Pontiac Fiero 1988 Service Manual page 566

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-C8-5
TOOL, CHECK THE FOLLOWING AND CORRECT IF USING A " S C A N '
NECESSARY:
• COOLANT TEMPERATURE SHOULD BE ABOVE 65°C.
• TPS - BE SURE TPS SIGNAL IS NOT ERRATIC.
© VSS - SHOULD INDICATE VSS WITH WHEELS TURNING.
• CODES - IF 24 IS PRESENT, SEE CODE CHART 24.
©
• PERFORM MECHANICAL CHECKS, SUCH AS LINKAGE, OIL LEVEL,
ETC., BEFORE USING THIS CHART.
• CONNECT TEST LIGHT FROM TCC TEST POINT, ALDL TERM " F " AND
GROUND.
• RAISE DRIVE W H E E L S .
• START AND IDLE ENGINE IN DRIVE. DO NOT DEPRESS BRAKE
PEDAL.
• "NOTICE: " DO NOT PERFORM THIS TEST WITHOUT SUPPORTING
THE LOWER CONTROL ARMS SO THA T THE DRIVE AXLES ARE IN A
NORMAL HORIZONTAL POSITION. RUNNING THE VEHICLE IN GEAR
WITH THE WHEELS HANGING DOWN AT FULL TRA VEL MA Y
DAMAGE THE DRIVE AXLES.
• NOTE LIGHT.
©
LIGHT " O F F "
T
• INCREASE SPEED SLOWLY UNTIL TRANS. SHIFTS INTO
3RD GEAR. TO CLOSE 3RD GEAR APPLY SWITCH.
• NOTE TEST LIGHT.
3
LIGHT "ON"
TEST LIGHT SHOULD
GO OUT AS BRAKE
PEDAL IS DEPRESSED.
DOES IT?
YES
NO
CHART G 8 A
125C TRANSMISSION
CONVERTER CLUTCH (TCC)
(ELECTRICAL DIAGNOSIS)
2.5L "P" SERIES (TBI)
LIGHT " O N "
Z Z I M : : : : ; : ; : =
FAULTY TRANSMISSION THIRD
GEAR APPLY SWITCH.
LIGHT " O F F "
CHECK FOR BLOWN FUSE. IF OK, DISCONNECT
CONNECTOR AT TRANS.
CONNECT TEST LIGHT FROM HARNESS CONNECTOR
" A " TO "D" .
IGNITION " O N " , ENGINE STOPPED.
LIGHT " O F F " LIGHT "ON"
©
IGNITION " O N " . ENGINE
STOPPED.
INSTEAD OF GROUND.
CONNECT TEST LIGHT TO
12 VOLTS AND PROBE
ALDL TERMINAL " F " .
GROUND DIAGNOSTIC
TERMINAL AND NOTE
LIGHT.
LIGHT "ON"
CHECK FOR
CORRECT PROM IF
OK, TCC
ELECTRICAL
CONTROL IS OK.
FAULTY BRAKE
SWITCH OR
ADJUSTMENT.
LIGHT " O F F "
CHECK FOR OPEN CKT
422 FROM ALDL TO
ECM CONNECTOR
TERMINAL. IF CKT 422
IS OK. IT IS A FAULTY
ECM.
• CONNECT A TEST LIGHT
FROM TERM " A " TO
GROUND.
LIGHT "ON"
GROUND TCC TEST POINT
AND AGAIN CONNECT TEST
LIGHT BETWEEN HARNESS
CONNECTOR TERMINALS " A "
AND"D".
LIGHT "ON"
FAULTY:
• TRANS. TCC CONN.
• TCC SOLENOID.
• THIRD GEAR APPLY SWITCH
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
CHECK FOR SHORT TO
GROUND IN CKT 422. IF
NOT GROUNDED.
REPLACE ECM.
LIGHT " O F F "
I
REPAIR OPEN IN
T C C B R A K E
SWITCH CIRCUIT
OR ADJ. SWITCH.
LIGHT " O F F "
REPAIR OPEN IN WIRE
FROM TRANS. TO ALDL
TEST POINT. TERMINAL
" F " .
* 7S 3394-6E
3-25-87