Injector Coil Test Procedure (Steps 1-6) And Injector Balance Test Procedure (Steps 7-11) - Isuzu Trooper 1999 Workshop Manual

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Turn the engine "OFF."
NOTE: In order to prevent flooding of a single cylinder
and possible engine damage, relieve the fuel pressure
before performing the fuel injector coil test procedure.
2. Relieve the fuel pressure. Refer to Test Description
Number 2.
3. Connect the J 39021-5V Fuel Injector Tester to B+
and ground, and to the J 39021-90 Injector Switch
Box.
4. Connect the injector switch box to the grey fuel
injector harness connector located on the front of
the EVAP canister bracket.
5. Set the amperage supply selector switch on the fuel
injector tester to the "Coil Test" 0.5 amp position.
6. Connect the leads from the J 39200 Digital
Voltmeter (DVM) to the injector tester. Refer to the
illustrations associated with the test description.
7. Set the DVM to the tenths scale (0.0).
8. Observe the engine coolant temperature.
Is the engine coolant temperature within the specified
values?
3 1. Set injector switch box injector #1.
2. Press the "Push to Start Test" button on the fuel
injector tester.
3. Observe the voltage reading on the DVM.
IMPORTANT: The voltage reading may rise during the
test.
4. Record the lowest voltage observed after the first
second of the test.
5. Set the injector switch box to the next injector and
repeat steps 2, 3, and 4.
Did any fuel injector have an erratic voltage reading
(large fluctuations in voltage that did not stabilize) or a
voltage reading outside of the specified values?
4 Replace the faulty fuel injector(s). Refer to Fuel
Injector.
Is the action complete?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
(Steps 7-11)
Action Value(s) Yes
— Go to Step 2
10°C (50°F)
to 35°C
(95°F) Go to Step 3
Go to Step 4
5.7-6.6 V
— Go to Step 7
6E–67
No
Go to OBD
System
Check
Go to Step 5
Go to Step 7
—