Isuzu KB P190. Manual - part 313

6E-218  Engine Control System (4JH1) 

DTC P1611 (Symptom Code A) (Flash Code 56) 

Circuit Description 
The electronically erasable programmable read only 
memory (EEPROM) memorize immobilizer security
code and secret key for communication with the
immobilizer control unit (ICU). If the engine control
module (ECM) detects wrong security code is
programmed into the ECM, this DTC will set. 
Condition for Setting the DTC 

•  The ECM detects wrong immobilizer security code

is programmed. 

Action Taken When the DTC Sets 

•  The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails. 

•  The desired fuel injection quantity is set 0 mg/strk.

 

Condition for Clearing the MIL/DTC 

•  The ECM turns OFF the MIL when the diagnostic 

runs and does not fail. 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  Programming ECM with wrong security code may 

set this DTC. 

•  ECM with wrong specification may set this DTC. 
 

DTC P1611 (Symptom Code A) (Flash Code 56) 
 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Select the “Immobilizer” in the system selection 

menu. 

5.  Monitor the Diagnostic Trouble Code (DTC) Info 

Ordered By Priority with the scan tool. 

Does the immobilizer DTCs fail this ignition which 
begin with B? 

 

Go to Applicable 

DTC in Immobilizer 

Section 

Go to Step 3 

3 

Monitor the DTC Information with the scan tool. 
Does the DTC fail this ignition? 

 

Go to Step 4 

Go to Diagnostic 

Aids 

4 

Program or reprogram immobilizer function into the 
engine control module (ECM). Refer to Programming 
Engine Control Module (ECM) in immobilizer section.
Did you find and correct the condition? 

 

Go to Step 6 

Go to Step 5 

5 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 6 

 

6 

1.  Clear the DTCs with the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Monitor the DTC Information with the scan tool. 
Did the DTC fail this ignition? 

 

Go to Step 2 

Go to Step 7 

7 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

 

Engine Control System (4JH1)  6E-219 

DTC P1612 (Symptom Code A) (Flash Code 56) 

Circuit Description 
The engine control module (ECM) communicates with
the immobilizer control unit (ICU) to execute immobilizer
function. The ECM sends request signal to the ICU. The
ECM receives response signal from the ICU. Both
communication signals are carried out through the
Keyword 2000 serial data link. If the ECM receives
wrong response signal from the ICU, this DTC will set.
Condition for Setting the DTC 

•  The ECM receives wrong immobilizer response

signal from the ICU. 

Action Taken When the DTC Sets 

•  The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails. 

•  The desired fuel injection quantity is set 0 mg/strk.

 

Condition for Clearing the MIL/DTC 

•  The ECM turns OFF the MIL when the diagnostic 

runs and does not fail. 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  Non programmed ECM may set this DTC. 
•  Electrical or magnetic interference may affect

intermittent condition. 

•  If an intermittent condition is suspected, refer to

Intermittent Conditions in this section. 

Notice:  

•  Keyword 2000 serial data link circuit problem may 

cause this DTC set. The scan tool will not 
communicate. Refer to scan tool Does Not 
Communicate with Keyword 2000 Device in this 
section. 

•  ECM with wrong specification may set this DTC. 
 

DTC P1612 (Symptom Code A) (Flash Code 56) 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Select the “Immobilizer” in the system selection 

menu. 

5.  Monitor the Diagnostic Trouble Code (DTC) Info 

Ordered By Priority with the scan tool. 

Does the immobilizer DTCs fail this ignition which 
begin with B? 

 

Go to Applicable 

DTC in Immobilizer 

Section 

Go to Step 3 

3 

Monitor the DTC Information with the scan tool. 
Does the DTC fail this ignition? 

 

Go to Step 4 

Go to Diagnostic 

Aids 

4 

Program or reprogram immobilizer function into the 
engine control module (ECM). Refer to Programming 
Engine Control Module (ECM) in immobilizer section.
Did you find and correct the condition? 

 

Go to Step 6 

Go to Step 5 

5 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 6 

 

6 

1.  Clear the DTCs with the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Monitor the DTC Information with the scan tool. 
Did the DTC fail this ignition? 

 

Go to Step 2 

Go to Step 7 

7 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

6E-220  Engine Control System (4JH1) 

DTC P1613 (Symptom Code A) (Flash Code 56) 

Circuit Description 
The engine control module (ECM) communicates with
the immobilizer control unit (ICU) to execute immobilizer
function. The ECM sends request signal to the ICU. The 
ECM receives response signal from the ICU. Both
communication signals are carried out through the
Keyword 2000 serial data link. If the ECM does not
detect response signal from the ICU, this DTC will set.
Condition for Setting the DTC 

• The ECM does not receive the immobilizer

response signal from the ICU. 

