Pontiac Fiero 1988 Service Manual page 470

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-15
®
• IGN "ON" - IF S.E.S. LIGHT IS OFF, SEE CHART A-1.
• INSTALL "SCAN" TOOL - IF "NO ALDL", SEE CHART A-2.
• CHECK THE FOLLOWING:
• TPS - IF OVER 2.5V AT CLOSED THROTTLE, SEE CODE 22.
• COOLANT - IF BELOW -30°C, SEE CODE 15.
• RPM - IF NO RPM, WHILE CRANKING, SEE CHART A-3,
PAGE 2 OF 3.
CHART A-3
(Page 1 of 3)
IGINE CRANKS BUT WON'T RUN
2.5L "P" SERIES (TBI)
• PROBE FUEL PUMP TEST TERMINAL WITH A TEST LIGHT TO GND.
• IGN "OFF" FOR 10 SECONDS.
• IGN "ON".
• TEST LIGHT SHOULD LIGHT FOR 2 SEC. AFTER IGN. "ON".
DOES IT?
©
0
®
YES
CRANK ENG. AND CHECK FOR SPARK WITH
ST-125 ON 2 WIRES 1-2 OR 3-4.
CHECK ONE WIRE AT A TIME. LEAVE THE
OTHER WIRES CONNECTED TO THE SPARK
PLUGS DURING CRANKING.
IS THERE SPARK ON BOTH WIRES?
YES
• DISCONNECT INJECTOR CONNECTOR.
© CRANK ENGINE.
IS THERE FUEL SPRAY FROM INJECTOR?
NO
« CONNECT INJECTOR TEST LIGHT
TO HARNESS CONNECTOR.
• CRANK ENGINE.
DOES TEST LIGHT BLINK?
YES
H Z
FAULTY INJECTOR
OR O-RING.
YES
H Z
RECONNECT INJECTOR CONNECTOR.
CRANK ENG.
IS THERE FUEL SPRAY FROM INJECTOR?
NO
| SEE FUEL PUMP RELAY |
i CIRCUIT CHART A-5
»
NO
SPARK ON ONE
3L
SEE CHART A-3, PAGE 2. ]
NO SPARK
•
FAULTY IGN. MODULE
NO
] SEE CHART A-3
i PAGE 3 OF 3.
i .
YES
ZIZ
CHECK FOR:
• FOULED SPARK PLUGS.
© EGR VALVE STUCK OPEN.
LOW FUEL PRESSURE
(CHART A-7), DIAGNOSTIC
AIDS FACING PAGE.
NO
H Z
• IGN "OFF:.
• INSTALL FUEL PRESSURE GAGE
• IGN "ON".
e FUEL PRESSURE SHOULD BE 62-90 KPa (9-13 psi)
IS IT?
YES J O
FAULTY INJECTOR
j SEE FUEL SYSTEM
i DIAGNOSIS CHART A-7
4-14-86
*7S3230-6E