Mitsubishi Galant. Manual - part 322
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-513
Measurement Method
1. Disconnect the connector, and connect test harness special
tool, (MB991348), in between. (All terminals should be
connected.)
2. Connect the oscilloscope probe to ignition coil connector
terminal 3.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal 11.
Standard Wave Pattern
Wave Pattern Observation Points
Point: Condition of wave pattern build-up section and maximum
voltage (Refer to abnormal wave pattern examples 1 and 2.
Observation conditions
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Approximately 1,200 r/min
AK000067
1 2 3 4 5 6 7
OSCILLOSCOPE
DISTRIBUTOR
CONNECTOR
OSCILLO
SCOPE
PLOBE
AB
AK000069
CRANKSHAFT
POSITION
SENSOR OUTPUT
WAVE PATTERN
(REFERENCE)
IGNITION POWER
TRANSISTOR
CONTROL SIGNAL
WAVE PATTERN
POINT:
WAVE BUILD-UP
SECTION
Standard wave pattern
θ
θ
: SPARK ADVANCE ANGLE
ON
DWELL SECTION
TIME
OFF
T
T : CRANKSHAFT ANGLE (120˚)
COMPRESSION
TOP DEAD CENTER
0
2
4
6
0
2
4
6
(V)