clutch ISUZU KB P190 2007 Workshop Repair Manual
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CRUISE CONTROL SYSTEM 8B-1
SECTION 8B
CRUISE CONTROL SYSTEM
TABLE OF CONTENTS
PAGE
General Description ...................................................................................................................... 8B- 2
Brake Switch ................................................................................................................................... 8B- 4
Removal ....................................................................................................................................... 8B- 4
Installation .................................................................................................................................. 8B- 4
Adjustment ................................................................................................................................. 8B- 5
Clutch switch .................................................................................................................................. 8B- 5
Removal and Installation ........................................................................................................ 8B- 5
Adjustment ................................................................................................................................. 8B- 5
Starter Switch ................................................................................................................................. 8B- 5
Removal and Installation ........................................................................................................ 8B- 5
Cruise Control Main Switch ........................................................................................................ 8B- 6
Removal ....................................................................................................................................... 8B- 6
Installation .................................................................................................................................. 8B- 6
Cruise Control Switch (Combination Switch) ........................................................................8B- 6
Removal and Installation ........................................................................................................ 8B- 6
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8B-2 CRUISE CONTROL SYSTEM
General Description
The cruise control keeps the vehicle running at a fixed speed until a signal canceling this fixed speed is received.
W hen the main switch “AUTO CRUISE” is turned on with the vehicle in the running mode, the battery voltage is
applied to the control unit (Engine control module). W hen 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 cruise
control set indicator light in the meter assembly lights up.
RTU7Z0SH019601
1. SET/COAST Switch Function
1. Set Function: W hen 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: W hen 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: W hen 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.
2. RESUME/ACCEL Switch Function
1. Resume Function: W hen 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: W hen 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: W hen 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.
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Page 5575 of 6020
CRUISE CONTROL SYSTEM 8B-3
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 20 km/h 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.
• Speed becomes 20 km/h or less form the speed memorized by control unit.
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Page 5577 of 6020
CRUISE CONTROL SYSTEM 8B-5
Adjustment
1. Check to be sure that the brake pedal has been completely
returned by the return spring.
2. Disconnect the switch connector.
RTW 780SH003301
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 that
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 procedure
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 pedal clearance
mm (in)
Clearance 0.5-1.5 (0.020-0.059)
Starter Switch
431R300001
Removal and Installation
Refer to the Starter Switch removal and installation procedure
of Start and Charging in Body and Chassis section.
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Page 5579 of 6020
Cruise Control – HFV6 Page 8C–1
8C
Cruise Control – HFV6
ATTENTION
Before performing any Service Operation or other procedure described in this Section, refer to General Information Warnings, Cautions and Notes for correct workshop practices with regard to safety and/or property damage.
1 General Information ...............................................................................................................................3
1.1 WARNINGS, CAUTIONS and NOTES................................................................................................... ................. 3
Definition of WARNING, CAUTION and NOTE Statements ............................................................................. .... 3
WARNING Defined............................................................................................................................................. 3
CAUTION Defined .............................................................................................................................................. 3
NOTE Defined .................................................................................................................................................... 4
1.2 System Components .............................................................................................................. ............................... 4
Cruise Control Switch Assembly ................................................................................................. ....................... 5
Instrument Cluster Assembly ............................................................................................................................. 5
Clutch Pedal Switch (Manual Only) .............................................................................................. ...................... 5
Stop Lamp Switch Assembly .............................................................................................................................. 5
Powertrain Interface Module .............................................................................................................................. 6
Engine Control Module ....................................................................................................................................... 6
Throttle Actuator Control (TAC) Assembly ....................................................................................... .................. 6
1.3 System Operation .................................................................................................................................................. 6
Preliminary Information......................................................................................................................................... 6
Enabled and Disabled ........................................................................................................... ............................. 6
Activated and Deactivated...................................................................................................... ............................ 7
Enabling the Cruise Control.................................................................................................... .............................. 7
Brake Before Cruise .............................................................................................................................................. 7
Activating the Cruise Control .................................................................................................. ............................. 7
Deactivating the Cruise Control ................................................................................................ ........................... 7
Pressing the Brake Pedal ................................................................................................................................... 7
Pressing the Cruise ON–OFF Button .............................................................................................. ................... 8
Rotating the Cruise Control Switch Assembly .................................................................................... ................ 8
Pressing the Clutch Pedal (Manual Vehicles Only) ............................................................................... ............. 8
Decelerating While Cruise Control is Activated ................................................................................. ................. 8
Resuming a Speed After Cruise Control Has Been Deactivated ..................................................................... .. 8
Accelerating While Cruise Control is Activated .................................................................................................. 8
Using the Cruise Control Switch Assembly ........................................................................................................ 8
Pressing the Accelerator Pedal .......................................................................................................................... 8
