Pontiac Fiero 1988 Service Manual page 636

DRIVEABILITY A N D EMISSIONS - FUEL INJECTION (PORT) 6E3-A-53
CODE 44
OXYGEN SENSOR CIRCUIT
(LEAN EXHAUST INDICATED)
2.8L "P" SERIES (PORT)
• RUN WARM ENGINE (75°C TO 95°C) AT 1200 RPM.
• DOES " S C A N " INDICATE 0
2
SENSOR VOLTAGE FIXED BELOW 35 VOLTS (350 mV)?
Y E S
• DISCONNECT 0
2
SENSOR.
• WITH ENGINE IDLING " S C A N " SHOULD DISPLAY 0
2
SENSOR BETWEEN .35 VOLTS AND .55 VOLTS (350
mV AND 550 mV).
DOES IT?
YES
REFER TO "DIAGNOSTIC
A I D S " ON FACING PAGE..
NO
CODE 44 IS INTERMITTENT.
IF NO ADDITIONAL CODES WERE
STORED, REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
NO
CKT 412 SHORTED TO
GROUND OR 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
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