Circuit Diagram; Code No.01 Igf-Signal - Mazda MX-5 1990 Workshop Manual

SELF-DIAGNOSIS FUNCTION
F
Troubleshooting
If a malfunction code number is shown on the SST, check for the cause by using the chart related to the
code number shown.
CODE NO.01 IGf-SIGNAL
STEP INSPECTION
1
Are there any poor connections at ignition coil connec- Yes
tors and igniter connectors?
2 Does tachometer operates?
3 Is resistance of ignition coil OK?
Resistance: Primary 0.78-0.940
Secondary 11.2-15.2 kG
4 Is there continuity between ignition coil and igniter?
Ignition coil Igniter
A (W)
A (W)
B (Y)
H (Y)
5 Is ignition coil terminal wire (L) voltage OK?
(Refer to page G-21)
6 Is igniter terminal-wire (L) voltage OK?
(Refer to page G-22)
7
Is there continuity between igniter and ground?
8 Check igniter (Refer to page G-22)
Circuit Diagram
TO
FROM IGNITION TACHOMETER
SWITCH
L (F)
DIAGNOSIS
CONNECTOR
TERMINAL (lG)
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
CONDENSER
ACTION
Repair or replace connector
Go to next step
Go to next step
Check for open circuit in wiring from igniter to
ECU terminal 21
Go to next step
Replace ignition coil
(Refer to page G-21)
Go to next step
Check for open circuit in wiring from ignition coil
to igniter
Go to next step
Check for open circuit in wiring from ignition coil
to ignition switch
Go to next step
Check for open circuit in wiring from igniter to
ignition switch
Go to next step
Check for open circuit in wiring from igniter to
ground
Replace ECU (Refer to page F-127)
Replace igniter (Refer to page G-22)
BRIY (F)
B/W (F)
BR (F)
B (F)
ECU
B (F)
05UOFX·076
05UOFX-077
F-81