Cruise Control Description and Operation w/o ETC
Cruise control is a speed control system that maintains
a desired vehicle speed under normal driving conditions. However, steep grades
may cause variations in the selected speeds. The electronic cruise control
system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE,
and TAP-UP or TAP-DOWN.
The main parts of the cruise control system are:
| • | The cruise control module assembly |
| • | The function control switches |
| • | The cruise control release switch |
| • | The clutch pedal position switch (CPP), if equipped |
| • | The stoplamp switch assembly |
| • | The vehicle speed sensor |
The cruise control system uses the cruise control module assembly to
maintain the desired vehicle cruise speed and operation. The cruise control
module assembly has an electronic controller and an electric stepper motor
to vary the throttle in each different cruise control mode. The electric
controller monitors vehicle speed and operates the electric stepper motor.
The stepper motor operates in response to the electronic controller, to
maintain the desired cruise speed. The electric stepper motor moves a strap
that is attached to the cruise control cable which moves the throttle
linkage. The cruise control module assembly contains a low speed limit which
will prevent system engagement below a minimum speed of 40 km/h (25 mph).
The module assembly is not serviceable.
The operation of the electronic controller is controlled by the function
control switches located on the multifunction turn signal lever. The cruise
control functional control switches include the ON/OFF, SET/COAST and R/A
(resume/accelerate) switch. The switch assembly provides driver control
of the cruise control system.
The stop lamp switch controls both the cruise control release signal
and stoplamp signal. These signal circuits are used to disengage the cruise
control. The stoplamp switch assembly is mounted on the brake pedal bracket.
To disengage the system electrically the driver presses the brake pedal.
The speed of the vehicle at brake actuation will be stored in the memory
of the cruise module.
With cruise control, you can maintain a speed of about 40 km/h
(25 mph) or more without keeping your foot on the accelerator. When
the driver turns off the on/off switch, or the ignition switch, the cruise
control turns off. The vehicle speed stored in the memory of the cruise
module will be lost.
Ignition positive voltage is supplied from the cruise fuse,
to the cruise control module and cruise control switch. The cruise control
module is grounded to the chassis. When the cruise control ON/OFF switch
is on, ignition positive voltage is applied to the cruise on switch signal
circuit of the cruise control module. If the driver has not pressed the
brake pedal, ignition positive voltage is supplied through the cruise
control release circuit, to the cruise control release signal terminal
of the cruise control module. On vehicles equipped with a manual transmission,
a clutch switch is wired in series on this circuit and operates the same.
When the driver presses the brake pedal, battery positive voltage is supplied
from the stop lamp fuse, through the closed stop lamp switch to the stop
lamp switch signal terminal of the cruise control module. As this operation
occurs, ignition positive voltage is removed from the cruise release signal
circuit. If equipped, voltage is also removed from the cruise release signal
circuit when the clutch pedal is pressed. When the SET/COAST is pressed
on the control switch, ignition positive voltage is applied to the set/coast
switch signal terminal of the cruise control module. When pressing the
R/A (resume/accelerate) on the control switch, ignition positive voltage
is applied to the resume/ accelerate switch signal terminal of the cruise
control module.
The cruise control module receives a vehicle speed signal input from
the Powertrain Control Module (PCM). In operation, the voltage varies between
0 V and 5 V.
After the cruise control engage criteria has been met and the cruise
ON and Set/Coast have been commanded, the cruise control module sends a signal
to the PCM that the cruise control is engaged. The PCM then sends a class
2 message to the instrument panel cluster (IPC) to illuminate the cruise
light, if equipped.
The PCM will inhibit cruise control under the following conditions:
| • | Vehicle speed is less than 40 km/h (25 mph). |
| • | In PARK, REVERSE, NEUTRAL, or 1st gear |
| • | High engine RPM (fuel cut-off) |
| • | Vehicle speed is too high. |
| • | An over or under charged battery voltage condition exists. |
| • | Antilock brake system/traction control system is active for more
than 2 seconds. |
If the PCM determines that any of the cruise control inhibit conditions
are present, the PCM will disengage the cruise control.
