Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual - part 77

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–303

DIAGNOSTIC TROUBLE CODE (DTC) P1614 (SYMPTOM CODE A)

(FLASH CODE 56) WRONG TRANSPONDER KEY

Condition for setting the DTC and action taken when the DTC sets

Circuit Description

The ECM decides whether that is an abnormality in the
immobiliser control system. DTC P1614 (Symptom
Code A) is recorded when received immobiliser
response signal was not correct from the transponder
key.

Diagnostic Aids

Check for the following conditions:

• Poor connection at ECM and immobiliser control unit-

Inspect harness connectors for backed out terminals,
improper mating, broken locks, improperly formed or
damaged terminals, and poor terminal to wire
connection.

• Damaged harness-Inspect the wiring harness for

damage. If the harness appears to be OK, observe
the DTC P1614 display on the Tech2 while moving
connectors and wiring harnesses.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P1614

Wrong Transponder Key

Received response signal is
not correct from the transpon-
der key.

1. Engine does not start.
2. Check engine lamp flash.

Ignition
SW

Meter
15A

6 15

Batt

0.5
RED/
WHT

0.5
ORG/
BLU

0.5
BRN/
YEL

0.5
BLK/
RED

0.5
BLU/
WHT

0.5 BLU/BLK

0.5
WHT

2.0
BLK

VSS

0.85
YEL

Imnobiliser

Control Unit

0.5
BRN/
YEL

0.85
YEL

Glow

Check

Engine

Tacho

Meter

Speed

Meter

A/T

TCM

µP

Engine
Control
Module
(ECM)

6E–304

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

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

Wrong Transponder Key

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

1. Connect the Tech 2.

2. Review and record the failure information.

3. Select “F0: Read DTC Infor As Stored By ECU” in

“F0: Diagnostic Trouble Codes”.

Is the DTC P1614 (Symptom Code A) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Select “F1: Clear DTC Information” in “F0:

Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.

3. Operate the vehicle and monitor the “F0: Read

DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.

Was the DTC P1614 (Symptom Code A) stored in this
ignition cycle?

—

Go to Step 4

Refer to

Diagnostic Aids

and Go to Step

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Select “Immobiliser” in the system selection menu

“Body”.

3. Select “Read DTC Info Ordered By Priority” in the

“Diagnostic Trouble Code”.

Was the any DTC's B**** stored in this ignition cycle?

—

Refer to

“Immobiliser

Workshop

Manual” & Go

to DTC Chart

B****

Go to Step 5

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 6

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must e
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

—

Verify repair

—

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–305

DIAGNOSTIC TROUBLE CODE (DTC) P1625 (SYMPTOM CODE A)

(FLASH CODE 76) ECM MAIN RELAY SWITCHED OFF TOO EARLY

DIAGNOSTIC TROUBLE CODE (DTC) P1625 (SYMPTOM CODE B)

(FLASH CODE 76) ECM MAIN RELAY SWITCHED OFF TOO LATE

Condition for setting the DTC and action taken when the DTC sets

Circuit Description

The ECM switches ECM main relay to operate ECM and
other sensors or controller.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.

• Misrouted harness.

• Rubbed through wire insulation.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P1625

OFF

ECM Main Relay Switched
Off Too Early

When ignition switch was
turned off, timing of the ECM
main relay turning off is too
early.

No fail-safe function.

OFF

ECM Main Relay Switched
Off Too Late

When ignition switch was
turned off, timing of the ECM
main relay turning off is too
late or does not off.

16 15 14 13 12 11 10 9

8 7 6 5 4 3 2 1

Battery
Voltage

0.5
RED/
YEL

2.0
BLU/
RED

PSG(Pump Control Unit)

Injection
Pump

0.5
WHT

2.0
BLU/
RED

0.5
BLU/
BLK

0.5
RED

0.5
ORG

100

105

0.5
PNK

2.0
BLK

µP

CAN
Controller

Batt

µP

0.5
BLU

Stop
Light
10A

1.25
BLK

µP

Engine
Control
Module
(ECM)

ECM
Main Relay

6E–306

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

• Broken wire inside the insulation.
Check for the following conditions:

• Poor connection at ECM-Inspect harness connectors

for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

• Damaged harness-Inspect the wiring harness for

damage. If the harness appears to be OK, observe
the “Main Relay” display on the Tech2 while moving
connectors and wiring harnesses. A change in the
display will indicate the location of the fault.

Diagnostic Trouble Code (DTC) P1625 (Symptom Code A) (Flash Code 76) ECM

Main Relay Switched Off Too Early

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

1. Connect the Tech 2.

2. Review and record the failure information.

3. Select “F0: Read DTC Infor As Stored By ECU” in

“F0: Diagnostic Trouble Codes”.

Is the DTC P1625 (Symptom Code A) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Select “F1: Clear DTC Information” in “F0:

Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.

3. Operate the vehicle and monitor the “F0: Read

DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.

Was the DTC P1625 (Symptom Code A) stored in this
ignition cycle?

—

Go to Step 4

Refer to

Diagnostic Aids

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 5

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

—

Verify repair

—

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