Fuel Injector Coil Test Procedure And Fuel Injector Balance Test Procedure; Test Description - Isuzu 1999 RODEO Workshop Manual

6E1–60
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
monitored with a Tech 2. Ideal long term fuel trim values
are around 0%; for a lean HO2S signal, the PCM will add
fuel, resulting in a fuel trim value above 0%. Some
variations in fuel trim values are normal because all
engines are not exactly the same. If the evaporative
emission canister purge is ON, the long term fuel trim may
be as low as –38%. If the long term fuel trim values are
greater than +23%, for items which can cause a lean
HO2S signal, refer to DTC P0131, DTC P0171, and DTC
1171.
FUEL INJECTOR COIL TEST
PROCEDURE AND FUEL INJECTOR
BALANCE TEST PROCEDURE

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2. Relieve the fuel pressure by connecting the J
34730–1 Fuel Pressure Gauge to the fuel pressure
connection on the fuel rail.
CAUTION: In order to reduce the risk of fire and
personal injury, wrap a shop towel around the fuel
pressure connection. The towel will absorb any fuel
leakage that occurs during the connection of the fuel
pressure gauge. Place the towel in an approved
container when the connection of the fuel pressure
gauge is complete.
Place the fuel pressure gauge bleed hose in an
approved gasoline container.
With the ignition switch OFF open the valve on the
fuel pressure gauge.
3.Record the lowest voltage displayed by the DVM
after the first second of the test. (During the first
second, voltage displayed by the DVM may be
inaccurate due to the initial current surge.)
Injector Specifications:
Resistance Ohms
11.8 – 12.6
f The voltage displayed by the DVM should be within
the specified range.
f The voltage displayed by the DVM may increase
throughout the test as the fuel injector windings
warm and the resistance of the fuel injector windings
changes.
f An erratic voltage reading (large fluctuations in
voltage that do not stabilize) indicates an
intermittent connection within the fuel injector.
5. Injector Specifications:
Highest Acceptable Voltage
T32003
Reading Above/Below
35°C/10°C (95°F/50°F)
9.5 Volts
7. The Fuel Injector Balance Test portion of this chart
(Step 7 through Step 11) checks the mechanical
(fuel delivery) portion of the fuel injector. An engine
cool–down period of 10 minutes is necessary in
order to avoid irregular fuel pressure readings due
to "Hot Soak" fuel boiling.
Voltage Specification at
10°C–35°C (50°F–95°F)
5.7 – 6.6
Acceptable
Subtracted Value
0.6 Volt