Content .. 78 79 80 81 ..

Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 80

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

6E–315

Check any accessory parts which may cause electric
interference.
Was the problem found?

—

Remove the

accessory parts
and verify repair

Go to Step 15

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 16

Substitute a known good ECM and recheck.
Was the problem solved?
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.

—

Go to Step 17

Go to Step 18

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

—

Replace the injection pump assembly.
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

6E–316

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

Diagnostic Trouble Code (DTC) P1650 (Symptom Code B) (Flash Code 44) CAN

Device Hang-up

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 P1650 (Symptom Code B) 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 P1650 (Symptom Code B) 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

—

Go to Step 6

Go to Step 7

—

Verify repair

—

Replace the injection pump assembly.
Is the action complete?

—

Verify repair

—

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

6E–317

DIAGNOSTIC TROUBLE CODE (DTC) P1651 (SYMPTOM CODE A)

(FLASH CODE 45) CAN MALFUNCTION (PSG)

DIAGNOSTIC TROUBLE CODE (DTC) P1651 (SYMPTOM CODE B)

(FLASH CODE 45) CAN RECEIVES ERROR

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

Circuit Description

The interchange of data between the engine control
module (ECM) and the pump control unit (PSG) is
performed via a CAN-bus system. The individual CAN-
bus systems are connected via two interfaces and can
exchange information and data. This allows control
modules that are connected to different CAN-bus

systems to communicate.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.

• Misrouted harness.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P1651

CAN Malfunction (PSG)

The PSG (pump control unit)
does not recognize CAN sig-
nal from the CAN controller.

1. MAB (fuel cutoff solenoid

valve) is operated.

2. Desired injection quantity

becomes 0mg/strk.

CAN Receives Error

The ECM does not read CAN
signal from the PSG (pump
control unit).

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–318

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

• Rubbed through wire insulation.

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

• Poor connection at ECM and PSG-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 P1651 display on the Tech2 while moving
connectors and wiring harnesses.

Diagnostic Trouble Code (DTC) P1651 (Symptom Code A) (Flash Code 45) CAN

Malfunction (PSG)

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 P1651 (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 P1651 (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

—

Go to Step 6

Go to Step 7

—

Verify repair

—

Replace the injection pump assembly.
Is the action complete?

—

Verify repair

—

Content .. 78 79 80 81 ..