2007 ISUZU KB P190 Workshop Repair Manual

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–12

3 Component Description and
Operation
3.1 Powertrain Interface Module
The powertrain interface module (PIM) is located behind the
right-hand

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–13

3.2 Powertrain Interface Module Gateway
Components
Engine Control Module
The ECM is located at the right front of the engine
assembly.
The E

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–14

3.3 Powertrain Interface Module Direct Input
Switches
The following switches are direct wired to the PIM. These switches use the PIM to convert t

Powertrain Interface Module – V6 Page 6E1–14

3.3 Powertrain Interface Module Direct Input
Switches
The following switches are direct wired to the PIM. These switches use the PIM to convert their input signals into serial
data, which is then used by the various vehicle control modules to perform varying functions.
Cruise Control Switch
The cruise control switch is located on the left-hand side of
the steering column.
The switch is comprised of three momentary contact
switches which control the following functions:
• cruise control push button switch (ON–OFF),
• cruise control resume – accelerate (RES–ACCEL),
and
• cruise control set – decelerate (SET–DECEL).
The three cruise control switches directly input into the PIM.
W hen any of these switches are activated, the PIM sends a
message on the serial data bus to the ECM. For further
information on the cruise control system, refer to 8C Cruise
Control – HFV6.

Figure 6E1 – 9
Power Mode Switch – Automatic Transmission
The power mode switch is located at the front of the floor
console, forwards of the 3rd start switch.
The power mode switch is an on-off rocker type switch that
changes the transmission shift points. The power mode
switch inputs directly into the PIM. W hen the switch is in the
on position, the PIM sends a message on the serial data
bus to the Transmission Control Module (TCM). For further
information on the automatic transmission, refer to:
7C1 Automatic Transmission – 4L60E – General
Information.
Figure 6E1 – 10

3
rd Start Switch – Automatic Transmission
The 3rd start switch is located at the front of the floor
console, behind the power mode switch.
The 3
rd start switch is a momentary contact switch that
enables the vehicle to be driven from the stationery position
in 3
rd. The 3rd start switch inputs directly into the PIM. W hen
the switch is pressed, the PIM sends a message on the
serial data bus to the transmission control module (TCM).
For further information on the automatic transmission, refer
to 7C1 Automatic Transmission – 4L60E – General
Information.
Figure 6E1 – 11

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–15

4 Diagnostics
4.1 Diagnostic General Descriptions
The powertrain interface module (PIM) diagnostic procedure is organised in a logical structure

Powertrain Interface Module – V6 Page 6E1–15

4 Diagnostics
4.1 Diagnostic General Descriptions
The powertrain interface module (PIM) diagnostic procedure is organised in a logical structure that begins with the
Diagnostic System Check. The Diagnostic System Check directs the diagnostic procedure to the logical steps or
appropriate diagnostic table required to diagnose a PIM fault condition.
The diagnostic tables locate a faulty circuit or component through a logical based process of elimination. Correct use of
the diagnostic tables is essential to reduce diagnostic time and to prevent misdiagnosis.
In addition, the Diagnostic System Check provides the following information:
• identification of the PIM,
• condition of the diagnostic circuit, and
• identification and status of the DTCs if present.
Diagnostic Trouble Code (DTC) Tables
The diagnostic procedure is directed to a diagnostic trouble code (DTC) table if there are DTCs currently stored in the
PIM.
The diagnostic tables are designed to locate a faulty circuit or component through a logical based process of elimination.
The diagnostic tables are developed with the following assumptions:
• the vehicle functioned correctly at the time of assembly,
• there are no multiple faults, and
• the problem currently exists.
Multiple DTCs
W hen performing a DTC check and there are multiple DTCs, the diagnostic process must begin with the most likely DTC
that may trigger other DTCs.
Knowledge of the PIM and Tech 2 limitations are important to reduce diagnostic time and to prevent misdiagnosis. Refer
to 7.1 Diagnostic Requirements, Precautions and Preliminary Checks.
Diagnostic Trouble Codes (DTCs)
W hen the ignition switch is turned on, the PIM performs an internal integrity check that detects and isolates any internal
faults. The PIM also monitors the direct input switches such as the cruise control and the serial data bus for messages
from the control modules on the GM LAN bus. If a fault is detected by the PIM, it will log a Diagnostic Trouble Code
(DTC) that represents the fault detected. The DTCs stored in the PIM may be accessed using Tech 2.
Status of DTCs
The PIM designates the DTCs logged into a Current or History DTC.
Current DTCs
If the fault condition that triggers the DTC is present during the last PIM self test, that DTC will be designated as a current
DTC.
History DTCs
If the fault condition that triggers the DTC is not present during the last PIM self test, that DTC will be designated as a
history DTC.
Conditions for Clearing DTCs
• If there is no DTC logged in the current PIM self test, the current DTC will be cleared.
• If there is no DTC logged after 100 consecutive drive cycles, the history DTC will be cleared.

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–16

Tech 2 PIM Diagnostic Tests
Tech 2 Limitations
Some DTCs trigger other DTCs to set, which causes Tech 2 to display multiple DTCs. In those situati

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–17

5 GM LAN Serial Communication
Circuit

Figure 6E1 – 12

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–18

6 Wiring Diagram and Connector
Chart
6.1 Wiring Diagrams

Figure 6E1 – 13

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ISUZU KB P190 2007 Workshop Repair Manual Powertrain Interface Module – V6 Page 6E1–19

Figure 6E1 – 14

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