Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 541

13B-60
Standard Wave Pattern
Observation conditions
Function
Pattern height
Variable knob
Pattern selector
Engine r/min
Standard wave pattern
Wave Pattern Observation Points
Point A: Height of solenoid back electromotive force
Contrast with standard wave pattern
Solenoid coil back electromotive force is low or doesn't
appear at all.
Point B: Injector drive time
---
When idling
––
When racing
MPI –
(V)
Point A
50
Point B
Injector drive time
0
Drive signal: ON
Troubleshooting
Special patterns
Variable
Adjust while viewing the wave pattern
Display
Idle speed
Solenoid back electromotive force
(Approx. 7 10 V)
Power voltage
Drive signal: OFF
Probable cause
Short in the injector solenoid
The injector drive time will be synchronized with the MUT-II
tester display.
When the engine is suddenly raced, the drive time will
be greatly extended at first, but the drive time will soon
match the engine speed.
Time