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4A
ISC SYSTEM
TROUBLESHOOTING
Check the condition of the wiring harness and connectors before checking the sensors or switch.
Note
Make the system inspection first. If no problem is found, continue with the next system
inspection of the Troubleshooting Guide. (Refer to pages 4A—8 and 9.)
Possible
cause
\
P a g e \ .
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
4A—40
Solenoid
P/S pres
valve (Idle
Air valve
sure
speed
switch
control)
4A—42
4A—94
4A—42
4
1
2
1
5
2
3
2
7
3
2
2
5
2
5
2
626, MX-6 Revised 10/87
'V
Engine control unit
Electrical
terminal
load con
trol unit
1K
1W
4 A -9 5
4 A- 9 0 4A—91 4A—92
2
3
5
4
3
4
6
5
4
6
5
3
3
3
System
in
spection
2Q
4A—41
3
6
4
1
7
1
7
1
4
1
4
1
4
1
86U04A-059
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Table of Contents
Troubleshooting