Action Taken When the DTC Sets 

•  The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails. 

•  The desired fuel injection quantity is set 0 mg/strk.

Condition for Clearing the MIL/DTC 

•  The ECM turns OFF the MIL when the diagnostic

runs and does not fail. 

•  A history DTC clears after 40 consecutive driving

cycles without a fault. Or clear with the scan tool. 

 

Diagnostic Aids 

•  Non programmed ECM may set this DTC. 
•  Transponder key problem may set this DTC. 
•  Antenna coil problem may set this DTC. 
•  Electrical or magnetic interference may affect

intermittent condition. 

•  If an intermittent condition is suspected, refer to

Intermittent Conditions in this section. 

Notice:  

•  Keyword 2000 serial data link circuit problem may 

cause this DTC set. The scan tool will not 
communicate. Refer to scan tool Does Not 
Communicate with Keyword 2000 Device in this 
section. 

•  ECM with wrong specification may set this DTC. 
 

DTC P1613 (Symptom Code A) (Flash Code 56) 
 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Select the “Immobilizer” in the system selection 

menu. 

5.  Monitor the Diagnostic Trouble Code (DTC) Info 

Ordered By Priority with the scan tool. 

Does the immobilizer DTCs fail this ignition which 
begin with B? 

 

Go to Applicable 

DTC in Immobilizer 

Section 

Go to Step 3 

3 

Monitor the DTC Information with the scan tool. 
Does the DTC fail this ignition? 

 

Go to Step 4 

Go to Diagnostic 

Aids 

4 

Program or reprogram immobilizer function into the 
engine control module (ECM). Refer to Programming 
Engine Control Module (ECM) in immobilizer section.
Did you find and correct the condition? 

 

Go to Step 6 

Go to Step 5 

5 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 6 

 

6 

1.  Clear the DTCs with the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Monitor the DTC Information with the scan tool. 
Did the DTC fail this ignition? 

 

Go to Step 2 

Go to Step 7 

7 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

 

Engine Control System (4JH1)  6E-221 

DTC P1614 (Symptom Code A) (Flash Code 56) 

Circuit Description 
The engine control module (ECM) communicates with
the immobilizer control unit (ICU) to execute immobilizer
function. The ECM sends request signal to the ICU. The
ECM receives response signal from the ICU. Both
communication signals are carried out through the
Keyword 2000 serial data link. If ICU receives wrong
immobilizer response signal from the transponder key,
this DTC will set. 
Condition for Setting the DTC 

•  The ICU receives wrong immobilizer response

signal from the transponder key. 

 

Action Taken When the DTC Sets 

•  The ECM illuminates the malfunction indicator 

lamp (MIL) when the diagnostic runs and fails. 

•  The desired fuel injection quantity is set 0 mg/strk.

Condition for Clearing the MIL/DTC 

•  The ECM turns OFF the MIL when the diagnostic 

runs and does not fail. 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  Non programmed ICU may set this DTC. 
•  Transponder key problem may set this DTC. 
•  ECM with wrong specification may set this DTC. 
 

DTC P1614 (Symptom Code A) (Flash Code 56) 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Select the “Immobilizer” in the system selection 

menu. 

5.  Monitor the Diagnostic Trouble Code (DTC) Info 

Ordered By Priority with the scan tool. 

Does the immobilizer DTCs fail this ignition which 
begin with B? 

 

Go to Applicable 

DTC in Immobilizer 

Section 

Go to Step 3 

3 

Monitor the DTC Information with the scan tool. 
Does the DTC fail this ignition? 

 

Go to Step 4 

Go to Diagnostic 

Aids 

4 

Program or reprogram immobilizer function into the 
immobilizer control unit (ICU). Refer to Programming 
Immobilizer Control Unit (ICU) in immobilizer 
section. 
Did you find and correct the condition? 

 

Go to Step 6 

Go to Step 5 

5 

Important: Replacement ICU must be programmed.
Replace the ICU. Refer to Immobilizer Control Unit 
(ICU) Replacement in the immobilizer section. 
Did you complete the replacement? 

 

Go to Step 6 

 

6 

1.  Clear the DTCs with the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Turn ON the ignition, with the engine OFF. 
4.  Monitor the DTC Information with the scan tool. 
Did the DTC fail this ignition? 

 

Go to Step 2 

Go to Step 7 

7 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK