Pontiac Fiero 1988 Service Manual page 528

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-C1-11
CHART C-1A
PARK/NEUTRAL SWITCH DIAGNOSIS
2.5L "P" SERIES (TBI)
o
©
• WITH TRANSMISSION IN PARK, " S C A N " SHOULD
INDICATE PARK OR NEUTRAL.
9
DOES IT?
YES
• SHIFT TRANSMISSION INTO DRIVE.
• " S C A N " SHOULD DISPLAY A CHANGE TO
INDICATE DRIVE.
• DOES IT?
©
NO
H Z
• DISCONNECT PARK/NEUTRAL SWITCH
CONNECTOR.
9 JUMPER TERMINALS " A " TO " B " (CKT 434 TO 450).
© " S C A N " SHOULD INDICATE PARK OR NEUTRAL.
• DOES IT?
YES
NO
NO TROUBLE
FOUND. P/N
CIRCUIT OK.
• DISCONNECT P/N SWITCH.
« THIS SHOULD CAUSE "SCAN"
TO DISPLAY DRIVE RANGE.
© DOES IT?
YES
Z E Z
P/N SWITCH
R E A D J U S T E D
Oft FAULTY.
3 _
NO
H Z
JUMPER TERMINAL " A " (CKT
434) TO ENGINE GROUND.
" S C A N " SHOULD INDICATE
PARK OR NEUTRAL.
DOES IT?
YES
P/N SWITCH
MISADJUSTED
OR FAULTY.
NO
CKT 434
SHORTED TO
GROUND OR
FAULTY ECM.
YES
H Z
OPEN
GROUND
CKT 450.
NO
H Z Z
CKT 434
OPEN OR
FAULTY ECM.
2-17-87
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