ISUZU TF SERIES 2004 Workshop Manual

CRUISE CONTROL SYSTEM 8B-3
Service Precaution
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL RESTRAIN SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS COMPONENTS OR THE SRS WIRING. WHEN YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS COMPONENTS OR THE SRS WIRING, REFER TO THE SRS
SERVICE INFORMATION. FAILURE TO FOLLOW WARNINGS COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR OTHER WISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the proper location. When you replace a faster, use ONLY the
exact part number for that application. Dealer will call out those fasteners that require a replacement after
removal. Dealer will also call out the fasteners that require thread lockers or thread sealant. UNLESS
OTHERWISE SPECIFIED, do not use supplemental coatings (Paints, greases, or other corrosion inhibitors)
on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener
torque and joint Clamping force, and may damaged the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following these instructions can help you avoid damage to
parts and systems.

General Description
The cruise control keeps the vehicle running at a fixed speed until a signal canceling this fixed speed is received.
When the main switch “AUTO CRUISE” is turned on with the vehicle in the running mode, the battery voltage is
applied to the control unit. When a signal from the control unit while the vehicle is in this state, the cruise control
actuator is activated to operate the system. Also, while the system is operating, the “AUTO CRUISE” indicator light
in the meter assembly lights up.





LTW48BSH000101
1. SET/COAST Switch Function
1. Set Function: When the SET/COAST switch is pressed and released with the main switch on, the speed at
which the vehicle is running at that moment is stored in the memory, and the vehicle automatically runs at the
stored speed.
2. COAST-down Function: When the SET/COAST switch is kept on while the vehicle in running, the vehicle
decelerates during that time. The speed at which vehicle is running when the control switch is pressed in the
memory, and the vehicle automatically returns to the stored speed.
3. Tap-down Function: When the SET/COAST switch is pressed and released instantaneously while the
vehicle is running, the vehicle decelerates a mile for each on/off operation. The vehicle speed at which the
vehicle was running when the SET/COAST was released last is stored in the memory, and the vehicle
automatically returns to this stored speed.

8B-4 CRUISE CONTROL SYSTEM
2. RESUME/ACCEL Switch Function
1. Resume Function: When the RESUME/ACCEL switch is turned on/off after the system is temporarily
deactivated by pressing the brake or clutch pedal while the vehicle is running, the vehicle resumes the speed
stored before the system was released, and the vehicle automatically runs at the stored speed.
2. Accelerate Function: When the RESUME/ACCEL switch is kept on the vehicle accelerates its speed during
that time. The vehicle speed at which the vehicle was running when the switch was turned off is stored in the
memory, and the vehicle automatically returns to this speed.
3. Tap-up Function: When the RESUME/ACCEL switch is turned on and off instantaneously while the vehicle
is running, the vehicle decelerates a mile for each on/off operation. The vehicle speed at which the vehicle
was running when the switch was turned off last is stored in the memory, and the vehicle automatically
returns to this stored speed.

3. CANCEL Function
1. Temporary Cancellation:

Brake pedal is pressed.

Clutch pedal is pressed. (M/T)

Select lever is shifted to any position other than “D”, “3”, “2” or “L”. (A/T)

Cancel switch is operated.

Vehicle speed exceeds about 12.5mph over the vehicle speed stored in the memory.
Turning the RESUME/ACCEL switch will return the vehicle to the speed stored in the cruise control memory.
2. Complete Cancellation:

Starter switch or the main switch is turned off.

Fail-safe function is activated.

Vehicle speed is about 38 km/h mph.

Speed becomes 20 (12.5) km/h (mph) or less form the speed memorized by Control unit.

CRUISE CONTROL SYSTEM 8B-5
Brake Switch






RTW3A0MH000101

Removal
1. Disconnect the battery ground cable.
2. Remove the brake switch.

Disconnect the connector (1).

Loosen lock nuts of the switch (2).

Remove the switch by turning it (3).



Installation
To install, follow the removal steps in the reverse order, noting
the following points.
1. Check to see if the brake pedal has been returned by the
return spring to the specified position.
2. Turn the switch clock-wise until the tip of the threaded
portion of the brake switch contacts the pedal arm.



RTW3A0SH000901

3. Turn the switch counter-clock-wise until the space between
the tip of the threaded portion and the pedal arm is 0.2 to
1.2 mm (0.01-0.06 in.) as shown in the figure.

8B-6 CRUISE CONTROL SYSTEM
Adjustment
1. Check to be sure that the brake pedal has been completely
returned by the return spring.
2. Disconnect the switch connector.



RTW3A0SH001201

3. Release the lock (2) by turning the switch (1) counter-clock-
wise.
4. After doing so, pull the pedal arm (3) to you a little so tha
t
the pedal arm is not pushed in.
5. Making the pedal arm not movable with one hand, push in
the whole switch with the other hand until the plunger of the
switch is pushed in and the switch itself hits the rubber o
f
the pedal arm.
In the condition, turn the switch clock-wise until "click"
sound is made and lock it.
By doing this, the switch is adjusted at 0.2 to 1.2mm (0.01-
0.06 in.) clearance.

Clutch Switch


Removal and Installation
Refer to the Clutch Control removal and installation steps in
Clutch section.