2 Diagnostics .............................................................................................................................................9
2.1 Diagnostic General Information............................................................................................................................ 9
Basic Knowledge Required ................................................................................................................................... 9
Basic Diagnostic Tools Required ......................................................................................................................... 9
Tech 2 Data List ................................................................................................................................................... 10
2.2 Diagnostic Systems Check ....................................................................................................... .......................... 10
Diagnostic Systems Check ................................................................................................................................. 10
2.3 Wiring Diagrams .................................................................................................................................................. 12
2.4 Cruise Control Inoperative / Malfunctioning.................................................................................... .................. 14
Circuit Description ............................................................................................................................................ 14
Manual Vehicles Only........................................................................................................... ............................ 14
Test Description ............................................................................................................................................... 14
Diagnostic Table Notes ......................................................................................................... ........................... 14
Diagnostic Table............................................................................................................................................... 14
SECTION
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Page 5580 of 6020
Cruise Control – HFV6 Page 8C–2
3 Service Operations ...............................................................................................................................20
3.1 Cruise Control Main Switch ..................................................................................................... ........................... 20
Remove ................................................................................................................................................................. 20
Test ....................................................................................................................................................................... 20
Terminal Testing............................................................................................................................................... 20
Reinstall ................................................................................................................................................................ 20
3.2 Cruise Control Switch Assembly........................................................................................................................ 21
Remove ................................................................................................................................................................. 21
Test ....................................................................................................................................................................... 21
Terminal Testing............................................................................................................................................... 21
Reinstall ................................................................................................................................................................ 21
3.3 Stop Lamp Switch Assembly .............................................................................................................................. 22
Remove ................................................................................................................................................................. 22
Test ....................................................................................................................................................................... 22
Terminal Testing............................................................................................................................................... 22
Reinstall ................................................................................................................................................................ 22
3.4 Clutch Pedal Switch (Manual Only) .................................................................................................................... 24
Remove ................................................................................................................................................................. 24
Test ....................................................................................................................................................................... 24
Reinstall ................................................................................................................................................................ 25
4 Special Tools ........................................................................................................................................26
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ISUZU KB P190 2007
Page 5582 of 6020
Cruise Control – HFV6 Page 8C–4
NOTE Defined
A NOTE statement immediately precedes or follows an operating procedure, maintenance practice or condition that
requires highlighting. A NOTE statement also emphasises necessary characteristics of a diagnostic or repair procedure.
A NOTE statement is designed to:
• Clarify a procedure,
• Present additional information for accomplishing a procedure,
• Give insight into the reasons for performing a procedure in the recommended manner, and / or
• Present information that gives the technician the benefit of past experience in accomplishing a procedure with
greater ease.
1.2 System Components
The main components of the electronic cruise control system are:
• cruise control ON / OFF switch (in dash panel).
• cruise control switch assembly (incorporated into wiper and washer switch assembly),
• instrument cluster assembly (cruise set lamp),
• clutch pedal switch assembly (manual transmission vehicles only),
• stop lamp switch assembly,
• powertrain interface module (PIM),
• engine control module (ECM),
• throttle actuator control (TAC) assembly, and
• electrical wiring (incorporated into the main wiring harness).
Figure 8C – 1
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Cruise Control – HFV6 Page 8C–5
Legend
1 Engine Control Module
2 Throttle Actuator Control (TAC) Assembly
3 Cruise Control Switch Assembly
4 Instrument Cluster Assembly 5 Cruise Control ON / OFF Switch
6 Powertrain Interface Module
7 Clutch Pedal Switch Assembly (Manual Only)
8 Stop Lamp Switch Assembly
Cruise Control Switch Assembly
The cruise control switch assembly is located on the end of
the wiper and washer switch assembly.
• For harness routing from the cruise control switch
assembly to the powertrain interface module, refer to
8A Electrical – Body and Chassis.
• For wiring and to see how the switch integrates into
the system, refer to 2.3 W iring Diagrams.
Figure 8C – 2
Instrument Cluster Assembly
The instrument cluster assembly displays the status of the cruise control system as well as other information via the
warning indicators.
Figure 8C – 3
Clutch Pedal Switch (Manual Only)
This switch assembly is attached to the clutch pedal support bracket. The switch is normally closed when the clutch
pedal is at rest, opening when the pedal is pressed. Activation of this switch removes the signal to the ECM, which will
then deactivate the cruise control.
Stop Lamp Switch Assembly
The stop lamp switch assembly is located on the brake pedal support bracket. This switch has two sets of contacts with
two independent functions. The function of the switch assembly in the cruise control system is to deactivate the cruise
control when the brake pedal is pressed as well as an initial safety check of the switch operation prior to activating cruise
control.
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Page 5585 of 6020
Cruise Control – HFV6 Page 8C–7
Activated and Deactivated
When the cruise control is enabled, the vehicle speed must be above 40 km/h and the cruise control switch assembly
pressed to SET–COAST, the cruise control will be activated and the vehicle will maintain the set speed. When
deactivated by the methods described within this section, the vehicle will no longer maintain the set speed, but the cruise
control will still be engaged.
Cruise Active
When the cruise control is activated via the cruise control
switch assembly, the cruise set warning lamp will illuminate
the instrument cluster assembly.
