2007 ISUZU KB P190 service

Cruise Control – HFV6 Page 8C–3
1 General Information
A new cruise control system has been introduced due to changes in the powertrain architecture and components. There
is no longer a cruise control module; instead the management has been taken over by the engine control module (ECM).
To the user, the system operates as previously, with all controls from the cruise control switch assembly and the cruise
control messages presented by the instrument cluster. For vehicles fitted with the HFV6 engine refer to 1.3 System
Operation .

The cruise control system now has an
additional fail-safe feature. The brake pedal
must be pressed in the ignition cycle for the
cruise control to be engaged. The cruise
control will not engage until this is done.
1.1 WARNINGS, CAUTIONS and NOTES
This Section contains various W ARNINGS, CAUTIONS and NOTE statements that you must observe carefully to reduce
the risk of death or injury during service, repair procedures or vehicle operation. Incorrect service or repair procedures
may damage the vehicle or cause operational faults. W ARNINGS, CAUTION and NOTE statements are not exhaustive.
GM HOLDEN LTD can not possibly warn of all the potentially hazardous consequences of failure to follow these
instructions.
Definition of WARNING, CAUTION and NOTE Statements
Diagnosis and repair procedures in this Section contain both general and specific W ARNING, CAUTION and NOTE
statements. GM HOLDEN LTD is dedicated to the presentation of service information that helps the technician to
diagnose and repair the systems necessary for proper operation of the vehicle. Certain procedures may present a hazard
to the technician if they are not followed in the recommended manner. W ARNING, CAUTION and NOTE statements are
designed to help prevent these hazards from occurring, but not all hazards can be foreseen.
WARNING Defined
A W ARNING statement immediately precedes an operating procedure or maintenance practice which, if not correctly
followed, could result in death or injury. A WARNING statement alerts you to take necessary action or not to take a
prohibited action. If a W ARNING statement is ignored, the following consequences may occur:
• Death or injury to the technician or other personnel working on the vehicle,
• Death or injury to other people in or near the workplace area, and / or
• Death or injury to the driver / or passenger(s) of the vehicle or other people, if the vehicle has been improperly
repaired.
CAUTION Defined
A CAUTION statement immediately precedes an operating procedure or maintenance practice which, if not correctly
followed, could result in damage to or destruction of equipment, or corruption of data. If a CAUTION statement is ignored,
the following consequences may occur:
• Damage to the vehicle,
• Unnecessary vehicle repairs or component replacement,
• Faulty operation or performance of any system or component being repaired,
• Damage to any system or components which depend on the proper operation of the system or component being
repaired,
• Faulty operation or performance of any systems or components which depend on the proper operation or
performance of the system or component under repair,
• Damage to fasteners, basic tools or special tools and / or
• Leakage of coolant, lubricant or other vital fluids.

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Cruise Control – HFV6 Page 8C–10
Tech 2 Data List
The Tech 2 displays the status of certain cruise control system input parameters.
To view the data list:
1 Connect Tech 2 to the data link connector (DLC) and turn on the ignition.
2 On Tech 2 select Body / Powertrain Interface Module / Diagnostic Data Display / Data List .
Tech 2 Parameter Units Displayed Typical Display Values
Cruise Cancel Switch Inactive / Active Inactive
Cruise Resume Switch Off / Enabled Off
Cruise Set Switch Inactive / Active Inactive
Cruise Main Switch Inactive / Active Inactive
Cruise Control Set Lamp Off / On Off
Cruise Control On Lamp Off / On Off
3 On Tech 2 select Engine / V6 Engine / Data Display / Data List / Cruise Control Data.
Tech 2 Parameter Units Displayed Typical Display Values
Brake Lamp Switch Inactive / Active Inactive
Initial Brake Apply Sig Inactive / Active Inactive
Cruise Set / Decel Swit Inactive / Active Inactive
Cruise Resume / Accelerat Inactive / Active Inactive
Cruise Control Disengag Engine Speed / Brake Engine Speed
4 On Tech 2 select Engine / V6 Engine / Data Display / Data List / Engine Data 1.
Tech 2 Parameter Units Displayed Typical Display Values
Clutch Pedal Switch Inactive / Active Inactive

