Pontiac Fiero 1988 Service Manual page 466

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-11
CHART A-1
NO "SERVICE ENGINE SOOWTUGHT
2.5L "P" SERIES (TBI)
DOES THE ENGINE START?
YES
H
• IGNITION "OFF".
• DISCONNECT ECM CONNECTORS.
• IGNITION "ON"
• PROBE CKT 419, WITH TEST LIGHT
TO GROUND.
IS THE S.E.S. LIGHT "ON"?
YES NO
FAULTY ECM
CONNECTION
OR ECM.
CHECK:
- GAGE FUSE
- FAULTY BULB
- OPEN CKT419
- CKT419 SHORTED TO
VOLTAGE.
- OPEN IGN. FEED TO
BULB.
©
©
NO
I
IS ECM BATTERY FEED
CKT 240 AND ECM FUSE OK?
YES
IGNITION "OFF"
DISCONNECT ECM
CONNECTORS.
IGNITION "ON"
PROBE CKT 240 & 439
WITH TEST LIGHT TO
GROUND.
IS THE LIGHT "ON" ON
BOTH CKTS?
YES
FAULTY ECM
GROUNDS OR ECM.
NO
LOCATE AND CORRECT
SHORT TO GROUND IN
CKTTHAT HADA
BLOWN FUSE.
NO
RLPAIR OPEN IN CKT
THAT DID NOT LIGHT
THE TEST LIGHT.
CLEAR CODES AND CONFIRM "CLOSED LOOP " OPERATION AND NO "SERVICE ENGINE SOON" LIGHT.
4-24-86
7S 3273-6E