2007 ISUZU KB P190 air condition

Powertrain Interface Module – V6 Page 6E1–42

Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 This step tests the cruise control cancel switch using Tech 2.
6 This step tests the cruise control cancel switch signal circuit.
DTC B3628 Diagnostic Table
Step Action Yes No
1
Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
7.2 Diagnostic
System Check
2 Using Tech 2, view the cruise control cancel switch status parameter
in the PIM data list.
Does Tech 2 display Active?
Go to Step 4 Go to Step 3
3
1 Switch off the ignition for 10 seconds.
2 Operate the vehicle within the conditions for setting DTC B3628.
3 Using Tech 2, select the DTC display function.
Does DTC B3628 fail this ignition cycle? Go to Step 4 Refer to
Additional
Information in this
Section
4 1 Disconnect connector B-59 from the cruise control switch
assembly.
2 Using Tech 2, view the cruise control cancel switch status parameter in the PIM data list.
Does Tech 2 display Active?
Go to Step 6 Go to Step 5
5
Replace the cruise control switch assembly, refer to 8C Cruise Control
– HFV6.
Has the repair been completed? Go to Step 8 —
6 Test the cruise control cancel switch signal circuit for a short to
voltage. Refer to 8A Electrical - Body and Chassis for information on
electrical fault diagnosis.
Has any fault been found and rectified? Go to Step 8 Go to Step 7
7 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
Has the repair been completed? Go to Step 8 —
8 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does DTC B3628 fail this ignition cycle? Go to Step 2 Go to Step 9
9
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–44

NOTE
If the fault is not evident for greater than 120
seconds, the DTC will become a history DTC and
cruise control can be resumed.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 This step tests the cruise control resume switch using Tech 2.
6 This step tests the cruise control resume switch signal circuit.
DTC B3627 Diagnostic Table
Step Action Yes No
1
Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
7.2 Diagnostic System Check
2 Using Tech 2, view the cruise control resume switch status parameter
in the PIM data list.
Does Tech 2 display Res / Accel?
Go to Step 4 Go to Step 3
3
1 Switch off the ignition for 10 seconds.
2 Operate the vehicle within the conditions for setting DTC B3627.
3 Using Tech 2, select the DTC display function.
Does DTC B3627 fail this ignition cycle? Go to Step 4 Refer to
Additional
Information in this Section
4 1 Disconnect connector B-59 from the cruise control switch
assembly.
2 Using Tech 2, view the cruise control resume switch status parameter in the PIM data list.
Does Tech 2 display Res / Accel?
Go to Step 6 Go to Step 5
5 Replace the cruise control switch assembly, refer to 8C Cruise Control
– HFV6.
Has the repair been completed? Go to Step 8 —
6 Test the cruise control resume switch signal circuit for a short to
voltage. 8A Electrical - Body and Chassis for information on electrical
fault diagnosis.
Has any fault been found and rectified? Go to Step 8 Go to Step 7
7 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
Has the repair been completed? Go to Step 8 —
8 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does DTC B3627 fail this ignition cycle? Go to Step 2 Go to Step 9
9 Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC
Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–46

6 This step tests the cruise control set switch signal circuit.
DTC 3598 Diagnostic Table
Step Action Yes No
1
Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
7.2 Diagnostic
System Check
2 Using Tech 2, view the cruise control set switch status parameter in
the PIM data list.
Does Tech 2 display Active?
Go to Step 4 Go to Step 3
3
1 Switch off the ignition for 10 seconds.
2 Operate the vehicle within the conditions for setting DTC 3598.
3 Using Tech 2, select the DTC display function.
Does DTC 3598 fail this ignition cycle? Go to Step 4 Refer to
Additional
Information in this Section
4 1 Disconnect connector B-59 from the cruise control switch
assembly.
2 Using Tech 2, view the cruise control set switch status parameter in the PIM data list.
Does Tech 2 display Active?
Go to Step 6 Go to Step 5
5 Replace the cruise control switch assembly, refer to 8C Cruise Control
– HFV6.
Has the repair been completed? Go to Step 8 —
6 Test the cruise control set switch signal circuit for a short to voltage.
Refer to 8A Electrical - Body and Chassis for information on electrical
fault diagnosis.
Has any fault been found and rectified? Go to Step 8 Go to Step 7
7 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
Has the repair been completed? Go to Step 8 —
8 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does DTC 3598 fail this ignition cycle? Go to Step 2 Go to Step 9
9
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.
9.10 DTC B3794 – Cruise Control On/Off
Signal Malfunction
DTC Description
This diagnostic procedure supports DTC B3794 – Cruise Control On/Off Switch Stuck.
Circuit Description
The cruise control on / off switch is a normally open switch that closes when the switch is activated. W hen activated, the
switch supplies signal voltage to the cruise control on signal circuit. The powertrain interface module (PIM) converts the

