Pontiac Fiero 1988 Service Manual page 638

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A-5*
CODE 45
OXYGEN SENSOR CIRCUIT
(RICH EXHAUST INDICATED)
2.8L "P" SERIES (PORT)
©
• RUN W A R M ENGINE (75°C TO 95°C) AT 1200 RPM.
© DOES " S C A N " T O O L DISPLAY 0
2
SENSOR FIXED ABOVE .75 VOLTS
(750 mV)?
YES
x
DISCONNECT 0
2
SENSOR AND JUMPER
HARNESS CKT 412 TO GROUND.
" S C A N " SHOULD DISPLAY 0
2
BELOW
.35 VOLTS (350 mV).
DOES IT?
NO
I
CODE 45 IS INTERMITTENT.
IF NO ADDITIONAL CODES WERE
STORED, REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
YES
H _
REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
NO
r:
FAULTY ECM.
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
5-27-87
* 7 S 3 1 9 2 - 6 E