Pontiac Fiero 1988 Service Manual page 506

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-51
CODE 44
OXYGEN SENSOR CIRCUIT
(LEAN EXHAUST INDICATED)
2.5L "P" SERIES (TBI)
©
• RUN W A R M ENGINE (75°C TO 95°C) AT 1200 RPM.
• DOES " S C A N " INDICATE 0
2
VOLTAGE FIXED B E L O W .35 VOLTS (350 mV)?
YES
NO
• DISCONNECT 0
2
SENSOR.
• WITH ENGINE IDLING " S C A N " SHOULD DISPLAY 0
2
BETWEEN .35 VOLTS AND .55 V O L T S (350 mV AND
550 mV) .
DOES IT?
CODE 44 IS INTERMITTENT.
IF NO ADDITIONAL C O D E S WERE
STORED. REFER TO "DIAGNOSTIC
AIDS" ON FACING PAGE.
Y E S
REFER TO "DIAGNOSTIC
AIDS" ON FACING P A G E -
NO
CKT 412 SHORTED TO
GROUND OR FAULTY ECM.
2-24-87
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT. *
7 S 3 1 9 1
_
6 g