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–48

DTC B3794 Diagnostic Table
Step Action Yes No
1
Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
7.2 Diagnostic System Check
2 Using Tech 2, view the cruise control on / off switch status parameter
in the PIM data list.
Does Tech 2 display Active?
Go to Step 4 Go to Step 3
3
1 Switch off the ignition for 10 seconds.
2 Operate the vehicle within the conditions for setting DTC B3794.
3 Using Tech 2, select the DTC display function.
Does DTC B3794 fail this ignition cycle? Go to Step 4 Refer to
Additional
Information in this Section
4 1 Disconnect connector B-67 from the cruise control on/off switch.
2 Using Tech 2, view the cruise control on / off switch status parameter in the PIM data list.
Does Tech 2 display Active?
Go to Step 6 Go to Step 5
5 Replace the cruise control on/off switch, refer to 8C Cruise Control –
HFV6.
Has the repair been completed? Go to Step 8 —
6 Test the cruise control on / off switch signal circuit for a short to
voltage. Refer to 8A Electrical - Body and Chassis for information on
electrical fault diagnosis.
Has any fault been found and rectified? Go to Step 8 Go to Step 7
7 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
Has the repair been completed? Go to Step 8 —
8 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does DTC B3794 fail this ignition cycle? Go to Step 2 Go to Step 9
9 Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–50

• To assist diagnosis, refer to 6 W iring Diagram and Connector Chart for the system wiring diagram and
connector charts in this section.
DTC B3902 Diagnostic Table
Step Action Yes No
1
Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
7.2 Diagnostic System Check
2 Using Tech 2, perform the ICU ID check procedure.
Is the ID number displayed by Tech 2? Go to Step 3
Go to Step 5
3 1 Switch off the ignition for 30 seconds.
2 Operate the vehicle within the conditions for setting the DTC.
3 Using Tech 2, select the DTC display function.
Does DTC B3902 fail this ignition cycle? Go to Step 4 Refer to
Additional
Information in this Section
4 Test the Immobiliser system. Refer to 11A Immobiliser.
Has any fault been found and rectified? Go to Step 8 Go to Step 7
5 1 Test all ground circuits of the ICU for a high resistance or an
open circuit fault condition. Refer to 8A Electrical - Body and
Chassis for information on electrical fault diagnosis.
2 Test the ICU ignition supply voltage circuit for a high resistance, open circuit or short to ground fault condition. Refer to 8A
Electrical - Body and Chassis for information on electrical fault
diagnosis.
Has any fault been found and rectified? Go to Step 8 Go to Step 6
6 Replace the ICU. Refer to 11A Immobiliser.
W as the repair completed? Go to Step 8 —
7 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
W as the repair completed? Go to Step 8 —
8 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Do any of the immobiliser DTCs fail this ignition cycle? Go to Step 2 Go to Step 9
9
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.
9.12 DTC P0318 – Vertical Acceleration
Sensor
DTC Description
This diagnostic procedure supports the Vertical Acceleration Sensor (VAS).
Circuit Description
The vertical acceleration sensor monitors vertical movement of the vehicle. The powertrain interface module (PIM)
converts the signal voltage input into serial data, which is used by.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–52

Step Action Yes No
4
Using a digital multimeter, measure the resistance between the VAS
earth circuit and a good ground. Refer to 6 W iring Diagram and
Connector Chart.
Does the multimeter display approximately 5.0 Ω?
Go to Step 5 Go to Step 8
5
1 Remove the VAS from its mounting bracket on the vehicle
chassis.
2 Switch on the ignition with the engine not running.
3 W hile rapidly moving the sensor in a vertical up and down motion, Use a digital multimeter to measure the voltage between
the VAS output signal circuit and a good ground.
Does the multimeter display 1.8 – 3.3 V? Go to Step 6 Go to Step 9
6 Perform the following VAS inspection:
• Inspect the sensor wiring harness for conditions that may induce
electromagnetic interference. Refer to Intermittent Fault
Conditions in this Section.
• Inspect the sensor for incorrect sensor installation or incorrect
attaching nut torque value. Refer to 11.3 Vertical
Acceleration Sensor.
W as any fault found and rectified? Go to Step 11 Go to Step 7
7
Test the VAS signal circuit and 5V reference circuit for a high
resistance, open circuit, short to ground, short to voltage or shorted
together fault condition. Refer to 8A Electrical - Body and Chassis for
information on electrical fault diagnosis.
W as any fault found and rectified? Go to Step 11 Go to Step 9
8
Repair the open or high resistance fault condition in the VAS ground
circuit. Refer to 8A Electrical - Body and Chassis for information on
electrical repair procedures.
W as the repair completed? Go to Step 11 —
9 Replace the VAS. Refer to 11.3 Vertical Acceleration Sensor.
W as the repair completed? Go to Step 11 —
10 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
W as the repair completed? Go to Step 11 —
11 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does the VAS circuit DTC fail this ignition cycle? Go to Step 2 Go to Step 13
12
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC
Table in this Section System OK
When all diagnosis and repairs are completed, check the system for correct operation.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–55

