1998 ISUZU TROOPER check engine

6E±97 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Verifies that the fault is present.
3. If DTC P0198 can be repeated only by duplicating
the Failure Records conditions, refer to the
ªTemperature vs. Resistance Valueº table. The
table may be used to test the OT sensor at various
temperatures to evaluate the possibility of a
ªshiftedº sensor that may be shorted above or below
a certain temperature. If this is the case, replace
the OT sensor. If the OT sensor appears to be OK,
the fault is intermittent; refer to
Diagnostic Aids.
Engine Oil Temperature Sensor

C
FOhms
Temperature vs. Resistance Values
(approximate)
80176332
25772796
15594450
DTC P0198 ± OT Sensor High Voltage

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON,º engine ªOFF.º
2. Observe the ªEng Oil Tempº display on the Tech 2.
Is the ªEng Oil Tempº below the specified value?
±39
C
(±38
F)
Go to Step 4Go to Step 3
31. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor the ª DTCº info for DTC
P0198.
Does the Tech 2 indicate DTC P0198 failed?
Ð
Refer to Test
Description
Refer to
Diagnostic
Aids
41. Disconnect the OT sensor electrical connector.
2. Jumper the OT signal circuit and the sensor ground
circuit together at the OT sensor harness
connector.
3. Observe the ªEng Oil Tempº display on the Tech 2.
Is the ªEng Oil Tempº at the specified value?
140
C
(284
F)
Go to Step 6Go to Step 5
51. Jumper the OT signal circuit at the OT sensor
harness connector to chassis ground.
2. Observe the ªEng Oil Tempº display on the Tech 2.
Is the ªEng Oil Tempº at the specified value?
140
C
(284
F)
Go to Step 7Go to Step 8
6Check for poor connections at the OT sensor and
replace terminals if necessary.
Did any terminals require replacement?
ÐVerify repairGo to Step 10
71. Ignition ªOFF.º
2. Disconnect the ECM, and check the OT sensor
ground circuit for an open.
3. If the OT sensor ground circuit is open, repair it as
necessary.
Was the OT sensor ground circuit open?
ÐVerify repairGo to Step 9

6E±98
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0198 ± OT Sensor High Voltage

 
StepNo Ye s Value(s) Action
81. Ignition ªOFF.º
2. Disconnect the OT, and check the OT signal circuit
for an open.
3. If the OT sensor signal circuit is open, repair it as
necessary.
Was the OT signal circuit open?
ÐVerify repairGo to Step 9
9Check for a poor sensor ground or OT signal circuit
terminal connection at the ECM and replace
terminal(s) if necessary.
Did any of the terminals need to be replaced?
ÐVerify repairGo to Step 11
10Replace the ECT sensor.
Is the action complete?
ÐVerify repairÐ
11Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairÐ

6E±100
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0201 ± Injector # 1 Circuit Fault

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Will the engine start?
ÐGo to Step 3
Go to Engine
Cranks But
Will Not Run
chart
31. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Does DTC P0201 reset?
ÐGo to Step 5Go to Step 4
41. Review the Freeze Frame data with the ignition
ªONº and the engine ªOFFº and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0201 reset?
ÐGo to Step 5Ð
5Check the Injector test.
Does the working noise confirm?
ÐGo to Step 6Go to Step 7
61. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Dose DTC P0201 reset?
ÐVerify repairGo to Step 7
7Check for an open circuit between the injector
connector and the ECM.
Was there an open circuit?
ÐGo to Step 8Go to Step 9
8Repair the open circuit.
Is the action complete?
ÐVerify repairÐ
9Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairGo to Step 10
10Replace the Injector (Refer to the Injector Group Sign
Programming).
Is the action complete?
ÐVerify repairÐ

6E±102
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0202 ± Injector # 2 Circuit Fault

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Will the engine start?
ÐGo to Step 3
Go to Engine
Cranks But
Will Not Run
chart
31. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Does DTC P0202 reset?
ÐGo to Step 5Go to Step 4
41. Review the Freeze Frame data with the ignition
ªONº and the engine ªOFFº and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0202 reset?
ÐGo to Step 5Ð
5Check the Injector test.
Does the working noise confirm?
ÐGo to Step 6Go to Step 7
61. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Dose DTC P0202 reset?
ÐVerify repairGo to Step 7
7Check for an open circuit between the injector
connector and the ECM.
Was there an open circuit?
ÐGo to Step 8Go to Step 9
8Repair the open circuit.
Is the action complete?
ÐVerify repairÐ
9Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairGo to Step 10
10Replace the Injector (Refer to the Injector Group Sign
Programming).
Is the action complete?
ÐVerify repairÐ

6E±104
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0203 ± Injector # 3 Circuit Fault

