Mazda 1990 323 Workshop Manual Supplement page 227

TROUBLESHOOTING GUIDE
K2
iii
11
12
INSPECTION
ACTION
1
Check if throttle sensor is
OK
w page *F-143
Iisconnect 20-pin connector of EC-AT control
unit
Check if resistance between 2J terminal and 2L
.erminals of EC-AT control unit is OK
Resistance: 200-4OOQ
Check if resistance of pulse generator is OK
w page K2-142
Resistance: 200-4OOQ
Connect oscilloscope ground terminal to 2L ter-
minal of EC-AT control unit, and oscilloscope in-
put terminal to 2J terminal of EC-AT control unit
Check if pulse display is OK
\
L I
, : : :-
/
I \
l-y
I
K-
No Adjust or replace throttle sensor
Yes
Go to Step 12
No
Go to next step
Yes
No
Yes
No
Check for open or short circuit of wiring
and poor connection at connectors
3 If OK, go to next step
3 If not OK, repair or replace
w page *F-143
Check for poor connection at connec-
tors and go to next step
Replace pulse generator
Go to next step
Very low voltage:
Replace pulse generator
Noise in wave from:
Check for improper grounding of shield-
wiring or replace pulse generator
* Refer to 1990 323 Workshop Manual (1195-10.89E).
K2-51