Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1258

Special
patterns
pickup
Standard Wave Pattern
Observation conditions
Function
Pattern height
Pattern selector
Engine condition
Standard wave pattern
(V)
The wave pattern
appears for an
instant, but soon
30
disappears.
20
10
Stepper
motor
control
signal
wave
pattern
MPI -
Troubleshooting
IDLE SPEED CONTROL SERVO (STEPPER MOTOR)
Analyzer
Measurement Method
1. Disconnect the idle speed control servo connector, and
2. Connect the analyzer special patterns pickup to the idle
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
Special patterns
High
Display
When the engine coolant temperature is 20_C or below, turn the ignition switch from "LOCK"
(OFF) position to "ON" position (without starting the engine).
While the engine is idling, turn the A/C switch to ON.
Immediately after starting the warm engine
Point B
Coil reverse electromotive
force (Approx. 3 × 10 V)
connect the special tool (test harness: MB991709) in
between.
speed control servo-side connector terminal No. 1,
terminal No. 3, terminal No. 4 and terminal No. 6
respectively.
engine-ECU terminal No. 4, connection terminal No. 5,
connection terminal No. 17, and connection terminal No.
18 respectively.
Point A
Induced electromotive force
from the motor turning
13A-121
Time