2.2 Diagnostic Systems Check
Diagnostic Systems Check
Refer to 2.3 Wiring Diagram to aid in the diagnosis of the cruise control system.
For the cruise control system to work effectively the following systems / components need to be serviceable:
Step Action Yes No
1 Is the fault specifically isolated to this system / module?
Go to Step 2 Go to 6E1
Powertrain Interface Module – V6
2 1 Connect Tech 2 to the DLC.
2 Ignition ON, engine OFF.
3 On Tech 2 select Body / Powertrain Interface Module / Diagnostic Trouble
codes / Read DTCs’.
Are there any set DTC’s? Go to the
appropriate DTC table in 6E1
Powertrain Interface Module – V6. Go to Step 3

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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

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Cruise Control – HFV6 Page 8C–16
Step Action Yes No
8 1 Return to the Main Menu on Tech 2.
2 On Tech 2 select: Engine / V6 Engine / Data Display / Cruise Control Data.
3 Scroll to Brake Lamp Switch.
4 While monitoring Tech 2, press and then release to the brake pedal.
Does Tech 2 display the following:
• Active as the brake pedal is pressed?
• Inactive when the pedal is released? Go to Step 9 Go to Step 15
9 1 Scroll to Initial Brake Apply Sig.
2 While monitoring Tech 2, press and then release to the brake pedal.
Does Tech 2 display the following:
• Inactive when the pedal is released?
• Active as the brake pedal is pressed? Go to Step 10 Go to Step 16
10
NOTE
This procedure is only required on vehicles fitted with
manual transmissions. If the vehicle is fitted with an
automatic transmission, go to Step 24.
1 Scroll to Cruise Control Active .
2 While monitoring Tech 2, press and then release to the clutch pedal.
Does Tech 2 display the following:
• Active when the pedal is released?
• Inactive as the clutch pedal is pressed?
Go to Step 30 Go to Step 17
11 Test the cruise control main switch, refer to 3.1 Cruise Control
Main Switch
Is the cruise control switch serviceable? Go to Step 22 Go to Step 18
12 Test the cruise control switch assembly, refer to 3.2 Cruise Control
Switch Assembly
Is the cruise control switch assembly serviceable? Go to Step 23 Go to Step 18
13 Test the cruise control switch assembly, refer to 3.2 Cruise Control
Switch Assembly
Is the cruise control switch assembly serviceable? Go to Step 24 Go to Step 18
14 Test the cruise control switch assembly, refer to 3.2 Cruise Control
Switch Assembly
Is the cruise control switch assembly serviceable? Go to Step 25 Go to Step 18
15 Test the stop lamp switch assembly, refer to 3.3 Stop Lamp
Switch Assembly.
Is the stop lamp switch serviceable? Go to Step 26 Go to Step 19
16 Test the stop lamp switch assembly, refer to 3.3 Stop Lamp
Switch Assembly.
Is the stop lamp switch serviceable? Go to Step 26 Go to Step 20

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Cruise Control – HFV6 Page 8C–17
Step Action Yes No
17
NOTE
This procedure is only required on vehicles fitted with
manual transmissions. If the vehicle is fitted with an
automatic transmission go to Step 26.
Test the clutch pedal switch, refer to
3.4 Clutch Pedal Switch.
Is the clutch pedal switch serviceable? Go to Step 28 Go to Step 21
18 Replace the faulty cruise control switch assembly with a serviceable
item. To replace the switch assembly, refer to 8 B Cruise Control
System. Go to Step 32 —
19 Replace the faulty stop lamp switch, refer to 3.3 Stop Lamp
Switch Assembly Go to Step 32 —
20 Replace the faulty stop lamp switch, refer to 3.3 Stop Lamp
Switch Assembly Go to Step 32 —
21
Replace the faulty clutch pedal switch, refer to
3.4 Clutch Pedal Switch Go to Step 32 —
22 1 Disconnect the PIM connector B – 97.
2 Using a multimeter set to measure voltage, back probe between the harness connector B – 97 pin 14 and a known ground.
3 W ith the aid of an assistant, monitor the voltage on the multimeter and press and release the cruise control switch ON–
OFF button.
• W ith the button in the rest position, the multimeter should
display 0 V.
• W ith the button pressed, the multimeter should display
battery voltage.
Does the multimeter display as described? Go to Step 30 Check for short to
ground or open circuit.
Repair as required
(refer to Note 1).
Go to Step 32
23 1 Disconnect the PIM connector B – 97.
2 Using a multimeter set to measure voltage, back probe between the harness connector B – 97 pin 16 and a known ground.
3 With the aid of an assistant, monitor the voltage on the multimeter and rotate and release the cruise control switch to
RES–ACC position.
• With the switch in the rest position, the multimeter should
display 0 V.
• With the switch rotated, the multimeter should display
battery voltage.
Does the multimeter display as described? Go to Step 30 Check for short to
ground or open
circuit on circuit.
Repair as required
(refer to Note 1).
Go to Step 32

