Isuzu 2000 Trooper Workshop Manual page 1120

5. A special injector test connector is provided so that
the injectors can be electrically tested without
removal of the manifold. The test connector can be
identified by the blue connector lock which is
tethered to the wiring harness. If the light for
cylinder 4 is "ON" steady before cranking the engine
as well as while cranking the engine, then the
injector driver circuit is shorted to ground.
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 faulty.
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Will the engine start?
3 1. Install the Tech 2. Clear the DTC.
2. Idle the engine for one minute.
Does DTC P0204 reset?
4 1. Review the Freeze Frame data with the ignition
"ON" and the engine "OFF" and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0204 reset?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
R321057
DTC P0204 – Injector 4 Control Circuit
Action
7. Because the test light was "ON" steady, voltage to
the injector is OK, but the driver circuit is grounded
at all times. This step determines if the circuit is
shorted to ground or the PCM is faulty.
9. The reading should be about 12-14m.
10.Locating the open in the harness or in the injector
will require removal of the manifold to provide
access.
Value(s)
— Go to Step 2
Go to Step 3
—
— Go to Step 5
— Go to Step 5
6E–251
Yes No
Go to OBD
System
Check
Go to Engine
Cranks But
Will Not Run
chart
Go to Step 4
Go to
Diagnostic
Aids