Mitsubishi 1989-1993 GALANT Service Manual page 293

Regular waveform
HARNESS INSPECTION
harness side
connector
connector
connector
Using Oscilloscope
shown in the circuit diagram, and check the wave form.
Check for continuity between volume
air flow sensor and multiport fuel in-
jection relay.
l
nector: Disconnected
Volume air flow sensor connec-
l
tor: Disconnected
connector
NOTE
Touch the circuit tester probes to
both ends of the harness
Check for continuity of the ground
circuit.
tor: Disconnected
Check for broken wire or short-circuit
module harness
to ground, between volume air flow
and engine control module.
sensor
Volume air flow sensor connec-
l
tor: Disconnected
Engine control module connec-
l
tor: Disconnected
Measure the impressed voltage.
Disconnected
tor:
Engine control module connec-
l
tor: Connected
Ignition switch: ON
l
I TSB Revision
On-Vehicle Inspection of MFI
Voltage (V)
4.8 - 5.2
OK
I
4
O K
Repair the
harness.