Mitsubishi 1989-1993 GALANT Service Manual page 404

FUEL SYSTEM <DOHC>
INSPECTION
Using Scan tool
Data display
Data 12 Sensor de-
reading
volume (fre-
NOTE
The volume air flow sensor output frequency may be about 10% higher than indicated above when the vehicle is new
[driven approximately 500 km (300 miles) or less].
Regular waveform
HARNESS INSPECTION
connector
Harness side
connector
Inspection conditions
. Engine coolant
temperature: 85-95°C
. Lights, cooling fan, elec-
. Transaxle: neutral (PJT
models: "P" range)
Using Oscilloscope
(2) Connect the probe to the osilloscope pick-up point
shown in the circuit diagram, and
Measure the terminal voltage.
. Connector: Disconnected
. Ignition switch: ON
Measure the power supply voltage.
. Connector: Disconnected
. Ignition switch: ON
TSB Revision
Standard value
Engine condition
Idling
2,000 rpm
Frequency increases as
Racing
racing rpm increases.
check the wave form.
a s
the multiport fue
injection relay.