Mazda 121 Workshop Manual page 230

F
SELF-DIAGNOSIS FUNCTION
ffiYGEN
sENsoB - tNAcrtvATtot{)
STEP
t]{sPECTlOt{
ACTION
ls there a poor connection n orygen sensor
Repair or replace wing
2
ls oxygen sensor odpul vollage cotrecr?
F Page F-123
Replace oxygon sensor
3
ls there continuity betlveen oxygen sensor and
EclJ termlnal 2N?
ls ECU terminal 2N voltage correcl?
F Page F-1lE
Check ior shod circuit in wiring lrom oxvgen sensor to
ECU
5
ls sensitivity of oxygen sensor correcp
t7 Page F-123
a a d r o F a | | s
o a o e F - t 1 2
Try known good otygen sensor and
ch;ck It co;dition improves
.? ptge F-124
Circuit Diagram
F-7 4