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Cruise Control – HFV6 Page 8C–19
Step Action Yes No
28 1 Disconnect the ECM connector C – 56.
2 Using a multimeter set to measure voltage, back probe between the harness connector C – 56 pin 53 and ground.
3 W ith the aid of an assistant, monitor the voltage on the multimeter and press and release the clutch pedal.
• With the clutch pedal in the rest position, the multimeter
should display battery voltage
• W ith the clutch pedal pressed, the multimeter should
display 0 V
Does the multimeter display as described? Go to Step 31 Check for a blown
fuse C-4.
Check for short to ground or open circuit
Repair as required (refer to Note 2).
Go to Step 32
29 Check all associated circuits and connectors for the following:
• Loose or damaged connections
• Intermittent faults.
Refer to the Wiring Diagrams in this Section and repair as required.
W as the repair completed? Go to Step 32 —
30 Replace the PIM, refer to 6E1 Powertrain Interface Module – V6.
W as the repair completed? Go to Step 32 —
31 Replace the ECM module, refer to 6C1-3 Engine Management – V6
Service Operations.
W as the repair completed? Go to Step 32 —
32 Operate the system in order to verify the repair.
Did you correct the condition? System OK Go to Step 1
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.

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Cruise Control – HFV6 Page 8C–20
3 Service Operations
3.1 Cruise Control Main Switch
Remove
To remove the cruise control main switch, refer to 8 B Cruise Control System.
Test
Test the cruise control main switch, using a multimeter set to measure ohms check the continuity.

Figure 8C – 8
Terminal Testing
Cruise Control Main Switch
Switch Terminals Switch
Position Indication if Switch
is Serviceable
1 and 2 Switch Illumination Approx. 22 ohms
4 and 6 Cruise Lamp On Illumination Approx. 22 ohms
4 and 3 Cruise Switch Released Open circuit
4 and 3 Cruise Switch Pressed Short circuit
Reinstall
To reinstall the cruise control main switch, refer to 8 B Cruise Control System.

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Cruise Control – HFV6 Page 8C–21
3.2 Cruise Control Switch Assembly
Remove
To remove the cruise control switch assembly, refer to 8 B Cruise Control System.
Test
To test the cruise control switch assembly, use a multimeter to check the continuity.

1 Remove the lower dash trim panel and locate the cruise control switch assembly wiring harness that
connects a white 13 pin male plug to a connector sub
panel located on the right hand side below of the
steering column.
2 Disconnect the 13 pin male plug B – 59 from its mating connector socket.
3 Place the turn signal and cruise control switch assembly into the positions detailed in the following
table, refer to Terminal Testing. Position the contacts
of the multimeter onto the terminals and take the
reading. Compare the multimeter readings with the
values in the table.
4 If the switch assembly fails any part of the test, replace the cruise control switch assembly with a serviceable
item. To replace the switch assembly, refer to 8 B
Cruise Control System.

Figure 8C – 9
Terminal Testing
Cruise Control Switch Assembly
Switch Terminals Switch
Position Indication if Switch
is Serviceable
11 and 10 CANCEL Applied Open Circuit
11 and 10 CANCEL Released Short Circuit
11 and 12 SET–COAST Pressed Short Circuit
11 and 12 SET–COAST Released Open Circuit
11 and 9 RES–ACC Applied Short Circuit
11 and 9 RES–ACC Released Open Circuit
Reinstall
To reinstall the cruise control switch assembly, refer to 8 B Cruise Control System.

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