Ford Mustang Service Manual: Switch - Speed Control Actuator
Speed Control (Diagnosis and Testing)
Refer to Wiring Diagrams Cell 31 , Speed Control for schematic and connector information.
Special Tool(s)
Worldwide Diagnostic System (WDS) 418-F224, New Generation STAR (NGS) Tester 418-F052, or equivalent diagnostic tool | |
73 Digital Multimeter or equivalent 105-R0051 | |
Breakout Box, EEC-V Control System 418-049, or equivalent 014-00950 |
Principles of Operation
The speed control system is designed to maintain vehicle speed above 48 km/h (30 mph). After the ON switch is depressed, depressing the SET/ACCEL switch will activate the speed control servo. To increase a set speed, either depress and hold for continuous acceleration, or momentarily tap the SET/ACCEL switch for 1.6 km/h (1 mph) acceleration increments. To decrease a set speed, depress and hold the COAST switch until the target speed is reached, or momentarily tap the COAST switch for 1.6 km/h (1 mph) deceleration increments. When the speed control system has been disabled by tapping the brake pedal, the RESUME switch can be depressed and the vehicle will return to the original set speed if the vehicle is traveling over 48 km/h (30 mph) and the OFF switch has not been depressed.
NOTE: The deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is depressed, an electrical signal from the brake lamp circuit to the speed control servo will deactivate the system. Under increased brake pedal effort, the deactivator switch will open and remove power to the speed control servo, releasing the throttle independent of the speed control servo.
NOTE: The air bag sliding contract provides the electrical interface between the steering column wiring and the speed control actuator switches in the steering wheel.
The inputs to the speed control servo are the:
- vehicle speed signal.
- speed control actuator switches.
- brake pedal position (BPP) switch.
- clutch pedal position (CPP) switch.
- deactivator switch.
The output of the speed control servo is the:
- speed control actuator cable controlling the throttle position.
Inspection and Verification
NOTE: If any concerns are noted with the speedometer, stoplamps, or horn, address those concerns by referring to their associated sections before continuing speed control diagnosis.
1. Verify the customer concern by operating the speed control system.
2. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical | Electrical |
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3. If the fault is not visually evident, verify the symptom and GO to the Symptom chart.
Symptom Chart
NOTE: New speed control diagnostic software is available in Version 12 or higher for the diagnostic tool. When using this software, it is necessary to use Next Generation Speed Control Adapter 007- 00586 with the diagnostic tool.
NOTE: Refer to the Wiring Diagrams for connector numbers stated in the Pinpoint Test.
Symptom Chart
Condition | Possible Sources | Action |
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Pinpoint Tests
PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE
Test Step | Result / Action to Take |
A1 CHECK THE SPEED CONTROL SERVO VOLTAGE AND GROUND | Yes GO to A3 . No GO to A2 . |
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A2 CHECK THE CIRCUIT 1205 (BK) FOR AN OPEN | Yes REPAIR Circuit 294 (WH/LB). TEST the system for normal operation. No REPAIR Circuit 1205 (BK). TEST the system for normal operation. |
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A3 CHECK DEACTIVATOR SWITCH CIRCUITRY | Yes GO to A6 . No GO to A4 . |
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A4 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN | Yes GO to A5 . No REPAIR the circuit. TEST the system for normal operation. |
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A5 CHECK CIRCUIT 636 (OG) FOR AN OPEN | Yes INSTALL a new deactivator switch; REFER to Switch- Deactivator . TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. |
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A6 CHECK THE SPEED CONTROL ACTUATOR SWITCH ON CIRCUITRY | Yes GO to A9 . No GO to A7 . |
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A7 CHECK CIRCUIT 151 (LB/BK) FOR AN OPEN | Yes GO to A8 . No REPAIR the circuit. TEST the system for normal operation. |
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A8 CHECK THE AIR BAG SLIDING CONTACT | Yes INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. No INSTALL a new air bag sliding contact; REFER to Section. TEST the system for normal operation. |
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A9 CHECK THE SPEED CONTROL ACTUATOR SWITCH ON CIRCUITRY FOR SHORT TO POWER | Yes GO to A10 . No GO to A12 . |
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A10 CHECK CIRCUIT 151 (LB/BK) FOR SHORT TO POWER | Yes REPAIR the circuit. TEST the system for normal operation. No GO to A11 . |
