Pinpoint Test E: The Speed Control Does Not Disengage When The Brakes Are Applied

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

E1 MONITOR THE STOPLAMP SWITCH PID
- Monitor the SJB stoplamp switch PID while applying and releasing the brake pedal.
- Do the PID values agree with the application and release of the brake pedal?
Yes

GO to E2.

No

Refer to EXTERIOR LIGHTING to diagnose the stoplamps.
E2 CHECK CIRCUIT 535 (LB/RD) FOR VOLTAGE
- Disconnect: Speed Control Actuator C122.
- Key in ON position.
- While firmly applying the brake pedal, measure the voltage between the speed control actuator C122-9, circuit 535 (LB/RD), harness side and ground.
  
  Fig 1: Checking Circuit 535 (Lb/Rd) Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes

GO to E3.

No

GO to E3.
E3 CHECK THE SPEED CONTROL DEACTIVATOR SWITCH
- Key in OFF position.
- Disconnect: Speed Control Deactivator Switch C1025.
- Key in ON position.
- Measure the voltage between the speed control deactivator switch C1025-9, circuit 535 (LB/RD), harness side and ground.
  
  Fig 2: Measuring Voltage Between Speed Control Deactivator Switch C1025-9, Circuit 535 (LB/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes

GO to E4.

No

INSTALL a new speed control deactivator switch. Refer to SPEED CONTROL DEACTIVATOR SWITCH . TEST the system for normal operation.
E4 CHECK CIRCUIT 535 (LB/RD) FOR SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: BEC C1035.
- Key in ON position.
- Measure the voltage between the speed control actuator C122-9, circuit 535 (LB/RD), harness side and ground.
  
  Fig 3: Measuring Voltage Between Speed Control Actuator C122-9, Circuit 535 (LB/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes

REPAIR the circuit. TEST the system for normal operation.

No

GO to E5.
E5 CHECK CIRCUIT 535 (LB/RD) FOR VOLTAGE
- Key in OFF position.
- Disconnect: ABS Module C155.
- Key in ON position.
- Measure the voltage between the ABS module C155-6, circuit 535 (LB/RD), harness side and ground.
  
  Fig 4: Measuring Voltage Between ABS Module C155-6, Circuit 535 (Lb/Rd), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes

REPAIR circuit 535 (LB/RD). TEST the system for normal operation.

No

GO to E6.
E6 CHECK THE BEC
- Key in OFF position.
- Connect: BEC C1035.
- Key in ON position.
- Measure the voltage between the ABS module C155-6, circuit 535 (LB/RD), harness side and ground.
  
  Fig 5: Measuring Voltage Between ABS Module C155-6, Circuit 535 (Lb/Rd), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes

REPAIR or INSTALL a new BEC. TEST the system for normal operation.

No

GO to E8.
E7 CHECK FOR CORRECT SPEED CONTROL ACTUATOR OPERATION
- Disconnect the speed control actuator connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the speed control actuator connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes

INSTALL a new speed control actuator. Refer to SPEED CONTROL ACTUATOR . TEST the system for normal operation.

No

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
E8 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect the ABS module connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the ABS module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes

INSTALL a new ABS module. Refer to ANTI-LOCK CONTROL . TEST the system for normal operation.

No

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.