Pontiac Fiero 1988 Service Manual page 604

D R I V E A B I L I T Y
AND EMISSIONS - FUEL INJECTION (PORT)
6 E 3 - A - 2 1
r ' ' " — ~ * • - ' • •
1
! NOTICE- EFI SYSTEM UNDER PRESSURE. TO AVOID FUEL SPILLAGE, REFER
I
TO FIELD SERVICE PROCEDURES FOR TESTING OR MAKING
i REPAIRS REQUIRING DISASSEMBL Y OF FUEL LINES OR FITTINGS.
; FROM .
; CHART A-7 I
; (PAGE 2 OF 4) I
LIGHT " O N "
©
• CONNECT TEST LIGHT BETWEEN
TERMINAL " A " AND " C " .
• IGNITION " O F F " FOR TEN SECONDS.
• NOTE TEST LIGHT WITHIN 2 SECONDS
AFTER IGNITION " O N " .
LIGHT "ON"
©
©
REPLACE RELAY. IF ORIGINAL PROBLEM WAS
"CRANKS BUT WILL NOT RUN", MAKE
FOLLOWING ADDITIONAL CHECKS.
* ENGINE RUNNING AT NORMAL
OPERATING TEMPERATURE.
® DISCONNECT FUEL PUMP RELAY.
ENGINE SHOULD CONTINUE TO RUN.
©
OK
RECONNECT FUEL PUMP
RELAY.
IGNITION " O F F " .
PROBE FUEL PUMP TEST
TERMINAL " G " WITH A TEST
LIGHT TO GROUND.
NOT OK
~1
. J
FAULTY OIL
PRESSURE
SWITCH.
NO LIGHT
»
LIGHT
NO TROUBLE FOUND.
CHAIT A-7
(Page 3 of 4)
FUEL SYSTEM DIAGNOSIS
2.8L "P" SERIES (PORT)
LIGHT " O F F "
zx :::::
REPAIR OPEN GROUND CKT 450.
LIGHT " O F F "
I
DISCONNECT ECM A-B CONNECTOR AND CHECK
FOR OPEN OR SHORT TO GROUND IN CKT 465.
C K T 4 6 5 OK
I
CKT 465 NOT OK
CHECK RESISTANCE
ACROSS PUMP RELAY PINS
OPPOSITE HARNESS CONN.
TERMS. " A " AND " C " ,
SHOULD MEASURE 20
OHMS OR MORE.
I
LEPAIR CKT. 465. IF CKT WAS
SHORTED TO GROUND. RECHECK
FOR "LIGHT O N " BETWEEN
HARNESS CONNECTOR TERMINAL
" A " AND GROUND WITHIN 2
SECONDS AFTER IGNITION " O N " .
OK
RETEST WITH
ORIGINAL
ECM, REPLACE
ECM IF
NECESSARY.
REFER TO
DIAGNOSTIC
AIDS ON
FACING PAGE.
FAULTY OIL
PRESSURE SWITCH.
NOT OK
NO LIGHT
REPLACE RELAY
AND RETEST
WITH ORIGINAL
ECM. REPLACE
ECM IF
NECESSARY.
REFER TO
DIAGNOSTIC
AIDS ON FACING
PAGE.
1 .
FAULTY ECM
CONNECTOR
TERMINAL
OR ECM.
LIGHT
IZ
RECONNECT
RELAY.
7-7-87
CLEAR CODES AND CONFIRM " C L O S E D LOOP " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT. * 5 S
1904-6E