2004 ISUZU TF SERIES Workshop Manual

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Page 1529 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –157
Diagnostic Trouble Code (DTC) P0110 (Sy mptom Code 2) (Flash Code 23)
Intake Air Temperature (IAT) Sensor Circuit Low Input
Step Action Value(s)

Page 1530 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E –158 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6 Using the DVM and check the IAT sensor.
1. Ignition “Off ”, engine “Off ”.
2. Disconnect MAF & IAT sensor connector.
3. Measure

Page 1531 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –159
7 Using the DVM and check the IAT sensor signal
circuit.
Breaker box is available:
1. Ignition “Off ”, engine “Off ”.
2. Install t

Page 1532 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–160 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P0115 (SYMPTOM CODE 1)
(FLASH CODE 14) ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
HIGH INPUT
DIAGNOSTIC TROUBLE CODE

Page 1533 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –161
a high resistance.
The ECM supplies 5 volts signal to the ECT sensor
through resisters in the ECM and measures the voltage.
The signal voltage wi

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –161
a high 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 high when the engine
temperature is cold, and it will be low when the engine
temperature is hot.
The output voltage ex cessively high or low, DTC P0115
(Symptom Code 1) or P0115 (Symptom Code 2) 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-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 ” display on the Tech2 while
moving connectors and wiring harness related to the
sensor.
Diagnostic Trouble Code (DTC) P0115 (Sy mptom Code 1) (Flash Code 14)
Engine Coolant Temperature Sensor Circuit High Input
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check ”
performed?
— Go to Step 2 Go 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 P0115 (Symptom Code 1) stored as
“ Present Failure ”? —Go to Step 3 Refer 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 P0115 (Symptom Code 1) stored in this
ignition cycle? —Go to Step 4 Refer to
Diagnostic Aids and Go to Step
4
4 Check for poor/faulty connection at the ECT sensor or ECM connector. If a poor/faulty connection is found,
repair as necessary.
Was the problem found?
— Verify repair Go to Step 5
5 Visually check the ECT sensor. Was the problem found? —Go to Step 12 Go to Step 6
932
1
89 E-41
C-57(B)

Page 1534 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E –162 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6 Using the DVM and check the ECT sensor.
1. Ignition “Off ”, engine “Off ”.
2. Disconnect ECT sensor connector.
3. Measure the r

Page 1535 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –163
9 Repair the short to voltage circuit between the ECM
and ECT sensor.
Was the problem solved?
— Verify repair Go to Step 14
10 Using the DV

Page 1536 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–164 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
12 Substitute a known good ECT sensor assembly and
recheck.
Was the problem solved?—Go to Step 13Go to Step 14
13 Replace the ECT sensor.
Is th

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