Isuzu KB P190. Manual - part 918

Powertrain Interface Module – V6 

Page 6E1–11 

 

2.2 Interior 

 

Figure 6E1 – 4 

Legend 

1 

Cruise Control Switch Assembly  

2 

Power Mode Switch – Automatic Transmission 

3 3

rd

 Start Switch – Automatic Transmission 

  

4 

 Immobiliser Control Unit (ICU) 

5 

Powertrain Interface Module (PIM) 

6 

 Transmission Control Module (TCM) 

N O T E  

Components shown in Figure 6E1 – 4 will vary 
depending on vehicle options. 

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 lower hinge pillar trim. 

Figure 6E1 – 5 

 

The PIM performs the following functions: 

• 

The PIM acts as the communication gateway between the GM LAN communications protocol and keyword 2000 
protocol.  

• 

The PIM converts analogue signals from the cruise control switches into digital serial data. 

• 

The PIM upon inputs received from the engine control module (ECM), transmission control module (TCM) and 
immobiliser control unit (ICU) controls the operation of the following instruments and warning lamps: 

• 

Speedometer 

• 

Tachometer 

• 

Check Transmission Lamp 

• 

3

rd

 Gear Start Lamp 

• 

Power Mode Switch Lamp 

 

• 

Automatic Transmission Oil Temp Lamp 

• 

Cruise Set Lamp 

• 

Oil Pressure Lamp 

• 

Service Vehicle Soon (SVS) Lamp 

• 

Charge Warning Lamp 

• 

PRNDL Lamps 

• 

The PIM is responsible for authenticating the immobiliser control unit (ICU) prior to the engine control module 
(ECM) authenticating the PIM. If any of these authentication processes fail, the vehicle will not start. For further 
information on the immobiliser system, refer to 11A Immobiliser System. 

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 ECM communicates directly with the transmission 
control module (TCM) and PIM via the serial data network. 

The ECM is also an integral part of the vehicle security 
system. For further information on vehicle security, refer to 
11A Immobiliser System. 

Figure 6E1 – 6 

Immobiliser Control Unit 

The immobiliser control unit (ICU) is mounted to the left of 
the steering column. 

The ICU in conjunction with the, powertrain interface module 
(PIM) and engine control module (ECM) immobilises the 
engine. The ICU communicates with the ECM via the PIM. 
Refer to 11A Immobiliser for further information on the 
immobiliser system. 

Figure 6E1 – 7 

Automatic Transmission Control Module  

The transmission control module (TCM) is located under the 
right-hand rear drivers seat, beneath the carpet. 

The TCM's primary role is to efficiently control transmission 
shift points according to current driving and vehicle 
operating conditions. To effectively do this, the TCM 
requires information from other vehicle systems such as the 
engine management and automatic transmission systems. 

This information exchanged is achieved by connecting the 
various system control modules via the serial data network. 
For further information on the serial data network, refer to  
1 General 

Information. 

Figure 6E1 – 8 

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. 
When 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 3

rd

 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. When 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 3

rd

 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 3

rd

 start switch inputs directly into the PIM. When 

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