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HOMESERVICE MANUALSCHEVROLET1995BERETTA L4-2.2L VIN 4REPAIR AND DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONCIRCUIT OPERATION
1995 Chevrolet Beretta L4-2.2L VIN 4
Circuit Operation
1995 Chevrolet Beretta L4-2.2L VIN 4SECTION Circuit Operation
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades up or down may cause variations in the selected speeds. The electronic cruise control system has the capability to cruise, coast, resume speed, accelerate, and "tap-up" and "tap-down."
An electronic Controller and Electric Motor are contained in the Cruise Control Module. The Controller monitors vehicle speed and operates the Electric Motor. In response to the Controller, the motor moves a connecting strap that is attached to the Cruise Control Cable. The Cable moves the Throttle Linkage to vary throttle position in order to maintain the desired cruise speed. The Cruise Control Module contains a low speed limit which will prevent system engagement below a minimum speed, approximately 25 mph. The module is controlled by mode control switches located on the Multi-Function Lever. Cruise Control is in "Standby Disabled" mode until all conditions inconsistent with Cruise Control operation are cleared.
With the Ignition Switch in "RUN," battery voltage is applied to terminal "F" of the Cruise Control Module. When the Slider Switch is moved to the "ON" position, battery voltage is applied to terminal "A" of the Cruise Control Module Connector. If the brake pedal is not depressed, battery voltage is present at module terminal "D". If the brake pedal is depressed, battery voltage is present at module terminal "G". Terminal "G" must see current flow for the cruise to operate (disable) properly. When the Slider Switch is moved to the "R/A" position, battery voltage is applied to terminal "C" of the module. With the Set Switch depressed, battery voltage is present at module terminal"B". Cruise Control Module Connector terminal "K" is the speed signal terminal. In operation, voltage will oscillate between a high of battery voltage and a low of near 0.5 volts. Ground is at module terminal "E". Terminal "J" is used to signal the Powertrain Control Module (PCM) when Cruise Control is "engaged." The PCM will then determine the correct shift pattern for the transmission. Terminal "H" is used by the PCM to "Inhibit" Cruise Control when conditions not consistent with cruise operation are present. These are Cruise Control Inhibit Criteria.
The PCM will "Inhibit" Cruise Control when:
- The Engine is "off'
- An automatic transaxle is in "PARK" or "NEUTRAL"
- A manual transaxle is out of gear (in "NEUTRAL")
- There is high engine RPM (fuel cut-off)
- There is high vehicle speed (fuel cut-off)
- The PCM sets the following DTCs:
DTC 19 (CRANK SENSOR)
DTC 53 (UNDER/OVER BATTERY VOLTAGE)
DTC 65 (FUEL INJECTOR)
- A four speed automatic transaxle or Smart Cluster equipped car is in "REVERSE"
- A four speed automatic transaxle equipped car's PCM sets the following DTCs:
DTC 24 (VSS)
DTC 21 or 22 (TPS ACTIVE)
- The ETS (Enhanced Traction System) is active (4-Spd Auto & Pontiac only)
An electronic Controller and Electric Motor are contained in the Cruise Control Module. The Controller monitors vehicle speed and operates the Electric Motor. In response to the Controller, the motor moves a connecting strap that is attached to the Cruise Control Cable. The Cable moves the Throttle Linkage to vary throttle position in order to maintain the desired cruise speed. The Cruise Control Module contains a low speed limit which will prevent system engagement below a minimum speed, approximately 25 mph. The module is controlled by mode control switches located on the Multi-Function Lever. Cruise Control is in "Standby Disabled" mode until all conditions inconsistent with Cruise Control operation are cleared.
With the Ignition Switch in "RUN," battery voltage is applied to terminal "F" of the Cruise Control Module. When the Slider Switch is moved to the "ON" position, battery voltage is applied to terminal "A" of the Cruise Control Module Connector. If the brake pedal is not depressed, battery voltage is present at module terminal "D". If the brake pedal is depressed, battery voltage is present at module terminal "G". Terminal "G" must see current flow for the cruise to operate (disable) properly. When the Slider Switch is moved to the "R/A" position, battery voltage is applied to terminal "C" of the module. With the Set Switch depressed, battery voltage is present at module terminal"B". Cruise Control Module Connector terminal "K" is the speed signal terminal. In operation, voltage will oscillate between a high of battery voltage and a low of near 0.5 volts. Ground is at module terminal "E". Terminal "J" is used to signal the Powertrain Control Module (PCM) when Cruise Control is "engaged." The PCM will then determine the correct shift pattern for the transmission. Terminal "H" is used by the PCM to "Inhibit" Cruise Control when conditions not consistent with cruise operation are present. These are Cruise Control Inhibit Criteria.
The PCM will "Inhibit" Cruise Control when:
- The Engine is "off'
- An automatic transaxle is in "PARK" or "NEUTRAL"
- A manual transaxle is out of gear (in "NEUTRAL")
- There is high engine RPM (fuel cut-off)
- There is high vehicle speed (fuel cut-off)
- The PCM sets the following DTCs:
DTC 19 (CRANK SENSOR)
DTC 53 (UNDER/OVER BATTERY VOLTAGE)
DTC 65 (FUEL INJECTOR)
- A four speed automatic transaxle or Smart Cluster equipped car is in "REVERSE"
- A four speed automatic transaxle equipped car's PCM sets the following DTCs:
DTC 24 (VSS)
DTC 21 or 22 (TPS ACTIVE)
- The ETS (Enhanced Traction System) is active (4-Spd Auto & Pontiac only)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.