Pontiac Fiero 1988 Service Manual page 476

D R I V E A B I L I T Y AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-21
© PROBE FUEL PUMP TEST TERMINAL WITH A TEST LIGHT
TO GND.
e IGN. "OFF" FOR 10 SECONDS.
• IGN. "ON"
© TEST LIGHT SHOULD LIGHT FOR 2 SEC. AFTER IGN. "ON".
DOES IT?
NO
H Z
• DISCONNECT PUMP RELAY.
• IGN. "ON", ENGINE STOPPED.
• PROBE RELAY HARNESS CONNECTOR TERMINAL
"D" WITH A TEST LIGHT TO GROUND.
LIGHT "ON"
~i
CONNECT A TEST LIGHT BETWEEN HARNESS
CONNECTOR TERMINALS "D" AND "C".
LIGHT "ON"
J
• CONNECT TEST LIGHT BETWEEN TERMINAL "A" AND
GROUND.
• IGN. "OFF" FOR 10 SECONDS.
• NOTE TEST LIGHT DURING 2 SECONDS AFTER IGN. "ON"
LIGHT "ON"
• FAULTY RELAY.
• IF ORIGINAL SYMPTOM WAS "ENGINE CRANKS BUT
WILL NOT RUN", CONTINUE TESTING OF OIL
PRESSURE SWITCH.
• ENGINE AT NORMAL OPERATING TEMPERATURE.
• OIL PRESSURE NORMAL.
© DISCONNECT FUEL PUMP RELAY. ENGINE SHOULD
CONTINUE TO RUN.
DOES IT?
YES
X
RECONNECT FUEL PUMP RELAY.
IGNITION "OFF".
PROBE FUEL PUMP TEST TERMINAL
WITH A TEST LIGHT TO GROUND.
LIGHT "OFF"
;:::! _ :
NO TROUBLE FOUND
CHART A-5
FUEL PUMP RELAY CIRCUIT
2.5L "P" SERIES (TBI)
YES
NO TROUBLE FOUND
LIGHT "OFF"
INSPECT FUEL PUMP FUSE
FUSE BLOWN
FUSE NOT BLOWN
REPAIR SHORT
TO GROUND IN
CKT440 OR 120
REPAIR OPEN
CKT 440
LIGHT "OFF"
REPAIR OPEN
GROUND CKT450
1
LIGHT "OFF"
I
CHECK FOR OPEN OR SHORT TO GROUND
IN CKT 465. IF OK, IT'S A FAULTY ECM.
NO
H Z
FAULTY OIL
PRESSURE SWITCH
LIGHT "ON"
FAULTY OIL
PRESSURE SWITCH
4-11-87
*7S 3234-6E