Mitsubishi Galant. Manual - part 187
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-429
Example 2
•
Cause of problem
Open circuit in the line between the idle air control motor
and the PCM.
•
Wave pattern characteristics
Current is not supplied to the motor coil on the open circuit
side. (Voltage does not drop to 0 volt.) Furthermore, the
induced electromotive force wave pattern at the normal side
is slightly different from the normal wave pattern.
IGNITION COIL AND IGNITION POWER
TRANSISTOR
Required Special Tool:
MB991348: Test Harness Set
Measurement Method
1. Disconnect the ignition coil 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)
Connect the oscilloscope probe to PCM terminals 11 (for
number 1
−
number 4), terminal 12 (for number 2
−
number
3) respectively.
Standard Wave Pattern
AKX01609
OPEN
CIRCUIT
SIDE
NORMAL
SIDE
AB
Observation conditions
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Approximately 1,200 r/min
AK000066 AB
OSCILLOSCOPE
OSCILLO
SCOPE
PLOBE
1 2 3