Step Action Yes No
7
Test the VSS signal circuit and low reference circuit for a high
resistance, open circuit, short to ground, short to voltage or shorted
together fault condition. Refer to 8A Electrical - Body and Chassis for
information on electrical fault diagnosis.
W as any fault found and rectified? Go to Step 11 Go to Step 10
8
Repair the open or high resistance fault condition in the VSS ground
shield circuit. Refer to 8A Electrical - Body and Chassis for information
on electrical repair procedures.
W as the repair completed? Go to Step 11 —
9 Replace the VSS. Refer to 7B1_Manual Transmission.
W as the repair completed? Go to Step 11 —
10 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
W as the repair completed? Go to Step 11 —
11 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Does any of the VSS circuit DTCs fail this ignition cycle? Go to Step 2 Go to Step 12
12
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC
Table in this Section System OK
When all diagnosis and repairs are completed, check the system for correct operation.
9.14 DTC P0633 – Immobiliser Function Not
Programmed
DTC Descriptors
This diagnostic procedure supports DTC P0633 – Immobiliser Function Not Programmed.
Circuit Description
The engine control module (ECM), the powertrain interface module (PIM) and the immobiliser control unit (ICU) are
integral parts of the vehicle immobiliser system. The immobiliser system authenticates the security code programmed
into each of these modules to prevent unauthorised vehicle operation. This authentication process includes the following
steps:
1 At predetermined situations, the ICU sends a security code to the PIM.
2 W hen the ignition is switched ON, the PIM receives and compares this security code from the ICU against the security code programmed into the PIM.
3 Once the PIM receives the correct security code from the ICU, it sends a security code to the ECM.
4 The ECM receives and compares this security code from the PIM against the security code programmed into the ECM.
5 The authentication process is complete once the ECM receives the correct security code from the PIM within the specified time frame.
6 The ECM allows normal vehicle operation.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–57

Step Action Yes No
5
1 Test all ground circuits of the PIM for a high resistance or an
open circuit fault condition. Refer to 8A Electrical - Body and
Chassis for information on electrical fault diagnosis.
2 Test the PIM ignition supply voltage circuit for a high resistance, open circuit or short to ground fault condition. Refer to 8A
Electrical - Body and Chassis for information on electrical fault
diagnosis.
Has any fault been found and rectified? Go to Step 7 Go to Step 6
6 Replace the PIM. Refer to 11.2 Powertrain Interface Module.
Has the repair been completed? Go to Step 7 —
7 1 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Do any of the immobiliser DTCs fail this ignition cycle? Go to Step 2 Go to Step 8
8
Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? Go to the
appropriate DTC Table System OK
When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.
9.15 DTC P1611 – Wrong Security Code
Entered
DTC Description
This diagnostic procedure supports DTC P1611 – W rong Security Code Entered.
Circuit Description
Tech 2 is used to program the powertrain interface module (PIM). Before any programming, a security code must be
entered into Tech 2. The PIM will check if the code entered is correct before continuing. If the security code is incorrect,
DTC P1611 sets.
After an incorrect security code is entered, the PIM prevents any further attempts to enter a code until a predetermined
wait time elapses. There are several wait time stages, and for each stage, an incorrect security code may be entered
three times before the lockout time is escalated to the next stage. The lockout stages are as follows:
• Stage 1 wait time is 10 seconds.
• Stage 2 wait time is 10 seconds.
• Stage 3 wait time is 10 minutes.
• Stage 4 wait time is 20 minutes.
• Stage 5 wait time is 40 minutes.
• Stage 6 wait time is 80 minutes.
Additional Information
• Refer to 12.4 Immobiliser Link to ECM / PIM for PIM Security Code.
• Refer to 6 W iring Diagram and Connector for the following information:
• PIM connector illustration and terminal assignment, and
• PIM wiring diagram.

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ISUZU KB P190 2007