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TROUBLESHOOTING
Check the condition of the wiring harness and connectors before checking the sensors or switches.
Note
Make the system inspection first. If no problem is found, continue with the next system
inspection of the Troubleshooting Guide. (Refer to pages 4B—8 and 9.)
.
Possible
cause
Page
x.
Symptom
While warming up
Engine
stalls
After warming up
While warming up
Rough
idle
After warming up
High idle speed after warming up
Runs rough on deceleration
Afterburn in exhaust system
Fails emission test
Solenoid
P/S pres
valve (Idle
Air valve
sure
speed
switch
control)
4B-49
4B-49
4B-109
4
1
1
2
5
2
3
2
7
3
2
2
5
2
5
2
626, MX-6 Revised 10/87
ISC SYSTEM
Engine control unit
Electrical
terminal
load con
trol unit
1K
1W
4B-105 4B-106 4B-107
4B-110
2
4
3
5
3
4
6
5
4
6
5
3
3
3
4B
System
in
spection
2Q
4B-48
3
6
4
1
7
1
7
1
4
1
4
1
4
1
86U04A-035
4B—47
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Table of Contents
Troubleshooting
