Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 542

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
ISC
servo
control
signal
wave
pattern
MPI –
Troubleshooting
IDLE SPEED CONTROL (ISC) SERVO (STEPPER
Analyzer MOTOR)
Measurement Method
1. Disconnect the ISC servo connector, and connect the
2. Connect the analyzer special patterns pickup to the ISC
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 OFF
to ON (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 electromo-
tive force (Approx. 3
10V)
special tool (test harness: MD998463) in between.
servo-side connector terminal 1 (red clip of special tool),
terminal 3 (blue clip), terminal 4 (black clip) and terminal
6 (yellow clip) respectively.
engine-ECU terminal 4, connection terminal 5, connection
terminal 17, and connection terminal 18 respectively.
Point A
Induced electromotive force
from the motor turning
13B-61
Time