Pontiac Fiero 1988 Service Manual page 610

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A-27
CODE 13
O X Y G E N SENSOR CIRCUIT
(OPEN CIRCUIT)
2.8L " P " SERIES (PORT)
©
©
ENGINE AT NORMAL OPERATING TEMPERATURE (ABOVE 80°C).
• RUN ENGINE ABOVE 1200 RPM FOR TWO MINUTES.
DOES " S C A N " INDICATE "CLOSED L O O P " ?
NO
i
• DISCONNECT 0
2
SENSOR.
© JUMPER HARNESS C K T 4 1 2 TO GROUND.
• " S C A N " SHOULD DISPLAY 0
2
VOLTAGE BELOW .2
VOLTS (200 mV) WITH ENGINE RUNNING.
DOES IT?
NO
©
• IGNITION " O N " . ENGINE " O F F " .
• CHECK VOLTAGE OF CKT 412 (ECM SIDE) AT 0
2
SENSOR HARNESS CONNECTOR USING A DVM.
IT SHOULD BE . 3 . 6 VOLTS (300 - 600 mV).
. 3 . 6 VOLTS
(300 - 600 mV)
i
OVER .6 VOLT
(600 mV)
FAULTY ECM
OPEN C K T 4 1 3 ,
FAULTY CONNECTION
OR FAULTY ECM.
l
YES
r
CODE 13 IS INTERMITTENT. IF NO
ADDITIONAL CODES WERE STORED,
REFER TO "DIAGNOSTIC AIDS" ON
FACING PAGE.
1
YES
X
FAULTY 0
2
SENSOR
CONNECTION OR SENSOR.
LESS THAN .3
VOLT (300 mV)
OPEN CKT 412, FAULTY
ECM CONNECTION OR ECM.
6-23-87
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
# ? $ 3 0 5 4
.
6 E