Pontiac Fiero 1988 Service Manual page 474

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-19
CHART A-3
(Page 3 of 3 )
ENGINE CRANKS BUT WON'T RUN
2.5L "P" SERIES (TBI)
FROM
A-3
PAGE 1
NO LIGHT
• IGNITION "ON", ENGINE STOPPED.
• PROBE EACH INJECTOR HARNESS
CONNECTOR TERMINAL WITH A
TEST LIGHT TO GROUND.
LIGHT "ON"
ONE TERMINAL.
LIGHT "OFF"
BOTH TERMINALS.
LIGHT "ON"
BOTH TERMINALS.
• IGNITION "OFF".
• RECONNECT INJECTOR.
• DISCONNECT WHITE
ECM CON ECTOR.
• IGN "ON".
• PROBE CONNECTOR
TERM. W1 WITH A TEST
LIGHT TO GROUND.
0
REPAIR OPEN
IGNITION
CKT 439.
REPAIR SHORT TO
VOLTAGE CKT 467.
LIGHT "ON"
I
LIGHT "OFF-
FAULTY ECM
CONNECTOR W1, OR
FAULTY ECM
FAULTY CONNECTION
OR OPEN CIRCUIT 467.
STEADY LIGHT
I
CHECK FOR SHORT TO
GROUND INJECTOR
CIRCUIT 467.
IF CIRCUIT 467 IS NOT
GROUNDED, CHECK RESISTANCE
ACROSS TERMINALS INJECTOR,
SHOULD BE OVER 1.2 OHMS.
OK NOT OK
FAULTY
ECM.
FAULTY INJECTOR
AND ECM.
CLEAR CODES AND CONFIRM "CLOSED LOOP " OPERATION AND NO "SERVICE ENGINE SOON" LIGHT. * 1 0 3 0 8 6
* 7 S 3232-6E