Pontiac Fiero 1988 Service Manual page 662

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-C1-13
CHART C-1 A
PARK/NEUTRAL SWITCH DIAGNOSIS
(AUTO TRANSAXLE)
2.8L "P" SERIES (PORT)
©
©
• WITH TRANSMISSION IN PARK, " S C A N " SHOULD
INDICATE PARK OR NEUTRAL.
• DOES IT?
YES
• SHIFT TRANSMISSION INTO DRIVE.
• " S C A N " SHOULD DISPLAY A CHANGE TO
INDICATE DRIVE.
• DOES IT?
©
YES
NO TROUBLE
FOUND. P/N
CIRCUIT OK.
NO
X
• DISCONNECT P/N SWITCH.
• THIS SHOULD CAUSE " S C A N "
TO DISPLAY DRIVE RANGE.
• DOES IT?
NO
• DISCONNECT PARK/NEUTRAL SWITCH
CONNECTOR.
• JUMPER TERMINALS " A " TO " B " (CKT 434 TO 450).
• " S C A N " SHOULD INDICATE PARK OR NEUTRAL.
• DOES IT?
Y E S
HZ
FAULTY P/N SWITCH
CONNECTION OR
P/N SWITCH
MISADJUSTED OR
F A U L T Y .
NO
u z
JUMPER TERMINAL " A " (CKT
434) TO ENGINE GROUND.
" S C A N " SHOULD INDICATE
PARK OR NEUTRAL.
DOES IT?
YES
~ l
P/N SWITCH
MISADJUSTED
OR FAULTY.
NO
=|—~\
C K T 4 3 4
SHORTED TO
GROUND OR
FAULTY ECM.
YES
H Z
OPEN
GROUND
CKT 450.
3 _
NO
3ZI
CKT 434 OPEN
OR FAULTY
ECM
CONNECTION
OR ECM.
5-27-87
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