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.