Isuzu 1999 RODEO Workshop Manual page 691

6E1–64
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Injector Coil Test Procedure (Steps 1–6) And Injector Balance Test Procedure
Step
9 1. Connect the J 39021–5V Fuel Injector Tester and
J39021–90 Injector Switch Box to the fuel injector
harness connector.
2. Set the amperage supply selector switch on the fuel
injector tester to the "Balance Test" 0.5–2.5 amp
position.
3. Using the Tech 2 turn the fuel pump ON then OFF in
order to pressurize the fuel system.
4. Record the fuel pressure indicated by the fuel
pressure gauge after the fuel pressure stabilizes.
This is the first pressure reading.
5. Energize the fuel injector by depressing the Push to
Start Test button on the fuel injector tester.
6. Record the fuel pressure indicated by the fuel
pressure gauge after the fuel pressure gauge
needle has stopped moving. This is the second
pressure reading.
7. Repeat steps 1 through 6 for each fuel injector.
8. Subtract the second pressure reading from the first
pressure reading for one fuel injector. The result is
the pressure drop value.
9. Obtain a pressure drop value for each fuel injector.
10.Add all of the individual pressure drop values. This
is the total pressure drop.
11. Divide the total pressure drop by the number of fuel
injectors. This is the average pressure drop.
Does any fuel injector have a pressure drop value that
is either higher than the average pressure drop or lower
than the average pressure drop by the specified value?
10 Re–test any fuel injector that does not meet the
specification. Refer to the procedure in step 11.
NOTE: Do not repeat any portion of this test before
running the engine in order to prevent the engine from
flooding.
Does any fuel injector still have a pressure drop value
that is either higher than the average pressure drop or
lower than the average pressure drop by the specified
value?
11 Replace the faulty fuel injector(s). Refer to Fuel
Injector.
Is the action complete?
(Steps 7–11) (Cont'd)
Action Value(s) Yes
10 kPa (1.5
Go to Step 10
psi)
10 kPa (1.5
Go to Step 11
psi)
— Verify repair
No
Go to OBD
System
Check
Go to
Symptoms
—