1998 ISUZU TROOPER Service Repair Manual

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Page 1297 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±180
ENGINE DRIVEABILITY AND EMISSIONS
If the test light blinks while cranking, the PCM and
the wiring to the injectors are OK. The Fuel Injector
Coil Test Procedure will check if the injectors ar

Page 1298 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±181 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0204 ± Injector 4 Control Circuit
StepNo Ye s Value(s) Action
71. Disconnect the PCM connector for the affected
injectors.
2. With a test ligh

Page 1299 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±182
ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0205 Injector 5 Control Circuit
D06RW034
Circuit Description
The powertrain control module (PCM) has six individual
injector dr

6E±182
ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0205 Injector 5 Control Circuit
D06RW034
Circuit Description
The powertrain control module (PCM) has six individual
injector driver circuits. Each controls an injector. When
the driver circuit is grounded by the PCM, the injector is
activated. The PCM monitors the current in each driver
circuit. If the voltage is not what the PCM expects to
monitor on the circuit, a DTC is set. This DTC is also set if
an injector driver is shorted to voltage or if there is an open
circuit.
Conditions for Setting the DTC
The battery voltage is more than 9 volts.
The engine is turning, determined by the 58X
crankshaft position input signal.
The injector voltage does not equal the ignition voltage
when the injector is commanded ªOFFº or the injector
voltage does not equal 0 volts when the injector is
commanded ªON.º
The above conditions are met for 15 seconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
The PCM 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 P0205 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An injector driver circuit that is open or shorted to voltage
will cause a DTC P0205 to set. It will also cause a misfire
due to an inoperative injector. A misfire DTC will also be
set indicating which cylinder is inoperative.
Long term and short term fuel trims that are excessively
high or low are a good indication that an injector is faulty.
Use Fuel Injector Coil Test Procedure to check for faulty
injectors.
Test Description
The number(s) below refer to the step number(s) on the
Diagnostic Chart.
3. This step determines if DTC P0205 is the result of a
hard failure or an intermittent condition.
5. A special injector test connector is provided so that
the injectors can be electrically tested without
removal of the manifold. On the Trooper, the
special 7-way gray connector is located at the front
of the charcoal canister. The test connector can be
identified by the blue connector lock which is
tethered to the wiring harness. If the light for
cylinder 5 is ªONº steady before cranking the engine
as well as while cranking the engine, then the
injector driver circuit is shorted to ground.

Page 1300 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±183 ENGINE DRIVEABILITY AND EMISSIONS
If the test light blinks while cranking, the PCM and
the wiring to the injectors are OK. The Fuel Injector
Coil Test Procedure will check if the injectors are

Page 1301 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±184
ENGINE DRIVEABILITY AND EMISSIONS
DTC P0205 ± Injector 5 Control Circuit
StepNo Ye s Value(s) Action
71. Disconnect the PCM connector for the affected
injectors.
2. With a test ligh

Page 1302 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±185 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0206 Injector 6 Control Circuit
D06RW034
Circuit Description
The powertrain control module (PCM) has six individual
injector dr

6E±185 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0206 Injector 6 Control Circuit
D06RW034
Circuit Description
The powertrain control module (PCM) has six individual
injector driver circuits. Each controls an injector. When
the driver circuit is grounded by the PCM, the injector is
activated. The PCM monitors the current in each driver
circuit. The voltage on each driver is monitored to detect
a fault. If the voltage is not what the PCM expects to
monitor on the circuit, a DTC is set. This DTC is also set if
an injector driver is shorted to voltage or if there is an open
circuit.
Conditions for Setting the DTC
The battery voltage is more than 9 volts.
The engine is turning, determined by 58X crankshaft
position input signal.
The injector voltage does not equal the ignition voltage
when the injector is commanded ªOFFº or the injector
voltage does not equal 0 volts when the injector is
commanded ªON.º
The above conditions are met for 15 seconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
The PCM 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 P0206 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An injector driver circuit that is open or shorted to voltage
will cause a DTC P0206 to set. It will also cause a misfire
due to an inoperative injector. A misfire DTC will also be
set indicating which cylinder is inoperative.
Long term and short term fuel trims that are excessively
high or low are a good indication that an injector is faulty.
Use Fuel Injector Coil Test Procedure to check for faulty
injectors.
Test Description
The number(s) below refer to the step number(s) on the
Diagnostic Chart.
3. This step determines if DTC P0206 is the result of a
hard failure or an intermittent condition.
5. A special injector test connector is provided so that
the injectors can be electrically tested without
removal of the manifold. On the Trooper, the
special 7-way gray connector is located at the front
of the charcoal canister. The test connector can be
identified by the blue connector lock which is
tethered to the wiring harness. If the light for
cylinder 6 is ªONº steady before cranking the engine
as well as while cranking the engine, then the
injector driver circuit is shorted to ground.

Page 1303 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±186
ENGINE DRIVEABILITY AND EMISSIONS
If the test light blinks while cranking, the PCM and
the wiring to the injectors are OK. The Fuel Injector
Coil Test Procedure will check if the injectors are

Page 1304 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±187 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0206 ± Injector 6 Control Circuit
StepNo Ye s Value(s) Action
71. Disconnect the PCM connector for the affected
injectors.
2. With a test ligh

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