Pontiac Fiero 1988 Service Manual page 490

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-35
CODE 22
THROTTLE POSITION SENSOR (TPS) CIRCUIT
(SIGNAL VOLTAGE LOW)
2.5L "?" SERIES (TBI)
©
©
©
• THROTTLE CLOSED
• DOES "SCAN" DISPLAY TPS .2V (200MV) OR BELOW?
YES
i
• DISCONNECT SENSOR.
• JUMPER CIRCUITS 416 &417 TOGETHER.
• "SCAN" SHOULD DISPLAY TPS OVER 4.0 V.
DOES IT?
NO
• PROBE CIRCUIT 417 WITH A TEST LIGHT
CONNECTED TO 12 VOLTS.
• "SCAN" TOOL SHOULD DISPLAY TPS OVER
4.0 V.
DOES IT?
YES
NO
CODE 22 IS INTERMITTENT. IF NO
ADDITIONAL CODES WERE STORED,
REFER TO DIAGNOSTIC AIDS ON
FACING PAGE.
YES
REPLACE SENSOR
NO
©
CIRCUIT 416 OPEN, SHORTED TO
GROUND, FAULTY CONNECTION
OR FAULTY ECM.
CIRCUIT 417 OPEN,
SHORTED TO GROUND,
FAULTY CONNECTION
OR FAULTY ECM.
CLEAR CODES AND CONFIRM "CLOSED LOOP" OPERATION AND NO "SERVICE ENGINE SOON" LIGHT.
10-30-86
*7S3260-6E