Component Locations
Speed Control SystemThe integral vehicle speed control system (IVSC) consists of:
- Speed control actuator switch.
- Speed control servo.
- Speed control actuator.
- Powertrain control module (PCM).
- Vehicle speed sensor (VSS).
- Stoplight switch.
- Clutch pedal position switch (CPP switch).
- Speed control dump valve.
- Horn relay and bracket.
- Speed control vacuum reservoir.
- Speed control vacuum valve.
- Necessary wires and vacuum hoses.
Speed Control Servo:
- Is mounted in the engine compartment as shown in the illustrations and is connected to the throttle linkage with a speed control actuator.
- The speed control servo is connected to the speed control vacuum reservoir and to vacuum outlet manifold through the speed control vacuum valve as shown in the illustrations.
Powertrain Control Module:
- Is located behind the glove compartment in the instrument panel as shown.
Speed Control Actuator Switch Assembly:
- Is mounted in the steering wheel.
It consists of:
- The LH buttons (ON, OFF).
- RH buttons (RESUME, SET/ACCEL, COAST).
- Necessary wiring.
- In IVSC system, powertrain control module functionally replaces speed control amplifier.
Vehicle Speed Sensor (VSS):
- Is mounted to the transaxle.
- Is a magnetic pickup driven by a gear which is driven by the transaxle.
- Signal sent to the powertrain control module is proportional to vehicle speed.
Air Bag Sliding Contacts:
- Is located at the center of steering wheel.
- It transfers electrical signals from the steering column wiring to driver side air bag module, Horn blow switch and speed control actuator switch assembly.
Stoplight Switch:
- Is a normally open switch that closes when the brake pedal is applied.
- Then an electrical signal is sent to the powertrain control module and the speed control system is disengaged.
- The clutch pedal position switch:
- Is mounted to the clutch pedal.
- It is a normally open switch that closes when the clutch pedal is pressed.
- Then, an electrical circuit between the powertrain control module and the stoplamps is opened and the speed control system is disengaged.
The Speed Control Dump valve:
- Provides an additional redundant safety feature in the system.
- Normally, when the brake pedal is applied, an electrical signal from the stoplamps to the powertrain control module turns OFF the system.
- In addition, the speed control dump valve mechanically releases the vacuum in the speed control servo when the brake pedal is applied.
- This releases the throttle independently of the powertrain control module.
Speed Control Vacuum Valve:
- Is used to apply either manifold vacuum or reservoir vacuum, whichever is greater, to the speed control servo.
- Speed control servo is connected to the vacuum outlet manifold and to speed control vacuum reservoir through speed control vacuum valve.
Speed Control Vacuum Reservoir:
- Is located in the engine compartment on the LH side and is attached to the A-pillar.
- The speed control vacuum reservoir provides supplemental vacuum source for the speed control system.
- It is connected to the speed control servo through the speed control vacuum valve.