Mitsubishi Eclipse 1990 Service Manual page 638

Standard Wave Pattern
Observation conditions
Function Special patterns
Pattern height High
Display
Pattern selector
Engine condition When the engine coolant temperature is
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 (approx. 1 minute).
Standard wave pattern
The wave pattern
appears for an
instant, but soon
disappears.
30
10
Stepper motor
control signal
wave pattern
STEPPER MOTOR
Analyzer
Measurement method
1. Disconnect the stepper motor connector, and connect
the special tool (test harness:
2. Connect the analyzer special patterns pickup to the step-
per motor-side connector terminal (red clip on the special
tool), terminal 3 (blue clip), terminal 4 (black clip) and
terminal 6 (yellow clip) respectively.
Alternate method (Test
1. Connect the analyzer special patterns pickup to ECM
terminal 4, connection terminal 5, connection terminal
17, and' connection terminal 18 respectively.
Coil reverse voltage
(Approx. 3
Revision
Engine (Turbo)>
not available) .
or below,
(Point]
induced voltage from the
turning
in between.
.
. .
Time