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Discussion Starter · #1 ·
Wiring diagrams can be found here.

Condition
Possible Sources
Action
  • The speed control is inoperative[/*]
  • Central junction box (CJB) fuse(s):
    - 5 (5A).
    - 24 (15A).[/*]
  • Air bag sliding contact.[/*]
  • Circuitry.[/*]
  • Brake pedal position (BPP) switch.[/*]
  • Speed control deactivator switch.[/*]
  • Vehicle speed sensor (VSS) (M/T).[/*]
  • Transmission range (TR) sensor.[/*]
  • Output shaft speed (OSS) sensor (A/T).[/*]
  • Speed control actuator.[/*]
  • The set speed fluctuates[/*]
  • Speed control actuator.[/*]
  • Circuitry.[/*]
  • Vehicle speed sensor (VSS) (M/T).[/*]
  • Output shaft speed (OSS) sensor (A/T).[/*]
  • Base engine problem.[/*]
  • Loose or binding speed control cable between the speed control actuator and the throttle body.[/*]
  • The speed control does not disengage when the brakes are applied[/*]
  • Speed control deactivator switch.[/*]
  • Brake pedal position (BPP) switch.[/*]
  • Circuitry.[/*]
  • The speed control does not disengage when the clutch is applied[/*]
  • Clutch pedal position (CPP) switch.[/*]
  • Transmission range (TR) sensor (A/T) only.[/*]
  • Circuitry.[/*]
  • The speed control switch is inoperative - COAST[/*]
  • Speed control switch.[/*]
  • Speed control actuator.[/*]
  • The speed control switch is inoperative - SET/ACCL[/*]
  • Speed control switch.[/*]
  • Speed control actuator.[/*]
  • The speed control switch is inoperative - COAST[/*]
  • Speed control switch.[/*]
  • Speed control actuator.[/*]
  • The speed control switch is inoperative - COAST[/*]
  • Speed control switch.[/*]
  • Speed control actuator.[/*]
  • The speed control indicator lamp is always on[/*]
  • Circuitry.[/*]
  • Speed control actuator.[/*]
  • Instrument cluster.[/*]
 

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Discussion Starter · #2 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
A1 CHECK POWER AND GROUND TO THE SPEED CONTROL ACTUATOR
4. Measure the voltage between the speed control actuator C122 pin 7, circuit 601 (LB/PK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is the voltage greater than 10 volts?[/*]
-> Yes
-- GO to A3.
-> No
-- GO to A2.
A2 CHECK THE SPEED CONTROL ACTUATOR GROUND CIRCUIT
2. Measure the resistance between the speed control actuator C122 pin 10, circuit 57 (BK), harness side and ground.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- REPAIR circuit 601 (LB/PK). TEST the system for normal operation.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
A3 CHECK THE STOPLAMPS FOR CORRECT OPERATION
2. Check the stoplamps for correct operation by depressing and releasing the brake pedal.
  • Do the stoplamps operate correctly?[/*]
-> Yes
-- GO to A4.
-> No
-- REFER to Lighting and Horns.
A4 CHECK THE BRAKE CIRCUIT
1. Measure the resistance between the following connectors pins:

