7 - 28 Symptoms 5.0/5.7/6.0/8.1L
MEFI 4 - PCM
OFF
V-AC
V-DC
mV
mA
A
HA
POS
NEG
FUEL INJECTOR
TESTER
INJECTOR
SWITCH BOX
J39021-210
LOW VEHICLE BATTERY
READY TO TEST
TEST IN PROGRESS
AMPERAGE SUPPLY SELECTOR SWITCH
Coil Test
4 amp
2.5 amp
0.5 amp
Balance Test
4 amp
0.5-2.5
amp
PUSH TO START TEST
-
+
INJECTOR
CONNECTOR
FUEL INJECTOR
TESTER J 39021
VEHICLE BATTERY
DIGITAL VOLT
OHM
METER
(DVOM)
RS 22501
Fuel Injector Coil Test
Test Description
2. This is the set-up step for performing the Fuel Injector
Coil Test Procedure. In addition to following the steps in
this diagnostic table, also read the instructions included
with the tools used to perform this test procedure.
3. The engine coolant temperature affects the ability of
the Fuel Injector Tester to detect a faulty Fuel Injector.
If the engine coolant temperature is NOT between
50°F and 95°F, allow the engine to warm or cool as
necessary.
4. Due to a current surge, the fi rst second of the voltage
displayed by the DVOM may be inaccurate; therefore,
begin recordingafter the fi rst second of the voltage
reading. The voltage displayed by the DVOM should
be within the specifi ed range. The voltage displayed
by the DVOM may increase throughout the test as
the fuel injector windings warm up and the resistance
changes. An erratic voltage reading (large fl uctuations
in voltage that do not stabilize) indicates an intermittent
connection within the fuel injector.
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