Cruise Deactivated
Upon receiving a signal to deactivate the cruise control the
ECM will provide a signal to the instrument cluster, via the
PIM, to inform the user the cruise control is deactivated.
When the cruise control is deactivated via the cruise control
switch assembly, the brake pedal, or the clutch pedal, the
cruise set warning lamp will turn OFF within the instrument
cluster assembly.
Figure 8C – 5
Enabling the Cruise Control
Refer to 2.3 Wiring Diagrams for the following description.
W hen the cruise control ON-OFF button is pressed, 12 V is applied to the powertrain interface module (PIM) connector
B – 97 pin 14. This informs the PIM the user has requested the cruise control function be engaged or disengaged. This
signal is then output by the PIM as GM LAN protocol along the bus to the engine control module (ECM). The ECM
recognises the command from the PIM to engage the cruise control. The PIM then provides a ground signal to B – 97 pin
13 the cruise control ON-OFF switch indicator lamp, to inform the user the cruise control is engaged.
Brake Before Cruise
Before the cruise control can be activated the driver must have applied the brakes and the system received a valid
response at least once per ignition cycle. If the driver manages to drive the vehicle without having used the brakes before
pressing the cruise control ON–OFF button, the cruise control cannot be activated.
Activating the Cruise Control
The user activates the cruise control at a desired speed above 40 km/h by pressing the cruise control switch assembly
SET–COAST button. This provides a 12 V signal to the PIM through connector B – 97 pin 15. The PIM then outputs this
signal as GM LAN protocol through the data bus to the ECM. If the ECM already has cruise control engaged, upon
receipt of the message from the PIM, the ECM will activate cruise control and set the speed. The ECM receives all the
various inputs required to maintain the correct speed and then controls the throttle actuator control assembly depending
on the load on the engine (ascending or descending hills, etc).
Deactivating the Cruise Control
When the cruise control is activated, it can be deactivated by any of the following:
Pressing the Brake Pedal
When the brake pedal is pressed, two signals are sent directly to the ECM by the circuits from the brake pedal switch
assembly. The cruise cancel circuit will open (normally closed) thus dropping the supply voltage from the ECM connector
C – 56 pin 46. Simultaneously, the stop lamp circuit will close (normally open) and supply 12 V to the ECM at connector
C – 56 pin 10. This is a double redundancy system so that if either switch or circuit from the brake pedal switch assembly
fails, the cruise control will still be deactivated.
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Page 5586 of 6020
Cruise Control – HFV6 Page 8C–8
Pressing the Cruise ON–OFF Button
Pressing the cruise control switch assembly ON–OFF button will send a signal via the PIM to the ECM to deactivate the
cruise control.
Rotating the Cruise Control Switch Assembly
Rotating the cruise control switch assembly to the CANCEL position will send a signal via the PIM to the ECM to
deactivate the cruise control.
Pressing the Clutch Pedal (Manual Vehicles Only)
When the clutch pedal is pressed, the cruise control cancel circuit will open (normally closed) thus removing the supply
voltage from the ECM connector C – 56 pin 53. The ECM then deactivates the cruise control.
Decelerating While Cruise Control is Activated
When the cruise control is activated, the speed can be reduced by pressing and holding the cruise control switch
assembly to SET–COAST. When this is done, 12 V is applied to PIM connector B – 97 pin 15. The PIM will then translate
the command to GM LAN protocol and sends the request to the ECM to reduce the speed. The ECM will then
temporarily disable the cruise control and close the throttle plate. The vehicle should then start to decelerate. Once the
operator releases the cruise control switch assembly, the ECM will receive this signal through the PIM and will then set
the speed according to the current VSS and maintain that speed.
Resuming a Speed After Cruise Control Has Been Deactivated
If the cruise control system is engaged but deactivated, the last speed at which it was activated can be resumed. Turning
the cruise control switch assembly to RES–ACC will apply 12 V to the PIM at connector B – 97 pin 16. The PIM will then
translate the command to GM LAN protocol and transmit the request to the ECM. The ECM will then recall the last stored
speed at which the cruise control was activated and increase or reduce engine RPM to maintain that speed.
Accelerating While Cruise Control is Activated
Using the Cruise Control Switch Assembly
When the cruise control is active, rotating the cruise control switch assembly to RES–ACC will accelerate the vehicle.
The cruise control switch assembly will supply a 12 V signal to the PIM connector B – 97 pin 16, which is continuous as
long as the switch is held. While the PIM is receiving the 12 V signal, it will continuously transmit to the ECM to
accelerate the vehicle. The ECM will open the throttle plate to accelerate the vehicle. When the desired speed is
achieved and the cruise control switch assembly is released, the ECM will maintain the vehicle at that speed.
Pressing the Accelerator Pedal
When the cruise control is active, pressing the accelerator pedal will accelerate the vehicle.
Once pressure is removed from the accelerator pedal, the vehicle will return to the last stored speed at which the cruise
control was activated and control the throttle plate to maintain that speed.
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