Pontiac Fiero 1988 Service Manual page 702

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-C8-5
USING A "SCAN" TOOL, CHECK THE FOLLOWING AMD
CORRECT IF 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.
m
CONNECT TEST LIGHT FROM TCC TEST POINT, ALDL TERM " F " AND
GROUND.
• RAISE DRIVE WHEELS.
® 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 TRAVEL MAY
DAMAGE THE DRIVE AXLES.
• NOTE LIGHT.
CHART C-8A
125C
TRANSMISSION/TRANSAXLE
CONVERTER CLUTCH
(ELECTRICAL DIAGNOSIS)
2.8L " ? " SERIES (PORT)
LIGHT " O F F "
©
® INCREASE SPEED SLOWLY UNTIL
TRANS. SHIFTS INTO 3RD GEAR. TO
CLOSE 3RD GEAR APPLY SWITCH.
• NOTE TEST LIGHT.
LIGHT " O N "
TEST LIGHT SHOULD
GO OUT AS BRAKE
PEDAL IS DEPRESSED.
DOES IT?
©
YES
H Z
IGNITION ON. ENGINE
STOPPED.
INSTEAD OF GROUND.
CONNECT TEST LIGHT TO
12 VOLTS AND PROBE
ALDL TERMINAL " F " .
GROUND DIAGNOSTIC
TERMINAL AND NOTE
LIGHT.
NO
Z 3 Z
FAULTY BRAKE
SWITCH OR
ADJUSTMENT.
LIGHT " O N "
CHECK FOR
CORRECT PROM IF
OK, TCC
ELECTRICAL
CONTROL IS OK.
LIGHT " O F F "
CHECK FOR OPEN CKT
422 FROM ALDL TO
ECM CONNECTOR
TERMINAL. IF OK, ST IS
FAULTY ECM. REFER
TO ECM QUAD DRIVER
CHECK (CHART C-1).
LIGHT "ON"
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 "
1
LIGHT "ON"
CONNECT A
TEST LIGHT
FROM TERM "A"
TO GROUND.
CHECK FOR SHORT TO
GROUND IN CKT 422. IF NOT
GROUNDED, FAULTY ECM.
REFER TO ECM QUAD DRIVER
CHECK (CHART C-1).
LIGHT " O N "
GROUND TCC TEST POINT
AND AGAIN CONNECT TEST
LIGHT BETWEEN HARNESS
CON-NECTOR TERMS " A "
AND"D".
LIGHT "ON"
z n z z z :
LIGHT " O F F "
zi
REPAIR OPEN IN
TCC BRAKE
SWITCH CIRCUIT
OR ADJ. SWITCH.
LIGHT " O F F "
FAULTY:
* TRANS. TCC CONN.
® TCC SOLENOID.
• THIRD GEAR APPLY
SWITCH.
REPAIR OPEN IN WIRE
FROM TRANS. TO ALDL
TEST POINT. TERM " F " .
CLEAR CODES AND CONFIRM "CLOSED L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
* 7 S 3 5 1 7 - 6 E
7-7-87