Mazda MX-5 1990 Workshop Manual page 193

TROUBLESHOOTING GUIDE
STEP
5
INSPECTION
Disconnect ISC valve connector at idle and
check if "clicking" is heard from
ISC
valve
6 Check for correct idle speed
cr
page F-76
Idlle speed: 850
±
50 rpm
GND TI;N
bB'UJ
CONNECT TERMINALS
7 Try known good ECU and check if condition im-
proves
L7'
page F-127
Yes Go to next step
No Replace ISC valve
Yes Go to next step
No Adjust
F
ACTION
c::::r
page F-99
L7'
page F-76
05UOFX-036
F-49