Isuzu KB P190. Manual - part 1465

IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)   11A-9

3

Observe the Ignition Status parameter on the
immobilizer data display function.

Does the scan tool indicate ON and OFF with each
ignition switch transition?

—

Go to Step 5

Go to Step 4

4

Repair the open circuit or high resistance between
the Meter (10A) fuse and the ICU (pin 9 of B-109).
Check Meter (10A) fuse first.

Did you complete the repair?

—

Go to Step 5

—

5

Select the DTC display function for the following
control modules:

• ICU

• ECM

• PIM

• TCM (AISIN A/T or 4L-60E)

Does the scan tool display any DTCs?

—

Go to Step 6

Go to Step 12

6

Does the scan tool display DTCs which begin with
a U or other control module communication fault
DTCs?

—

Go to Applicable 

DTC

Go to Step 7

7

Does the scan tool displays ICU DTC B0001?

—

Go to Applicable 

DTC

Go to Step 8

8

Does the scan tool displays ICU DTCs B0002 or
B0012?

—

Go to Applicable 

DTC

Go to Step 9

9

Is there any other code in any controller that has
not been diagnosed?

—

Go to Applicable 

DTC

Go to Step 10

10

Is the customer's concern with the engine?

—

Go to Diagnostic 
System Check  - 

Engine Controls

Go to Step 11

11

Is the customer's concern with the transmission?

—

Go to Diagnostic 

System Check - 

Transmission 

Controls

Go to Step 12

12

Attempt to crank the engine.

Does the engine crank?

—

Go to Step 13

Problem is relating 

to starting system. 

Refer to the 

applicable 

diagnostic chart in 

starting system 

section

13

Attempt to start the engine.

Does the engine start and idle?

—

System OK

Go to Engine 

Cranks but Does 

Not Run in engine 

control section

Step

Action

Value(s)

Yes

No

11A-10   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

Scan Tool Data List

The Immobilizer Scan Tool Data List contains all
immobilizer related parameters that are available on
the scan tool. Use the Immobilizer Scan Tool Data List
only after the following is determined:

• The Immobilizer Controls - Diagnostic System

Check is completed.

• On-board diagnostics are functioning properly.

A scan tool that displays faulty data should not be used.
Use of a faulty scan tool can result in misdiagnosis and
unnecessary parts replacement. 

Only the parameters listed below are referenced in this
service manual for use in diagnosis.

Scan Tool Data Definitions

This information will assist in immobilizer problems.
Always perform the Diagnostic System Check -
Immobilizer Controls first. The Diagnostic System
Check will confirm proper system operation.

Ignition Status
This parameter displays the state of the ignition switch
input to the ICU. On indicates the ignition switch is
turned ON position.

Transponder Key
This parameter displays the state of the transponder
key in the steering lock. Transponder Key 1 to 5
indicates a correctly programmed transponder key is
used. The number 1 to 5 indicates which transponder
key is used. Invalid indicates an incorrect key is in
used. Not Programmed Key indicates a non-
programmed new transponder key is used. No
Transponder Key indicates ICU does not recognize a
transponder key.

Transponder Status
This parameter displays the state of the transponder
key in the steering lock. Correct Transponder-Key
indicates a correctly programmed transponder key is
used. Wrong Transponder-Key indicates an incorrect
key is in used. New Transponder-Key indicates a non-
programmed new transponder key is used. No
Transponder Detected indicates ICU does not
recognize a transponder key.

Transponder-Key 1 to 5 Status 
This parameter displays the state of number of
programmed transponder key(s). Programmed
indicates transponder key 1 to 5 is correctly
programmed. The number 1 to 5 indicates programmed
order.

Security Code Programmed
This parameter displays the state of the security code
programming. Yes indicates a security code is correctly
programmed. No indicates a security code is not
programmed.

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition switch ON/ Two transponder keys programmed

Ignition Status

On/ Off

On

Transponder Key

Transponder Key 1 to 5/ Invalid/ Not 

Programmed Key/ No Transponder Key

Transponder Key 1 or 2

Transponder Status

Correct Transponder-Key/ Wrong 

Transponder-Key/ New Transponder-

Key/ No Transponder Detected

Correct Transponder-Key

Transponder-Key 1 Status

Programmed/ Not Programmed

Programmed

Transponder-Key 2 Status

Programmed/ Not Programmed

Programmed

Transponder-Key 3 Status

Programmed/ Not Programmed

Not Programmed

Transponder-Key 4 Status

Programmed/ Not Programmed

Not Programmed

Transponder-Key 5 Status

Programmed/ Not Programmed

Not Programmed

Security Code Programmed

Yes/ No

Yes

Security Wait Time

Inactive/ Time (hour: minute: second)

Inactive

While Security Lock

Inactive/ Active

Inactive

IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)   11A-11

Security Wait Time 
This parameter displays the security wait time length in
the ICU. Inactive indicates not in security wait time.
Time indicates under security wait time.  This wait time
stage will prevent any further attempts to enter the
security code until the wait time has elapsed. The wait
time will increase each time an incorrect security code
is entered. Note that this parameter is not count
downed. It keeps displaying the same time until that
wait time has elapsed. The ignition switch must be kept
at ON position during the wait time period.

While Security Lock
This parameter displays the state of the security wait
time. Inactive indicates not in security wait time. Active
indicates under security wait time.

11A-12   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

Scan Tool Does Not Power Up

Circuit Description

The data link connector (DLC) is a standardized 16-
cavity connector. Connector design and location is
dictated by an industry wide standard, and is required
to provide the following:

• Scan tool power battery positive voltage at

terminal 16.

• Scan tool power ground at terminal 4.

• Common signal ground at terminal 5.

The scan tool will power up with the ignition OFF. Some
modules however, will not communicate unless the
ignition is ON.

Schematic Reference: Immobilizer Controls
Schematics

Connector End View Reference: ICU Connector End
View

Circuit/ System Testing Scan Tool Does Not Power Up

Step

Action

Value(s)

Yes

No

1

Important: Make sure the scan tool works properly
on another vehicle before using this chart.

1.

Turn OFF the ignition.

2.

Inspect the Meter (+B) (10A) fuse in the cabin
fuse block.

Is the Meter (+B) (10A) fuse open?

—

Go to Step 2

Go to Step 3

2

Replace the Meter (+B) (10A) fuse. If the fuse
continues to open, repair the short to ground on
one of the circuits that is fed by the Meter (+B)
(10A) fuse or replace the shorted attached
component.

Did you complete the repair?

—

Go to Step 7

—

3

1.

Check each circuit at the data link connector
(DLC) (B-58) for a backed out, spread or
missing terminal.

2.

Repair the terminal as necessary.

Did you find and complete the repair?

—

Go to Step 7

Go to Step 4

4

Connect a test lamp between the +B circuit (pin 16
of B-58) at the DLC and a known good ground.

Does the test lamp illuminate?

—

Go to Step 6

Go to Step 5

5

Repair the open in the battery voltage circuit to the
DLC.

Did you complete the repair?

—

Go to Step 7

—

6

1.

Test each ground circuit at the DLC (pins 4
and 5 of B-58) for an open circuit or high
resistance.

2.

Repair the circuit(s), clean or tighten ground
as necessary.

Did you find and correct the condition?

—

Go to Step 7

Go to Intermittent 

Conditions

7

1.

Connect the scan tool to the DLC.

2.

Attempt to turn ON the scan tool.

Does the scan tool ON?

—

System OK

Go to Step 1