adjustable pedal motor. CLEAR the DTCs. REPEAT the self-test. refer to DISC - EXCURSION, F250-F550 SUPER DUTY PICKUP . CLEAR the DTCs. REPEAT the self-test.
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