Isuzu KB P190. Manual — part 921

Powertrain Interface Module – V6

Page 6E1–23

Pin No.

Wire Colour

Circuit

Description

Function

20 P/L

Cru Cont Sw

Pwr ON

Cruise Control Switch Power ON

21 BR/R Batt

Battery

Supply

22

B

Grd

Ground Engine Bay – L/H

23 — —

Not

Connected

24

G/Y

A/T Pwr Dr Sw

Auto Transmission Power Drive

Powertrain Interface Module – V6

Page 6E1–24

7

Diagnostics Starting Point

7.1

Diagnostic Requirements, Precautions
and Preliminary Checks

Basic Knowledge Required

A lack of basic understanding of electronics,
electrical wiring circuits and use of electrical
circuit testing tools when performing the PIM
diagnostic procedures could result in
incorrect diagnostic results or damage to
components.

In addition, understanding of the Engine Management System is essential to prevent misdiagnosis and component
damage. Refer to 6C1-1 Engine Management – V6 – General Information.

Basic Diagnostic Tools Required

Use of incorrect electrical circuit diagnostic
tools when performing the PIM 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:

•

Tech 2.

•

Test lamp, refer to 8A Electrical - Body and Chassis for further information.

•

Digital multimeter with 10 M

Ω impedance, refer to 8A Electrical - Body and Chassis for further information.

•

Connector test adapter kit Tool No. J35616-A.

Diagnostic Precautions

In addition to the safety and precautionary
measures listed in 11.1

Safety

and

Precautionary Measures, the following
diagnostic precautions must be observed
when performing any PIM diagnostic
procedure:

•

Use only the test equipment specified in the diagnostic tables. Other test equipment may either give incorrect
results or damage serviceable components.

•

Do not clear any DTCs unless instructed.

•

The fault must be present when using the DTC Diagnostic Tables. Otherwise, misdiagnosis or replacement of
serviceable parts may occur.

•

Always use connector adapters such as those contained in connector test adapter kit Tool No. J35616-A to prevent
connector terminal damage.

Powertrain Interface Module – V6

Page 6E1–25

•

Thorough inspection of the wiring circuits and connectors listed in the diagnostic procedures must be performed,
otherwise misdiagnosis may occur.

•

Inspect the electrical circuitry or connector terminals that are suspected to be causing the complaint for the
following conditions:

•

backed-out connector terminals,

•

improper wiring connector mating,

•

broken wiring connector locks,

•

damaged connector terminals, and

•

physical damage to the wiring harness.

•

Before replacing a component, inspect its connector terminal for corrosion or deformation that may cause the fault
condition.

Preliminary Checks

The PIM preliminary check examines easily accessible components which may cause problems with the PIM. This visual
and physical inspection procedure may quickly identify the fault condition and eliminate the need for additional diagnosis.

•

Refer to Service Techlines for relevant information regarding the fault condition.

•

Ensure the battery is fully charged.

•

Check the battery connections for corrosion or a loose terminal.

•

Perform a visual and physical inspection of the following:

•

PIM component wiring harness and terminals for proper connections, pinches or cuts, and

•

PIM wiring harness routing which may be positioned very close to a high voltage or high current devices such
as aftermarket audio systems.

N O T E

High voltage or high current devices may induce
electrical noise on a circuit, which can interfere
with normal circuit operation.

•

The PIM is sensitive to Electro Magnetic Interference (EMI). Check for incorrect aftermarket theft deterrent
devices, lights or mobile phone installations if an intermittent malfunction is suspected.

7.2

Diagnostic System Check

Step Action

Yes

No

1

Have you met the basic diagnostic requirements listed in the PIM
Diagnostic Starting Point?

Go to Step 2

Refer to

7.1 Diagnostic

Requirements,

Precautions and

Preliminary Checks

2

Have you read the Diagnostic Precautions?

Go to Step 3

Refer to

7.1 Diagnostic

Requirements,

Precautions and

Preliminary Checks

3

Have you performed the Preliminary Checks?

Go to Step 4

Refer to

7.1 Diagnostic

Requirements,

Precautions and

Preliminary Checks

Powertrain Interface Module – V6

Page 6E1–26

Step Action

Yes

No

4

Using Tech 2, attempt to communicate with the PIM.

Does Tech 2 communicate with the PIM?

Go to Step 5

Refer to

7.3 Powertrain

Interface Module –

Module

Communication

Check Failure

Diagnostic Table

5

Using Tech 2, view and record all DTCs.

Does Tech 2 display any DTCs?

Go to Step 6

Refer to

Intermittent

Fault Conditions.

6

Does DTC C0550 fail this ignition cycle?

Refer to

9.1 DTC

C0550 – PIM
Internal Fault

Diagnostic Table

Go to Step 7

7

Does DTC U2100 fail this ignition cycle?

Refer to

9.2 DTC

U2100 – No

Communication

With CAN Bus (High

Speed) Diagnostic

Table

Go to Step 8

8

Does DTC U2106 fail this ignition cycle?

Refer to

9.4 DTC

U2106 – CAN Bus

No Communication

With Transmission

Control Module

Go to Step 9

9

Does DTC U2105 fail this ignition cycle?

Refer to

9.3 DTC

U2105 – CAN Bus

No Communication

With Engine Control

Module Diagnostic

Table

Go to Step 10

10 Does Tech 2 display multiple DTCs?

Refer to

the DTC Table of

the fault condition

that is most likely to

trigger multiple
DTCs. Refer to

4.1 Diagnostic

General

Descriptions for

information on

multiple DTCs fault

condition

Refer to the relevant

DTC table

When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation.