Isuzu KB P190. Manual - part 1477

11A-10  IMMOBILIZER SYSTEM (C24SE, 4JA1-T)   

Pin-outs; For Electronic Control Engine (C24SE) 

 

RUW38HSF000201 

 

 

No. Pin 

Function 

A-1 

Antenna coil positive 

A-2 

 

A-3 

Antenna coil negative 

B-1 Starter 

Relay 

B-2 Ground 
B-3 

Voltage from ignition switch ON 

B-4 

Back up voltage supply 

B-5 To 

Tech-2 

B-6 

Vehicle speed sensor 

B-7 

Communication: carry on line from ECM to ICU (Check engine lamp) 

B-8 

Communication: carry on line from ICU to ECM (Communication line W) 

 

IMMOBILIZER SYSTEM (C24SE, 4JA1-T)  11A-11 

Immobilizer control unit (ICU); 

Mechanical Control Engine (4JA1-T)

Immobilizer control unit (ICU) permits engine starting,
when the security code which compares the security
code registered into the transponder (key) and the
security code registered into ICU, and is similarly
registered into ICU and engine immobilizer unit (DDS-1) 
is compared and it is judged that  it is normal. When the
code registered into the key is unusual, and when not
recognizing a security code, engine immobilizer unit 
does not permit starting of engine by the fuel cut valve
on the fuel pump. 

The engine immobilizer unit is located with fuel cut
valve on fuel pump 4JA1-T engine. 

The immobilizer control unit decides whether there is an
abnormality the security code based on the engine
immobilizer unit security code. 

When the problem found, the engine immobilizer unit 
stops fuel supply by the fuel cut valve. 

 

 

 

 

 

 

 

 

RAW4B0SF000101 

11A-12  IMMOBILIZER SYSTEM (C24SE, 4JA1-T)   

Pin-outs 

 

 
 
 

 

 

RUW48HSF000201 

 

 

No. Pin 

Function 

1 

Back up voltage supply 

2 

Voltage from ignition switch ON 

3 Lamp 
4 

 

5 

 

6 

Antenna coil positive 

7 Ground 
8 

Engine immobilizer unit 

9 To 

Tech2 

10 

 

11 



12 

 

13 

Antenna coil negative 

14 

Starter cut relay 

 

 

IMMOBILIZER SYSTEM (C24SE, 4JA1-T)  11A-13 

Immobilizer coil (Antenna) 

Immobilizer coil is install in order that ICU may check
the security code memorized by the transponder (key).

 

RUW38HSH000301

Transponder (Key) 

Transponder is installed in the inside of a key. 

Transponder has memorized the security code of a
immobilizer system. 

 

LTW3BASH000101

 
Legend 

  (1) Transponder (Key) 

 

 
 

 

Check engine lamp 

Check engine lamp displays failure or a system
operation of a immobilizer system by flash of a lamp. 

 
 

 

 

RTW76ESH004001

Engine control module (ECM) 

ECM will stop engine, if it communicates with ICU and 
abnormalities are detected by a key and the immobilizer
system. 

 

 

 
 
 
 

 

 
 

RTW7BASH000601

 

Legend 

  (1) ECM (C24SE engine)