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A11 CHECK THE AIR BAG SLIDING CONTACT | Yes INSTALL a new air bag sliding contact; REFER to Section. TEST the system for normal operation. No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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A12 CHECK THE SPEED CONTROL ACTUATOR SET/ACCEL CIRCUITRY | Yes GO to A13 . No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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A13 CHECK THE BPP SWITCH CIRCUITRY | Yes GO to A16 . No If automatic transmission, REPAIR Circuit 511 (LG) and Circuit 810 (LG/RD) as necessary. TEST the system for normal operation. If manual transmission, GO to A14 . |
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A14 CHECK CIRCUIT 511 (LG) AND CIRCUIT 810 (RD/LG) FOR AN OPEN | Yes GO to A15 . No REPAIR Circuit 511 (LG) and Circuit 810 (LG/RD) as necessary. TEST the system for normal operation. |
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A15 CHECK CIRCUIT 511 (LG) FOR AN OPEN | Yes INSTALL a new CPP switch. TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. |
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A16 CHECK CIRCUIT 239 (WH/OG) FOR AN OPEN | Yes GO to A17 . No REPAIR the circuit. TEST the system for normal operation. |
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A17 CHECK THE SPEED CONTROL SERVO | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new PCM; REFER to Section. TEST the system for normal operation. |
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PINPOINT TEST B: THE SET SPEED FLUCTUATES
Test Step | Result / Action to Take |
B1 CHECK THAT CONDITION OCCURS ONLY WHILE USING SPEED CONTROL | Yes REPAIR engine as necessary. TEST the system for normal operation. No GO to B2 . |
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B2 CHECK THE SPEED CONTROL ACTUATOR CABLE | Yes GO to B3 . No INSTALL a new speed control actuator cable; REFER to Actuator Cable-Speed Control . TEST the system for normal operation. |
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B3 CHECK THE SPEED CONTROL SERVO | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new PCM; REFER to Section. TEST the system for normal operation. |
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PINPOINT TEST C: THE SPEED CONTROL DOES NOT DISENGAGE WHEN THE BRAKES ARE APPLIED
Test Step | Result / Action to Take |
C1 CHECK THE BPP SWITCH CIRCUITRY | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No REPAIR Circuit 810 (RD/LG) and Circuit 511 (LG) as necessary. TEST the system for normal operation. |
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PINPOINT TEST D: THE SPEED CONTROL DOES NOT DISENGAGE WHEN THE CLUTCH IS APPLIED
Test Step | Result / Action to Take |
D1 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new CPP switch. TEST the system for normal operation. |
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PINPOINT TEST E: THE SPEED CONTROL SWITCH IS INOPERATIVE-COAST
Test Step | Result / Action to Take |
E1 CHECK THE SPEED CONTROL ACTUATOR SWITCH | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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PINPOINT TEST F: THE SPEED CONTROL SWITCH IS INOPERATIVE-SET/ACCEL
Test Step | Result / Action to Take |
F1 CHECK THE SPEED CONTROL ACTUATOR SWITCH | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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PINPOINT TEST G: THE SPEED CONTROL SWITCH IS INOPERATIVE - RESUME
Test Step | Result / Action to Take |
G1 CHECK THE SPEED CONTROL ACTUATOR SWITCH | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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PINPOINT TEST H: THE SPEED CONTROL SWITCH IS INOPERATIVE-OFF
Test Step | Result / Action to Take |
H1 CHECK THE SPEED CONTROL ACTUATOR SWITCH | Yes INSTALL a new speed control servo; REFER to Actuator-Speed Control Servo . TEST the system for normal operation. No INSTALL a new speed control actuator switch; REFER to Switch- Speed Control Actuator . TEST the system for normal operation. |
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Switch Adjustment -Deactivator
1. Adjust the deactivator switch.
1. Disconnect the switch hook from the brake pedal.
2. Depress the switch hook and plunger into the deactivator switch body until the adjustment locking tab snaps into place within the hook.
3. Depress the brake pedal and reattach the switch hook.
Switch - Deactivator
Speed Control (Diagnosis and Testing) Refer to Wiring Diagrams Cell 31 , Speed Control for schematic and connector information. Special Tool(s) Worldwide Diagnostic System (WDS) 418-F2 ...Other materials:
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