Mazda MX-5 1990 Workshop Manual page 205

TROUBLESHOOTING GUIDE
F
STEP
INSPECTION
5
Check for correct ignition timing at idle
c::r
page F-75
Ignition timing: 10
0
±
1
0
BTDC
CONNECT TERMINALS
6 Check if spark plugs are OK
WEAR AND CARBON BUILDUP
PLUG GAP
1.0-1.1mm
(0.039-0.043
in)
r.rN~~"-
BURNS
DAMAGE AND
DETERIORATION
DAMAGE
7 Check if resistance of high-tension leads are OK
Resistance: 16 kn per 1 m (3.28
tt)
8 Check if resistance of ignition coil is OK
c:::r
page G-21
Resistance (at 20°C [69°F]):
CD
Primary coil ........ 0.78-0.940
®
Secondary coil .... 11.2-15.2 kO
Yes
ACTION
Check if ignition timing advances when
accelerating
c::>
If advances, go to next step
¢
If no advance, check ECU terminal
voltages
c::r
page
F-127
No Adjust
c::7
page F-75
Yes Go to next step
No Repair, clean, or replace cr page G-20
Yes Go to next step
No Replace
c:::r
page G-22
Yes Go to next step
No Replace cr
page
G-21
F-61