  • Are the resistances less than 5 ohms?[/*]
-> Yes
-- GO to A5.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
A5 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH (M/T) OR TRANSMISSION RANGE (TR) SENSOR (A/T)
5. For M/T, measure the resistance between the CPP switch terminal A, and the CPP switch terminal B, (component side). For A/T, measure the resistance between the TR sensor terminal 9 and the TR sensor terminal 4 (component side).
  • Is the resistance greater than 10,000 ohms?[/*]
-> Yes
-- GO to A6.
-> No
-- For (M/T), INSTALL a new CPP switch; REFER to Starting System.
-- For (A/T), REPAIR/INSTALL a new TR sensor. TEST the system for normal operation.
A6 CHECK CIRCUIT 199 (LB/YE) FOR SHORT TO GROUND
2. Measure the resistance between the speed control actuator C122 pin 2, circuit 199 (LB/YE), harness side and ground.
  • Is the resistance greater than 10,000 ohms?[/*]
-> Yes
-- GO to A7.
-> No
-- REPAIR the suspected circuit. TEST the system for normal operation.
A7 CHECK THE DEACTIVATOR SWITCH INPUT TO THE SPEED CONTROL ACTUATOR
2. Measure the voltage between the speed control actuator C122 pin 9, circuit 810 (RD/LG), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is the voltage greater than 10 volts?[/*]
-> Yes
-- GO to A10.
-> No
-- GO to A8.
A8 CHECK THE DEACTIVATOR SWITCH
2. Measure the resistance between the deactivator switch terminal 1, and the deactivator switch terminal 2, component side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to A9.
-> No
-- INSTALL a new deactivator switch; REFER to Brake Switch (Cruise Control). TEST the system for normal operation.
A9 CHECK DEACTIVATOR SWITCH POWER
1. Measure the voltage between the deactivator switch C277 pin 2, circuit 10 (LG/RD), harness side and ground.
  • Is the voltage greater than 10 volts?[/*]
-> Yes
-- REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
-> No
-- REPAIR circuit 10 (LG/RD). TEST the system for normal operation.
A10 CHECK FOR SHORT TO POWER ON CIRCUIT 151 (LB/BK)
2. Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK) harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is any voltage indicated?[/*]
-> Yes
-- GO to A11.
-> No
-- GO to A13.
A11 CHECK FOR STUCK SPEED CONTROL SWITCH
3. Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is any voltage indicated?[/*]
-> Yes
-- GO to A12.
-> No
-- INSTALL a new speed control switch; REFER to Cruise Control Switch. TEST the system for normal operation.
A12 RECHECK CIRCUIT 151 (LB/BK) FOR SHORT TO POWER
4. Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is any voltage indicated?[/*]
-> Yes
-- REPAIR circuit 151 (LB/BK). TEST the system for normal operation.
-> No
-- INSTALL a new air bag sliding contact; REFER to Air Bag Systems. TEST the system for normal operation.
A13 CHECK THE SPEED CONTROL SWITCH OPERATION
1. Measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side, while depressing speed control switch SET/ACCEL.
  • Is the resistance between 640 and 720 ohms?[/*]
-> Yes
-- GO to A14.
-> No
-- GO to A15.
A14 CHECK THE SPEED CONTROL SWITCH ON OPERATION
2. Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side, while depressing the speed control switch ON.
  • Is the voltage greater than 10 volts?[/*]
-> Yes
-- GO to A18.
-> No
-- INSTALL a new speed control switch, REFER to Cruise Control Switch. TEST the system for normal operation.
A15 CHECK CIRCUIT 151 (LB/BK) FOR AN OPEN
3. Measure the resistance between the air bag sliding contact C218a pin 2, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to A16.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
A16 CHECK CIRCUIT 848 (DG/OG) FOR AN OPEN
1. Measure the resistance between the air bag sliding contact C218a pin 3, circuit 848 (DB/OG), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to A17.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
A17 CHECK THE AIR BAG SLIDING CONTACT
2. Measure the resistance between the speed control switch connector pin B, and the speed control switch connector pin C, while depressing the speed control switch SET/ACCEL.
  • Is the resistance between 640 and 720 ohms with the speed control actuator switch SET/ACCEL depressed?[/*]
-> Yes
-- INSTALL a new air bag sliding contact, REFER to Air Bag Systems. TEST the system for normal operation.
-> No
-- INSTALL a new speed control switch, REFER to Cruise Control Switch. TEST the system for normal operation.
A18 CHECK THE SPEEDOMETER OPERATION
1. Drive the vehicle and observe the speedometer operation.
  • Does the speedometer operate correctly?[/*]
-> Yes
-- GO to A19.
-> No
-- REFER to Instrument Panel, Gauges and Warning Indicators.
A19 CHECK CIRCUIT 679 (GY/BK) FOR OPEN
4. Measure the resistance between the speed control actuator C122 pin 3, circuit 679 (GY/BK), harness side and PCM C175 pin 28 (2.0L Zetec) or pin 68 3.0L (4V), circuit 679 (GY/BK), harness side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to A20.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
A20 CHECK THE SPEED CONTROL CABLE/THROTTLE BODY LINKAGE
2. Remove the speed control cable from the speed control actuator. Visually inspect the core wire and check the speed control cable by pulling on it and noting the throttle movement.
  • Is the speed control cable and throttle body linkage OK?[/*]
-> Yes
-- INSTALL a new speed control actuator, REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- INSTALL a new speed control cable or REPAIR the throttle body linkage. To install a new speed control cable, REFER to Cruise Control Servo Cable. TEST the system for normal operation. For repair of the throttle body linkage, REFER to Throttle Cable/Linkage. TEST the system for normal operation.
 

