Pontiac Fiero 1988 Service Manual page 618

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A-35
CODE 22
THROTTLE POSITION SENSOR (TPS) CIRCUIT
(SIGNAL VOLTAGE LOW)
2.8L "P" SERIES (PORT)
Of
« THROTTLE CLOSED
• DOES " S C A N " DISPLAY TPS .2V (200 mV) OR BELOW?
©
YES
i
• DISCONNECT SENSOR.
•
JUMPER CKTS 416 8e 417 TOGETHER.
• " S C A N " SHOULD DISPLAY TPS OVER 4.0 V.
DOES IT?
NO
NO
CODE 22 IS IN rERMITTENT. IF NO
ADDITIONAL CODES WERE STORED,
REFER TO "DIAGNOSTIC AIDS" ON
FACING PAGE.
YES
©
• PROBE C K T 4 1 7 WITH A TEST LIGHT CONNECTED
TO 12 VOLTS.
• " S C A N " TOOL SHOULD DISPLAY TPS OVER 4.0 V.
DOES IT?
YES
REPLACE SENSOR.
NO
©
CKT 416 OPEN, SHORTED TO
GROUND, FAULTY CONNECTION
OR FAULTY E C M .
C K T 4 1 7 OPEN,
SHORTED TO GROUND,
FAULTY CONNECTION
OR FAULTY ECM.
CLEAR CODES AND CONFIRM " C L O S E D LOOP" OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
6-18-87
* 7 S 3 2 6 0 - 6 E