Adjustment
1. Turn the clutch switch or stopper bolt 1 until the switch bolt
or stopper bolt just touches the clutch pedal arm.
2. Adjust clutch switch or stopper bolt by backing it out half a
turn, and measure the clearance (L) between the clutch
pedal arm and the clutch switch bolt end or stopper bolt.
3. Lock the lock nut
2.
4. Connect the clutch switch connector.

Clutch switch and clutch and clutch pedal clearance
mm (in)

Limit 0.5-1.5 (0.020-0.059)


Starter Switch

431R300001
Removal
1. Steering Lock Assembly

Refer to the Steering Lock assembly removal steps o
f
"Steering Column" in Power-Assisted Steering System
section.
2. Starter Switch

Installation
Follow the removal procedure in the reverse order to install the
starter switch.

CRUISE CONTROL SYSTEM 8B-7
Cruise Control Main Switch



Removal
1. Disconnect the battery ground cable.


RTW3A0SH001301
2. Remove the side ventilation grille.



RTW3A0SH001401
3. Disconnect the switch connector and push the lock from the
backside of the side ventilation grille to remove the cruise
control main switch.


Installation
To install, follow the removal steps in the reverse order, noting
the following point.
1. Push in the switch with your fingers until it locks securely.

Cruise Control Switch (Combination Switch)


Removal and Installation
Refer to the Lighting Switch (Combination Switch) removal and
installation steps of Lighting System in Body and Accessories
section.

8B-8 CRUISE CONTROL SYSTEM
Cruise Control Unit




RTW3A0SH001101
Removal
1. Disconnect the battery ground cable.
2. Remove the dash side trim panel (LH) (1).
3. Disconnect the connector.
4. Remove a fixing nut to remove the cruise control unit (2).

Installation
To install, follow the removal steps in the reverse order.

Cruise Actuator

Actuator Cable Diagram





RTW3A0SF000301
Legend
(1) Cruise Actuator Assembly
(2) Cruise Control Cable

(3) Accelerator Cable
(4) Throttle Link (Cruise Control Side)

CRUISE CONTROL SYSTEM 8B-9


RTW3A0SH001001
Removal
1. Disconnect the battery cable.
2. Remove the cruise actuator Assembly (4).

Disconnect the connector (3).

Remove the cable end (1) from the throttle link (cruise
control side).

Loosen a fixing nut of the cruise control cable (2).

Remove fixing screws of the actuator (5).


Installation
To install, follow the removal steps in the reverse order, noting
the following point.
1. Take care not to bend the cable excessively.





RTW3A0SH001501
Adjustment
After installing the cruise actuator, the following steps must be
carried out for cruise control cable adjustment.
1. Install the cruise control cable end (3) to the throttle link (4).
2. Put the screw portion of the cable in the bracket (5).
3. Put the nut (1) to the bracket and then tighten the nut (2).
CAUTION: Don't move a position of the nut (1) from
supplied condition.
4. If the distance between the throttle link (4) and the throttle
link lever (6) is out of the specified range, loosen the nut (2)
to adjust it.

Mode Switch


Removal and Installation
Refer to the Mode Switch removal and installation steps in
Automatic Transmission section.

8B-10 CRUISE CONTROL SYSTEM
Diagnosis
The cruise control unit uses the cruise main indicator light and diagnosis the failure, when the control unit detects
abnormality on the table below.

PART POSSIBLE CAUSE DETECTION PERIOD DTC
Actuator Motor system short circuit Energizing motor 1-1
Clutch system short circuit Energizing clutch 1-2
Clutch system open circuit Energizing clutch 1-2
Mechanical defect Cruise controlling 1-3
Close side of motor system open circuit Cruise controlling 1-1
Cruise control unit Close side of motor system open circuit While starter sw on 1-4
Clutch output abnormality While starter sw on 1-4
Vehicle speed sensor Signal of vehicle speed disconnection Cruise controlling 2-1
Signal of vehicle speed abnormality Cruise controlling 2-1
Switch Turning on switch at all times While starter sw on 3-1
Turning on switch at the same time While starter sw on 3-1
DTC : Diagnostic Trouble Code

DTC Display Condition
1. With the vehicle stationary and the ignition ON, activate the ‘Cruise Cancel’ switch three times within 2 seconds.
2. If there are no DTC’s stored in the Cruise control unit, the LED on the Cruise Main switch will blink rapidly (2Hz).
3. Any DTC’s stored in the Cruise control unit will be displayed by the CRUISE SET warning lamp in the meter
cluster.
4. Read the set DTC’s by referring to then charts on this page.

NOTE:

The DTC display mode will be aborted if either the vehicle speed rises above 10km/h or the RESUME switch is
operated.

The control module stores the DTC in a ‘volatile’ memory – that is the memory is only active while the ignition is
ON.
Turning the ignition to the OFF position will clesr any stored DTC’s.

CRUISE CONTROL SYSTEM 8B-11
DTC Display Format
1. When no DTCs are detected. (The unit : sec.)







F08RW003
2. When two or more DTCs are detected. (The unit : sec.)






F08RW009

8B-12 CRUISE CONTROL SYSTEM

CIRCUIT DIAGRAM



RTW48AXF003801