Mazda 323 1988 Workshop Manual page 292

4B
TROUBLESHOOTING WITH SST
No. 15 Code display illumination (Oxygen Sensor)
Is oxygen sensor output voltage OK?
(Refer to page 48-83)
I
Replace oxygen sensor.
Is sensitivity of oxygen sensor OK?
(Refer to page 46-83)
Replace oxygen .sensor
YES
Perform after-repair procedure
No. 17 Code display illumination (Feedback System)
Does monitor lamp of S
luminate at idle?
PC: Air leak in vacuum hoses or emission compo-
nents. Contaminated oxygen sensor
Clogged fuel jet(s)
YES
t
Are spark plugs clean?
Clean or replace spark plugs
YES
Is oxygen sensor output VOI
(Refer to page 48-83)
PC: oxygen sensor faulty
YES
Is 1A terminal voltage of en
(Refer to page 48-77)
._,.
PC: Open or short circuit in wiring harness from oxy-
gen sensor connector to engine control unit
YES
Perform after-repair procedure
48-20