Isuzu KB P190. Service manual — part 1464
IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6) 11A-5
ICU Communication (HFV6)
11A-6 IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)
Component Locator
Immobilizer Controls Component View
Immobilizer Controls unit (ICU)
Legend
1. Immobilizer controls unit (ICU)
Engine Control Module (ECM)
Legend
1. Engine control module (ECM) (4JK1/ 4JJ1)
2. Engine control module (ECM) (HFV6)
RTW7BAMF000101
1
IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6) 11A-7
Powertrain Interface Module (PIM)
Legend
1. Powertrain interface module (PIM)
Immobilizer Control Unit (ICU) Connector
End View
Connector No.
B-109
Connector Color
White
Test Adapter No.
J-35616-64A
Pin No.
Wire Color
Pin Function
1
RED/YEL
Battery voltage
2
-
Not used
3
BLK
Ground
4
-
Not used
5
BLU
CAN high
6
YEL
CAN low
7
-
Not used
8
VIO
Alarm cancel (disarm) signal
output (with anti-theft system)
9
YEL
Ignition voltage
10
-
Not used
11
-
Not used
12
-
Not used
RTW7BASH000501
1 2 3 4 5 6
7 8 9 10 11 12
11A-8 IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)
Diagnostic Information and Procedures
Diagnostic Starting Point - Immobilizer
Controls
Begin the system diagnosis with Diagnostic System
Check - Immobilizer Controls. The Diagnostic System
Check - Immobilizer Controls will provide the following
information:
• The identification of the control modules which
command the system.
• The ability of the control modules to communicate
through the serial data circuit.
• The identification of any stored diagnostic trouble
codes (DTCs) and the their statuses.
The use of the Diagnostic System Check - Immobilizer
Controls will identify the correct procedure for
diagnosing the system and where the procedure is
located.
Diagnostic System Check - Immobilizer
Controls
Description
The Diagnostic System Check - Immobilizer Controls is
an organized approach to identifying a condition that is
created by a malfunction in the electronic immobilizer
control system. The Diagnostic System Check must be
the starting point for any immobilizer system concern.
The Diagnostic System Check directs the service
technician to the next logical step in order to diagnose
the concern. Understanding and correctly using the
diagnostic table reduces diagnostic time, and prevents
the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. Lack of communication may be because of a partial
or a total malfunction of the serial data circuit.
6. The presence of DTCs which begin with U, indicate
that some other module is not communicating.
9. If there are other modules with DTCs set, refer to the
DTC list. The DTC list directs you to the appropriate
diagnostic procedure.
Important:
• DO NOT perform this diagnostic if there is not an
immobilizer system concern, unless another
procedure directs you to this diagnostic.
• Before you proceed with diagnosis, search for
applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO
NOT clear the DTCs.
• Ensure the battery has a full charge.
• Ensure the battery cables (+) (-) are clean and
tight.
• Ensure the ICU ground is clean, tight, and in the
correct location.
• Ensure the ICU harness connector is clean and
correctly connected.
• Ensure the ICU terminals are clean and correctly
mating.
• Ensure the immobilizer security information is
correctly programmed into the ICU, ECM and PIM.
• Ensure the ICU is correctly installed to the steering
lock.
• Ensure objects does not block transponder key in
the steering lock.
• Ensure another transponder key is not attached to
the key ring.
Diagnostic System Check - Immobilizer Controls
Step
Action
Value(s)
Yes
No
1
Install a scan tool.
Does the scan tool turn ON?
—
Go to Step 2
Go to Scan Tool
Does Not Power Up
2
1.
Turn ON the ignition, with the engine OFF.
2.
Attempt to establish communication with the
listed control modules.
• ICU
• Engine control module (ECM)
• Powertrain interface module (PIM)
• Transmission control module (TCM)
(AISIN A/T or 4L-60E)
Does the scan tool communicate with all the listed
control modules?
—
Go to Step 3
Go to Scan Tool
Does Not
Communicate with
CAN Device
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