2007 ISUZU KB P190 CIRCUIT DIAGRAM

ELECTRICAL-BODY AND CHASSIS 8A-603

CIRCUIT DIAGRAM HFV6 (RHD) Sheet 2/2




RTW 78AXF000601

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

8A-604 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM HFV6 (LHD) Sheet 1/2


RTW 78AXF013401

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

ELECTRICAL-BODY AND CHASSIS 8A-605

CIRCUIT DIAGRAM HFV6 (LHD) Sheet 2/2


RTW 78AXF013501


BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

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
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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.

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

Cruise Control – HFV6 Page 8C–9
2 Diagnostics
2.1 Diagnostic General Information
Basic Knowledge Required

A lack of basic understanding regarding
electronics, electrical wiring circuits and use
of electrical circuit testing tools when
performing the cruise control diagnostic
procedures could result in incorrect
diagnostic results or damage to components.
A general understanding of basic electronics, electrical wiring circuits and the correct use of the basic electrical circuit
testing tools is required to perform the diagnostic procedures detailed in this Section. Refer to 8A Electrical – Body and
Chassis W iring Diagrams for information on electrical circuits.
In addition, a general understanding of the cruise control and its component operation is essential to prevent
misdiagnosis and component damage.
Basic Diagnostic Tools Required

Use of incorrect electrical circuit diagnostic
tools when performing the cruise control
diagnostic procedures could result in
incorrect diagnostic results or damage to
components.
The following electrical circuit testing tools are required to perform the diagnostic procedures detailed in this Section:
• test lamp,
• digital multimeter with 10 meg ohms impedance, and
• connector test adapter kit Tool No. KM609.
For further information on the use of these tools, refer to 8A Electrical – Body and Chassis W iring Diagrams.

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

Cruise Control – HFV6 Page 8C–14
2.4 Cruise Control Inoperative /
Malfunctioning
Circuit Description
When the ON-OFF button is pressed, 12 V is applied to the Powertrain Interface Module (PIM) connector B – 97 pin 14.
This enables and disables cruise control operation.
Pressing the cruise control switch assembly to SET–COAST button activates the cruise control at a desired speed above
40 km/h. This provides a 12 V signal to the PIM through connector B – 97 pin 15.
Pressing and holding the cruise control switch to SET–COAST provides a 12 V signal to the PIM at connector B – 97
pin 15. Turning the cruise control switch to RES–ACC will apply a 12 V signal to the PIM at connector B – 97 pin 16.
Turning the cruise control switch to CANCEL will apply a 12 V signal to the PIM at connector B – 97 pin 17.
Pressing the brake pedal opens the cruise Initial Brake Apply Signal circuit thus removing 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. Both these signals must be present so as to ensure the safe operation of the vehicle’s
cruise cancel function.
Manual Vehicles Only
Pressing the clutch pedal opens the cruise cancel circuit thus removing the supply voltage from the ECM at connector C
– 56 pin 53.
For detailed information refer to 3.4 Clutch Pedal Switch (Manual Only) in this Section.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
4–7 Checks the cruise control switch and associated circuits are functioning correctly.
8–9 Checks the brake pedal switch assembly and associated circuit are functioning correctly.
10 Checks the clutch pedal switch assembly and associated circuits are functioning correctly.
11–21 Covers the testing and replacement of system components.
22–28 Checks for intermittent faults in associated circuits and connectors.
Diagnostic Table Notes
1 For all wiring harness fault diagnoses and repairs, refer to 2.3 W iring Diagrams in this Section.
2 Tech 2 can display a stored history of which system parameter or input caused the cruise control to disengage. This can aid diagnosis of intermittent faults.

Diagnostic Table
Step Action Yes No
1 Did you review the System Operation?
Go to Step 2 Go to 1.3
System Operation
2 Did you read Diagnostic Systems Check ?
Go to Step 3 Go to Diagnostic
Systems Check

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

Cruise Control – HFV6 Page 8C–15
Step Action Yes No
3 Check the ignition supply circuits to the Stop Lamp Switch assembly
connector C – 44 pin 1 is serviceable using a multimeter set to
measure voltage, refer to 2.3 W iring Diagrams in this Section
Is there a +12 volt signal present at connector C – 44 pin 1?
Go to Step 4 Replace the faulty
fusible link Main,
IG2 or Stop Light fuse (refer to Note 1).
If either of the
fusible links or fuse blows again, repair
or replace the faulty circuit (refer to
Note 1)
4 1 Connect Tech 2 to the DLC.
2 On Tech 2 select: Body / Powertrain Interface Module / Diagnostic Data
Display.
3 Scroll to Cruise Main Switch.
4 W hile monitoring Tech 2, press the cruise control switch ON– OFF button.
Does Tech 2 display the following:
• Inactive and Active as the cruise control switch is pressed?
Go to Step 5 Go to Step 11
5 1 Scroll to Cruise Resume Switch.
2 While monitoring Tech 2, rotate the cruise control switch.
Does Tech 2 display the following:
• Inactive when the cruise control switch is in the neutral
position?
• Res / Acc when the cruise control switch is rotated to the RES–
ACC. Position? Go to Step 6 Go to Step 12
6
1 Scroll to Cruise Set Switch.
2 W hile monitoring Tech 2, press the cruise control switch.
Does Tech 2 display the following:
• Inactive when the cruise control switch is in the neutral
position?
• Set / Coast when the cruise control switch is pressed to the
SET–COAST position? Go to Step 7 Go to Step 13
7 1 Scroll to Cruise Cancel Switch.
2 While monitoring Tech 2, rotate the cruise control switch.
Does Tech 2 display the following:
• Inactive when the cruise control switch is in the neutral
position?
• Cancel when the cruise control switch is rotated to the CANCEL
position? Go to Step 8 Go to Step 14

BACK TO CHAPTER INDEX
TO MODEL INDEXISUZU KB P190 2007