Isuzu KB P190. Manual — part 926

Powertrain Interface Module – V6

Page 6E1–43

9.8

DTC B3627 – Cruise Control Resume
Signal Malfunction

DTC Description

This diagnostic procedure supports DTC B3627 – Cruise Control Resume Switch Stuck.

Circuit Description

The cruise control resume switch is a normally open switch that closes when the switch is activated. When activated, the
switch supplies signal voltage to the cruise control resume signal circuit. The powertrain interface module (PIM) converts
the signal voltage input into serial data, which is used by the engine control module (ECM) to resume cruise control
operation.

Additional Information

•

Refer to 8C Cruise Control – HFV6 for the following information:

•

Cruise control switch description, operation and inspection procedures, and

•

Cruise control wiring diagram.

•

Refer to 6 Wiring Diagram and Connector for the following information:

•

PIM connector illustration and terminal assignment, and

•

PIM wiring diagram.

•

For intermittent fault conditions, refer to

Intermittent Fault Conditions.

•

Since fault conditions in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic
procedure for shorted terminals or poor wiring connection before replacing any component. Refer to 8A Electrical -
Body and Chassis for information on electrical fault diagnosis.

Conditions for Running the DTC

Conditions for running the DTC are:

•

The ignition is switched on.

•

The ignition voltage is 10.0 – 16.0 V.

Conditions for Setting the DTC

The PIM detects the cruise control resume function of the cruise control switch assembly is in the RESUME position for
120 seconds or more.

Action Taken When the DTC Sets

When the DTC sets, there is no warning lamp displayed on the instrument cluster.

If the cruise control is active at the time the DTC sets, the PIM will disable cruise control.

Conditions for Clearing the DTC

Refer to 4.1

Diagnostic General Descriptions for information on the conditions for clearing DTCs.

Powertrain Interface Module – V6

Page 6E1–44

N O T E

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.

Powertrain Interface Module – V6

Page 6E1–45

9.9

DTC B3628 – Cruise Control Set Signal
Malfunction

DTC Description

This diagnostic procedure supports DTC 3598 – Cruise Control Set Switch Stuck.

Circuit Description

The cruise control set switch is a normally open switch that closes when the switch is activated. When activated, the
switch supplies signal voltage to the cruise control set signal circuit. The powertrain interface module (PIM) converts the
signal voltage input into serial data, which is used by the engine control module (ECM) to set the vehicle speed.

Additional Information

•

Refer to 8C Cruise Control – HFV6 for the following information:

•

Cruise control switch description, operation and inspection procedures, and

•

Cruise control wiring diagram.

•

Refer to 6 Wiring Diagram and Connector for the following information:

•

PIM connector illustration and terminal assignment, and

•

PIM wiring diagram.

•

For intermittent fault conditions, refer to

Intermittent Fault Conditions.

•

Since fault conditions in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic
procedure for shorted terminals or poor wiring connection before replacing any component. Refer to 8A Electrical -
Body and Chassis for information on electrical fault diagnosis.

Conditions for Running the DTC

Conditions for running the DTC are:

•

The ignition is switched on.

•

The ignition voltage is 10.0 – 16.0 V.

Conditions for Setting the DTC

The PIM detects the cruise control set function of the cruise control switch assembly is in the SET position for 120
seconds or more.

Action Taken When the DTC Sets

When the DTC sets, there is no warning lamp displayed on the instrument cluster.

If the cruise control is active at the time the DTC sets, the PIM will disable cruise control.

Conditions for Clearing the DTC

Refer to 4.1

Diagnostic General Descriptions for information on the conditions for clearing DTCs.

N O T E

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 set switch using Tech 2.

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. When activated, the
switch supplies signal voltage to the cruise control on signal circuit. The powertrain interface module (PIM) converts the