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Discussion Starter · #3 ·
CONDITIONS
DETAILS/RESULTS/ACTIONS
B1 CHECK THE SPEED CONTROL CABLE/THROTTLE BODY LINKAGE
2. Remove the speed control cable from the speed control actuator. Visually inspect the core wire and check the speed control cable by pulling on it and noting the throttle movement.
  • Is the speed control cable and throttle body linkage OK?[/*]
-> Yes
-- GO to B2.
-> No
-- INSTALL a new speed control cable or REPAIR the throttle body linkage. To install a new speed control cable, REFER to Cruise Control Servo Cable. TEST the system for normal operation. For repair of the throttle body linkage, REFER to Throttle Cable/Linkage. TEST the system for normal operation.
B2 CHECK THE SPEEDOMETER OPERATION
1. Drive the vehicle and observe the speedometer operation.
  • Does the speedometer needle fluctuate?[/*]
-> Yes
-- REFER to Instrument Panel, Gauges and Warning Indicators.
-> No
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
 

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Discussion Starter · #4 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
C1 CHECK THE STOPLAMPS FOR CORRECT OPERATION
1. Check the stoplamps for correct operation by depressing and releasing the brake pedal.
  • Do the stoplamps operate correctly?[/*]
-> Yes
-- GO to C2.
-> No
-- REFER to Lighting and Horns.
C2 CHECK THE BRAKE CIRCUIT
3. Measure the voltage between the speed control actuator C122 pin 4, circuit 511 (LG), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
  • Is the voltage greater than 10 volts?[/*]
-> Yes
-- INSTALL a new speed control actuator, REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- REPAIR circuit 511 (LG). TEST the system for normal operation.
 

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Discussion Starter · #5 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
D1 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH
3. Clutch is applied.
4. Measure the resistance between the clutch pedal position (CPP) switch terminal A, and the CPP switch terminal B (component side).
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to D2.
-> No
-- INSTALL a new CPP switch; REFER to Starting System. TEST the system for normal operation.
D2 CHECK CIRCUIT 199 (LB/YE) FOR AN OPEN
3. Measure the resistance between the speed control actuator C122 pin 2, circuit 199 (LB/YE), harness side and the CPP switch C2070, circuit 199 (LB/YE), harness side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- GO to D3
-> No
-- REPAIR the circuit. TEST the system for normal operation.
D3 CHECK CIRCUIT 89 (OG) FOR AN OPEN
1. Measure the resistance between the CPP switch C2070, circuit 89 (OG), harness side and ground.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
 

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Discussion Starter · #6 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
E1 CHECK COAST SWITCH OPERATION
3. With the speed control switch COAST depressed, measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side.
  • Is the resistance between 114 and 126 ohms?[/*]
-> Yes
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- INSTALL a new speed control switch; REFER to Cruise Control Switch. TEST the system for normal operation.
 

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Discussion Starter · #7 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
F1 CHECK SET/ACCEL SWITCH OPERATION
3. With the speed control switch SET/ACCEL depressed, measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side.
  • Is the resistance between 646 and 714 ohms?[/*]
-> Yes
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- INSTALL a new speed control actuator switch; REFER to Cruise Control Switch. TEST the system for normal operation.
 

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Discussion Starter · #8 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
G1 CHECK RESUME SWITCH OPERATION
3. With the speed control switch RESUME depressed, measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side.
  • Is the resistance between 2,090 and 2,310 ohms?[/*]
-> Yes
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- INSTALL a new speed control switch; REFER to Cruise Control Switch. TEST the system for normal operation.
 

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Discussion Starter · #9 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
H1 CHECK OFF SWITCH OPERATION
3. With the speed control switch OFF depressed, measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side.
  • Is the resistance less than 5 ohms?[/*]
-> Yes
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
-> No
-- INSTALL a new speed control switch; REFER to Cruise Control Switch. TEST the system for normal operation.
 

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Discussion Starter · #10 ·
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CONDITIONS
DETAILS/RESULTS/ACTIONS
I1 CHECK SPEED CONTROL ACTUATOR FOR SHORT TO GROUND
  • Is the indicator lamp illuminated?[/*]
-> Yes
-- GO to I2
-> No
-- INSTALL a new speed control actuator; REFER to Cruise Control Servo. TEST the system for normal operation.
I2 CHECK CIRCUIT 203 (OG/LB) FOR SHORT TO GROUND
2. Measure the resistance between the speed control actuator C122 pin 1, circuit 203 (OG/LB), harness side and ground.
  • Is the resistance greater than 10,000 ohms?[/*]
-> Yes
-- INSTALL a new instrument cluster. REFER to Instrument Panel, Gauges and Warning Indicators.
-> No
-- REPAIR the circuit. TEST the system for normal operation.
 
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