Pontiac Fiero 1988 Service Manual page 596

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-A-13
CHART A-3
(Pagel of 2)
ENGINE CRANKS BUT WON'T RUN
2.8L " P " SERIES (PORT)
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• FUEL QUANTITY OK.
• IGNITION " O N " . IF S.E.S. LIGHT IS " O F F " , SEE CHART A-1.
• INSTALL " S C A N " T O O L IF "NO ALDL", SEE CHART A-2.
CHECK THE FOLLOWING:
• TPS - IF OVER 2.5 VOLTS AT CLOSED THROTTLE, SEE CODE 21.
IS RPM IDICATED DURING CRANKING?
CHART A-3
(Pagel of 2)
ENGINE CRANKS BUT WON'T RUN
2.8L " P " SERIES (PORT)
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• FUEL QUANTITY OK.
• IGNITION " O N " . IF S.E.S. LIGHT IS " O F F " , SEE CHART A-1.
• INSTALL " S C A N " T O O L IF "NO ALDL", SEE CHART A-2.
CHECK THE FOLLOWING:
• TPS - IF OVER 2.5 VOLTS AT CLOSED THROTTLE, SEE CODE 21.
IS RPM IDICATED DURING CRANKING?
YES
m
USING A ST-125 (SPARK CHECKER), J-26792
OR EQUIVALENT, CHECK FOR SPARK WHILE
CRANKING (CHECK TWO WIRES)
IS SPARK PRESENT?
YES
NO
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• CKECK EACH BANK OF
INJECTORS AS FOLLOWS
• DISONNECT ONE INJECTOR
• CONNECT TEST LIGHT
J-34730-2 OR EQUIVALENT
TO INJECTOR HARNESS
CONNECTOR TERMINALS
• CHECK FOR BLINKING LIGHT
WHILE CRANKING
• RECONNECT INJECTOR
• REPEAT TEST ON ANOTHER
INJECTOR ON THE SAME
BANK
• LIGHT SHOULD BLINK ON
BOTH
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j BASIC HEI
| PROBLEM. REFER
! TO CHART C-4
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BLINKING LIGHT, BOTH
I
• IGNITION " O F F " .
• INSTALL FUEL PRESSURE G A G E AND NOTE
PRESSURE AFTER IGNITION " O N " .
SHOULD BE 32-47 psi (220-325 kPa)
OK
Z E
SEE DIAGNOSTIC AIDS ON FACING PAGE FOR
ADDITIONAL ITEMS TO CHECK. IF ALL OK, FUEL
INJECTION SYSTEM OK.
REFER TO "HARD START "IN SECTION " B " .
NO
m
USING A ST-125 (SPARK CHECKER), J-26792
OR EQUIVALENT, CHECK FOR SPARK WHILE
CRANKING (CHECK TWO WIRES)
IS SPARK PRESENT (AT LEAST ONE)?
YES
1
IGNITION " O F F " .
DISCONNECT DISTRIBUTOR
4-WAY CONNECTOR.
IGNITION " O N " .
MOMENTARILY TOUCH
HARNESS CONN. TERMINAL
(CKT 430) WITH A TEST LIGHT
TO 12 VOLTS.
" S C A N " SHOULD INDICATE
RPM WHEN TEST IS
PERFORMED.
DOES IT?
©:
YES
• FAULTY CONNECTION OR
IGNITION MODULE.
NO BLINKING LIGHT, ONE OR BOTH
r - L
| SEE CHART A-3 J
i
(2 OF 2)
i
NOT OK
SEE
"1
i
i CHART A-7 !
L „ _
J
NO
m
CHECK FOR
BATT. V O L T A G E
TO IGN. S Y S T E M .
IF OK, THERE I S A
BASIC HEI PROB-
LEM. R E F E R T O
CHART C-4.
NO
Z E
CKT 430 OPEN,
SHORTED TO
GROUND, OR
FAULTY ECM.
7-13-87
8 S 4 6 4 6 - 6 E