Mazda 1990 323 Workshop Manual Supplement page 263

TROUBLESHOOTING GUIDE
K2
18
19
20
INSPECTION
T
Check if resistance of pulse generator is OK
w page K2-142
Resistance: 200--4OOfl
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
Yes
No
Yes
No
-I.-
ACTION
Check for poor connection at connec-
tors and go to next step
Replace pulse generator
Check for open or short circuit of wiring
and poor connection at connectors
* If OK, go to next step
* If not OK, repair wiring
Very low voltage:
Replace pulse generator
Noise in wave form:
Check for improper grounding of shield-
wiring or replace pulse generator
Try known good EC-AT control unit
K2-87