Mitsubishi 3000GT 1991 Service Manual page 209

FUEL SYSTEM
Normal waveform
HARNESS INSPECTION
1
Harness side
Harness side
connector
H arness side
connector
Using Oscilloscope
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform at
the drive side of each injector.
Measure the power supply voltage of
the front bank injector.
Connector: Disconnected
l
Ignition switch: ON
l
Measure the power supply voltage of
the rear bank injector.
Connector: Disconnected
l
Ignition switch: ON
l
Voltage (VI
Check for an open-circuit, or a short-
circuit between the front bank injector
and the engine control unit.
Injector connector: Disconnected
l
Engine control unit connector:
l
Disconnected
TSB Revision
Repair the
harness.
Control relay)
Repair the
harness.
trol relay)