Cruise Control Description and Operation w/ ETC
Cruise control is a speed control system that maintains
a desired vehicle speed under normal driving conditions. However, steep grades
may cause variations in the selected speeds. The electronic cruise control
system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and
TAP-UP or TAP-DOWN.
The main parts of the cruise control system are:
| • | The Throttle Actuator Control Module (TAC) |
| • | The function control switches |
| • | The stoplamp switch assembly |
| • | The clutch pedal position sensor (CPP) |
The cruise control system uses the TAC module to maintain the desired
vehicle cruise speed and operation. The TAC and the powertrain control module
(PCM) communicate together to vary the throttle opening in each different
cruise control mode. The PCM monitors vehicle speed and operates the throttle
actuator. The throttle actuator operates in response to the TAC module,
to maintain the desired cruise speed. The throttle actuator motor moves
the throttle blade. The PCM assembly contains a low speed limit which will
prevent system engagement below a minimum speed of 40 km/h (25 mph).
The TAC or PCM module assembly are not serviceable.
The operation of the TAC module is through the function control switches
located on the multifunction turn signal lever. The cruise control function
control switches includes the ON/OFF, SET/COAST, R/A (resume/accelerate).
The switch assembly provides driver control of the cruise control system.
The multiple function stop lamp switch or CPP switch if equipped, is
used to disengage the cruise control. A cruise control release switch circuit
and a stoplamp switch circuit are used. The stop lamp and CPP switches
are mounted to the brake pedal bracket . To disengage the system the driver
presses the brake pedal or clutch pedal, if equipped. The speed of the
vehicle at brake actuation will be stored in the memory of the TAC module.
With cruise control, the vehicle can maintain a speed of about 40 km/h
(25 mph) or more without keeping your foot on the accelerator. When the driver
turns off the cruise control ON/OFF switch or ignition switch, the cruise
control turns off. The vehicle speed stored in the memory of the TAC module
will be lost.
Ignition positive voltage is supplied from the ETC fuse,
to the TAC module. The TAC module is grounded to G103. When the cruise control
ON/OFF switch is on, ignition positive voltage is applied to the cruise
on switch signal terminal of the TAC module. If the driver has not pressed
the brake pedal or clutch pedal if equipped, ignition positive voltage is
supplied through the switches, to the cruise control brake pedal switch
signal and clutch signal, if equipped, terminals of the PCM. Cruise control
is canceled when the driver presses either the brake pedal or clutch pedal,
if equipped. The stop lamp switch closes, applying battery positive voltage
to the stop lamp signal circuit of the TAC module. Voltage is also removed
from the brake pedal signal circuit and the clutch switch signal circuit,
if equipped, at the PCM. When pressing the SET/COAST button on the multifunction
turn signal lever, ignition positive voltage is applied to the set/coast
switch signal terminal of the TAC module. When pressing the R/A (resume/accelerate)
on the control switch, ignition positive voltage is applied to the resume/accelerate
switch signal terminal of the TAC module.
When the cruise switch is in the ON position, and the driver presses
the SET/COAST button, the TAC module notifies the PCM that the cruise control
is requested. The PCM then checks to see that the cruise control enable
criteria is met. If the cruise control criteria has been met the PCM sends
a class 2 message to the instrument panel cluster (IPC) to illuminate the
cruise light, if equipped
The PCM will inhibit cruise control:
| • | When vehicle speed is less than 40 km/h (25 mph). |
| • | When in PARK, REVERSE, NEUTRAL, or 1st gear. |
| • | With high engine RPM (fuel cut-off) |
| • | When vehicle speed is too high |
| • | When an over or under charged battery voltage condition exists |
| • | Antilock brake system/traction control system is active for more
than 2 seconds |
If the PCM determines that any of the cruise control inhibit conditions
are present, the PCM will disengage the cruise control. The PCM accomplishes
this through data communication with the TAC module. If the PCM disables
the cruise control for an inhibiting event it will record the reason for
disengagement in the Disengage Definition data file.