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Will the engine start?
ÐGo to Step 3
Go to Engine
Cranks But
Will Not Run
chart
31. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Does DTC P0203 reset?
ÐGo to Step 5Go to Step 4
41. Review the Freeze Frame data with the ignition
ªONº and the engine ªOFFº and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0203 reset?
ÐGo to Step 5Ð
5Check the Injector test.
Does the working noise confirm?
ÐGo to Step 6Go to Step 7
61. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Dose DTC P0203 reset?
ÐVerify repairGo to Step 7
7Check for an open circuit between the injector
connector and the ECM.
Was there an open circuit?
ÐGo to Step 8Go to Step 9
8Repair the open circuit.
Is the action complete?
ÐVerify repairÐ
9Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairGo to Step 10
10Replace the Injector (Refer to the Injector Group Sign
Programming).
Is the action complete?
ÐVerify repairÐ

6E±106
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0204 ± Injector #4 Circuit Fault

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Will the engine start?
ÐGo to Step 3
Go to Engine
Cranks But
Will Not Run
chart
31. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Does DTC P0204 reset?
ÐGo to Step 5Go to Step 4
41. Review the Freeze Frame data with the ignition
ªONº and the engine ªOFFº and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0204 reset?
ÐGo to Step 5Ð
5Check the Injector test.
Does the working noise confirm?
ÐGo to Step 6Go to Step 7
61. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Dose DTC P0204 reset?
ÐVerify repairGo to Step 7
7Check for an open circuit between the injector
connector and the ECM.
Was there an open circuit?
ÐGo to Step 8Go to Step 9
8Repair the open circuit.
Is the action complete?
ÐVerify repairÐ
9Is the action complete?ÐVerify repairGo to Step 10
10Replace the Injector (Refer to the Injector Group Sign
Programming).
Is the action complete?
ÐVerify repairÐ

6E±107 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0217 (Flash DTC 22)
High Coolant Temp Waring
060RW129
Circuit Description
The engine coolant temperature (ECT) sensor is a
thermistor mounted on a coolant crossover pipe at the
rear of the engine. The Engine Control Module ECM
applies a voltage (about 5 volts) through a pull-up resistor
to the ECT signal circuit. When the engine coolant is cold,
the sensor (thermistor) resistance is high, therefore the
ECM will measure a high signal voltage. As the engine
coolant warms, the sensor resistance becomes lower,
and the ECT signal voltage measured at the ECM drops.
Action Taken When the DTC Sets

The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

DTC P0217 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:

Poor connection at ECM ± Inspect harness connectors
for backed-out terminals, improper mating, brokenlocks, 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
ECT display on the Tech 2 while moving connectors
and wiring harnesses related to the ECT sensor. A
change in the ECT display will indicate the location of
the fault.
If DTC P0217 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
If it is determined that the DTC occurs intermittently.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Verifies that the fault is present.
3. If DTC P0117 can be repeated only by duplicating
the Failure Records conditions, refer to the
ªTemperature vs. Resistance Valuesº table. The
table may be used to test the ECT sensor at various
temperatures to evaluate the possibility of a
ªshiftedº sensor that may be shorted above or below
a certain temperature. If this is the case, replace
the ECT sensor. If the ECT sensor appears to be
OK, the fault is intermittent; refer to
Diagnostic Aids.

6E±108
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0217 ± High Coolant Temp Waring

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON,º engine ªOFF.º
2. Observe the ªEng Cool Tempº display on the Tech 2.
Is the ªEng Cool Tempº below the specified value?
11 0
CGo to Step 6Go to Step 3
3Check the engine coolant quantity
Was the engine coolant appropriate quantity?
ÐGo to Step 6Go to Step 4
4Check a leak from EC circuit.
Was the EC leaked from EC circuit?
ÐGo to Step 5Go to Step 6
5Repair the EC circuit.
Is the action complete?
ÐVerify repairÐ
61. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor ª DTCº info for DTC P0217.
Does the Tech 2 indicate DTC P0217 failed this
ignition?
ÐGo to Step 7Ð
71. Ignition ªOFFº.
2. Check the Thermostat.
3. If the Thermostat is damaged, repair it as
necessary.
Was the Thermostat damaged?
ÐGo to Step 8Go to Step 9
8Replace the Thermostat.
Is the action complete?
ÐVerify repairÐ
91. Check the Radiator.
2. If the Radiator is damaged, repair it as necessary.
Was the Radiator damaged?
ÐGo to Step 10Go to Step 11
10Repair the Radiator.
Is the action complete?
ÐVerify repairÐ
111. Check the EC circuit in the Engine.
2. Observe the ªEng Data Listº display on the Tech 2.
3. If the EC circuit in the Engine is damaged, repair it
as necessary.
Was the EC circuit damaged?
Refer to Data
List
Go to Step 12Go to Step 6
12Repair the EC circuit.
Is the action complete?
ÐVerify repairÐ