2004 ISUZU TF SERIES Workshop Manual

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Page 2169 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-173
DIAGNOSTIC TROUBLE CODE (DTC) P0118 (FLASH CODE 14) ENGINE
COOLANT TEMPERATURE (ECT) SENSOR HIGH INPUT

RUW46EMF000201

Condition For Setting T

Page 2170 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-174 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0118 (Flash Code 14) Engine Coolant
Temperature (ECT) Sensor High Input
Step Action Value (s) Yes No
1
Was the "O

Page 2171 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-175
Step Action Value (s) Yes No
6
Using the DVM and check the ECT sensor.
1. Ignition "Off", engine "Off".
2. Disconnect ECT sensor connector.

Page 2172 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-176 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
9
Repair the short to voltage circuit between the ECM
and ECT sensor.
Was the problem solved?
E-60(A)
E-69

Page 2173 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-177
Step Action Value (s) Yes No
11

Using the DVM and check the ECT sensor ground
circuit.
Breaker box is available:
1. Ignition "Off", engine

Page 2174 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-178 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
15
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of

Page 2175 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-179
DIAGNOSTIC TROUBLE CODE (DTC) P0121 (FLASH CODE 21) THROTTLE
POSITION SENSOR (TPS) CIRCUIT RANGE/PERFORMANCE

RUW46EMF000101

Condition For Set

Page 2176 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-180 3.5L ENGINE DRIVEABILITY AND EMISSIONS
CIRCUIT DESCRIPTION
The TPS circuit provides a voltage signal that changes
relative to throttle blade angle. The signal voltage will
vary from about 0.6

6E-180 3.5L ENGINE DRIVEABILITY AND EMISSIONS
CIRCUIT DESCRIPTION
The TPS circuit provides a voltage signal that changes
relative to throttle blade angle. The signal voltage will
vary from about 0.6 volts at closed throttle to about 4.5
volts at wide open throttle (WOT).
The TPS signal is one of the most important inputs
used by the Engine Control Module (ECM) for fuel
control and many of the ECM-controlled outputs. The
ECM monitors throttle position and compares actual
throttle position from the TPS to a predicted TPS value
calculated from engine speed. If the ECM detects an
out-of-range condition, DTC P0121 will set.

DIAGNOSTIC AIDS
Check for the following conditions:
Poor connection at ECM – Inspect harness
connectors for backed-out terminals, imprope
r
mating, broken locks improperly formed or damaged
terminals, and poor terminal-to-wire connection.
Damaged harness –Inspect the wiring harness fo
r
damage. If the harness appears to be OK, observe
the ECT display on the Tech 2 while moving
connectors and wiring harnesses related to the
sensor. A change in the display will indicate the
location of the fault.
If DTC P0121 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.

Diagnostic Trouble Code (DTC) P0121 (Flash Code 21) Throttle Position
Sensor (TPS) Circuit Range/Performance
Step Action Value (s) Yes No
1
Was 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 By Priority" in "F0:
Diagnostic Trouble Code".
Is the DTC P0121 stored as "Present Failure"?
- Go to Step 3 Refer to
Diagnostic Aids
and Go to Step 3
3
1. Using the Tech2, ignition "On" and engine "Off".
2. Select "Clear DTC Information" with the Tech2 and
clear the DTC information.
3. Operate the vehicle and monitor the "F5: Failed
This Ignition" in "F2: DTC Information"
Was the DTC P0121 stored in this ignition cycle?
- Go to Step 4 Refer to
Diagnostic Aids
and Go to Step 4
4

1. Using the Tech 2, ignition "On" and engine "Off".
2. Monitor the "Throttle Position" in the data display.
Does the Tech 2 indicate correct "Throttle Position"
from 0% to 100% depending on accelerator pedal
operation?
- Go to Step 6 Go to Step 5
5
1. Using the Tech 2, ignition "On" and engine "Off
2. Monitor the "Throttle Position" in the data display.
3. Adjust the TPS within 0% to 100%.
Was the problem solved?
- Verify repair Go to Step 12

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