Cruise Control Description and Operation Diesel
Cruise control is a speed control system that maintains
a desired vehicle speed under normal driving conditions. However, steep grades
may cause variations in the selected speeds. The electronic cruise control
system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and
TAP-UP or TAP-DOWN.
The main parts of the cruise control system are:
| • | The powertrain control module (PCM) |
| • | The function control switches |
| • | The stoplamp switch assembly |
| • | The clutch pedal position sensor (CPP), if equipped |
The cruise control system uses the PCM to maintain the desired vehicle
cruise speed and operation and to vary the throttle opening in each different
cruise control mode. The PCM also monitors vehicle speed and cruise control
operation. The throttle actuator operates in response to the PCM, to maintain
the desired cruise speed. The throttle actuator motor moves the throttle
blade. The PCM assembly contains a low speed limit which will prevent system
engagement below a minimum speed of 40 km/h (25 mph). The PCM assembly
is not serviceable.
Cruise control operation is obtained through the function control switches
located on the multifunction turn signal lever. The cruise control function
control switches include the ON/OFF, SET/COAST, R/A (resume/accelerate).
The switch assembly provides driver control of the cruise control system.
The multiple function stop lamp switch or CPP switch if equipped, is
used to disengage the cruise control. A cruise control release switch circuit
and a stoplamp switch circuit are used. The stop lamp and CPP switches
are mounted to the brake pedal bracket . To disengage the system the driver
presses the brake pedal or clutch pedal, if equipped. The speed of the
vehicle at brake actuation will be stored in the memory of the TAC module.
With cruise control, the vehicle can maintain a speed of about 40 km/h
(25 mph) or more without keeping your foot on the accelerator. When the driver
turns off the cruise control ON/OFF switch or ignition switch, the cruise
control turns off. The vehicle speed stored in the memory of the PCM will
be lost.
Ignition positive voltage is supplied from the cruise fuse,
to the cruise control switch. The PCM is grounded to G103. When the cruise
control ON/OFF switch is on, ignition positive voltage is applied to the
cruise on switch signal terminal of the PCM . If the driver has not pressed
the brake pedal or clutch pedal if equipped, ignition positive voltage is
supplied through the stop lamp switch, to the TCC/Brake pedal switch signal
and clutch pedal position signal, if equipped, terminals of the PCM. Cruise
control is canceled when the driver presses either the brake pedal or clutch
pedal, if equipped. The stop lamp switch closes, applying battery positive
voltage to the stop lamp signal circuit of the PCM . Voltage is also removed
from the TCC/Brake pedal signal circuit and the clutch switch signal circuit,
if equipped, at the PCM. When pressing the SET/COAST button on the multifunction
turn signal lever, ignition positive voltage is applied to the set/coast
switch signal terminal of the PCM. When pressing the R/A (resume/accelerate)
on the control switch, ignition positive voltage is applied to the resume/accelerate
switch signal terminal of the PCM.
When the cruise switch is in the ON position, and the driver presses
the SET/COAST button, the switch signal notifies the PCM that the cruise control
is requested. The PCM then checks to see that the cruise control enable
criteria is met. If the cruise control criteria has been met the PCM engages
cruise control and sends a class 2 message to the instrument panel cluster
(IPC) to illuminate the cruise light, if equipped
The PCM will inhibit cruise control:
| • | Vehicle speed is less than 40 km/h (25 mph). |
| • | In PARK, REVERSE, NEUTRAL, or 1st gear |
| • | High engine RPM (fuel cut-off) |
| • | Vehicle speed is too high. |
| • | An over or under charged battery voltage condition exists. |
| • | Antilock brake system/traction control system is active for more
than 2 seconds. |
If the PCM determines that any of the cruise control inhibit conditions
are present, the PCM will disengage the cruise control. If the PCM disables
the cruise control for an inhibiting event it will record the reason for
disengagement in the Disengage Definition data file.
