2004 ISUZU TF SERIES Workshop Manual

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Page 1721 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–349
DIAGNOSTIC TROUBLE CODE (DTC) P1651 (SYMPTOM CODE A)
(FLASH CODE 45) CAN MALFUNCTION
DIAGNOSTIC TROUBLE CODE (DTC) P1651 (SYMPTOM CODE B)
(FLASH

Page 1722 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–350 4JA1/4JH1 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 ha

6E–350 4JA1/4JH1 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 damagedterminals, 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
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check
2 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 3Refer to
Diagnostic Aids
and Go to Step
3
3 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 4Refer to
Diagnostic Aids
4 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
5 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 immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure. —Go to Step 6Go to Step 7
6 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 immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Verify repair—
7 Replace the injection pump assembly.
Is the action complete?—Verify repair—

Page 1723 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–351
Diagnostic Trouble Code (DTC) P1651 (Symptom Code B) (Flash Code 45)
CAN Receives Error
Step Action Value(s) Yes No
1Was the “On-Board Diagnosti

Page 1724 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–352 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
8 Using the DVM and check the CAN high circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as

Page 1725 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–353
9 Using the DVM and check the CAN low circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as

Page 1726 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–354 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
11 Repair the short to voltage circuit between the ECM
and PSG (pump control unit).
Is the action complete?
—Verify repair—
12 Using the DVM a

Page 1727 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–355
15 Check any accessory parts which may cause electric
interference.
Was the problem found?—Remove the
accessory parts
and verify repair Go to S

Page 1728 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–356 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P1690 (SYMPTOM CODE 4)
(FLASH CODE 77) CHECK ENGINE LAMP (MIL) CIRCUIT VOLTAGE LOW
DIAGNOSTIC TROUBLE CODE (DTC) P16

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