Pontiac Fiero 1988 Service Manual page 508

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-53
CODE 45
OXYGEN SENSOR CIRCUIT
(RICH EXHAUST INDICATED)
2.5L " P " SERIES (TBI)
©
« RUN WARM ENGINE (75°C TO 95°C) AT 1200 RPM.
DOES " S C A N " T O O L DISPLAY 0
2
FIXED ABOVE .75 VOLTS (750 mV)?
YES
• 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 C O D E S WERE
STORED, REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
NO
FAULTY ECM.
CLEAR CODES AND CONFIRM " C L O S E D LOOP" OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
2-18-87
* 7 S 3 1 9 2 - 6 E