2004 ISUZU TF SERIES Workshop Manual

belt wheel brake fluid oil ground clearance garage door opener

Page 1673 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–301
11 Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System

Page 1674 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–302 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE 3)
(FLASH CODE 22) FUEL REDUCTION CAUSED BY HIGH COOLANT
TEMPERATURE
DIAGNOSTIC TROUBLE CODE (D

6E–302 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE 3)
(FLASH CODE 22) FUEL REDUCTION CAUSED BY HIGH COOLANT
TEMPERATURE
DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE 7)
(FLASH CODE 22) FUEL REDUCTION CAUSED BY HIGH FUEL TEMPERATURE
DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE A)
(FLASH CODE 22) FUEL REDUCTION CAUSED BY LOW FUEL TEMPERATURE
Condition for setting the DTC and action taken when the DTC sets
Circuit Description
The engine coolant temperature (ECT) sensor is
installed on the coolant stream. High coolant
temperature produces a low resistance. The ECM
supplies 5 volts signal to the ECT sensor through
resisters in the ECM and measures the voltage. The
signal voltage will be low when the engine temperature
is hot.
The fuel temperature sensor is assembled inside of the
pump control unit (PSG). The signal of fuel temperature
is sent via the CAN-bus from the PSG to ECM.
If the engine coolant temperature is ex cessively high
condition, DTC P1173 (Symptom Code 3) will be stored.
If the fuel temperature is ex cessively high or low
condition, DTC P1173 (Symptom Code 7) or P1173
(Symptom Code A) will be stored.
Diagnostic Aids
An intermittent may be caused by the following:
Poor connections.
Misrouted harness.
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 “Coolant Temperature” or “Fuel Temperature”
display on the Tech2 while moving connectors and
wiring harness related to the sensor.
Diagnostic Trouble Code (DTC) P1173 (Symptom Code 3) (Flash Code 22) Fuel
Reduction Caused By High Coolant Temperature
Flash
CodeCode Symptom
CodeMIL DTC Name DTC Setting Condition Fail-Safe (Back Up)
22 P1173 3 OFF Fuel Reduction Caused By
High Coolant TemperatureExcessive high engine cool-
ant temperature is detected.No fa il-sa fe fun ctio n.
7 OFF Fuel Re ductio n Ca used By
High Fuel TemperatureFuel te mpe rature is mo re tha n
100 de g. C.PSG (pump contro l unit) con-
tro ls fuel inje ctio n qua ntity
based on engine speed and
fuel temperature.
A OFF Fuel Re ductio n Ca used By
Low Fuel TemperatureExcessive low fuel tempera-
ture is de te cted.No fa il-sa fe fun ctio n.
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 P1173 (Symptom Code 3) stored as
“Present Failure”?—Go to Step 3Refer to
Diagnostic Aids
and Go to Step
3

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ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–303
3 1. Using the Tech 2, ignition “On” and engine “Off”.
2. Select “F1: Clear DTC Information” in “F0:
Diagnostic Trouble Codes” wit

Page 1676 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–304 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
10 Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System

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ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–305
Diagnostic Trouble Code (DTC) P1173 (Symptom Code 7) (Flash Code 22) Fuel
Reduction Caused By High Fuel Temperature
Diagnostic Trouble Code (DTC)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–305
Diagnostic Trouble Code (DTC) P1173 (Symptom Code 7) (Flash Code 22) Fuel
Reduction Caused By High Fuel Temperature
Diagnostic Trouble Code (DTC) P1173 (Sy mptom Code A) (Flash Code 22) Fuel
Reduction Caused By Low Fuel Temperature
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 P1173 (Symptom Code 7) or P1173
(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 P1173 (Symptom Code 7) or P1173
(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—

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ISUZU TF SERIES 2004 Workshop Manual 6E–306 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P1335 (SYMPTOM CODE A)
(FLASH CODE 43) ENGINE SPEED OUTPUT CIRCUIT MALFUNCTION
Condition for setting the DTC and act

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ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–307
Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the “Engine Speed” display on the Tech2 whilem

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ISUZU TF SERIES 2004 Workshop Manual 6E–308 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6 If a oscilloscope is available, monitor the CKP sensor
output signal. Does the oscilloscope indicate correct
wav e form?
—Go to Step 13Not ava

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