Pinpoint Test D: The Speed Control Does Not Disengage When The Clutch Is Applied

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH OUTPUT
- Disconnect: Powertrain Control Module (PCM) C175b.
- Measure the resistance between the PCM 3175b-32, circuit 306 (TN/LB), harness side and ground.
  
  Fig 1: Checking Continuity Between Connector And Ground
  Courtesy of FORD MOTOR CO.
- Is the is the resistance less than 5 ohms?
- Yes : GO to D2.
- No : GO to D3.
D2 CHECK CIRCUIT 306 (TN/LB) FOR A SHORT TO GROUND
- Disconnect: CPP Switch C277.
- Measure the resistance between the PCM C175b-32, circuit 306 (TN/LB), harness side and ground.
  
  Fig 2: Checking Continuity Between Connector And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : GO to D3.
D3 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the PCM connectors and make sure they are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new PCM. REFER to FUEL CHARGING AND CONTROLS - 5.4L (3V) or FUEL CHARGING AND CONTROLS - 6.8L (3V) .
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.