Pontiac Fiero 1988 Service Manual page 597

6E3-A-14 DRIVABILITY AND EMISSIONS - FUEL INJECTION (PORT)
Q J E E H E I L L I E I
iiaiaiaiBMBEiiBll
i.P. HARNESS CONNECTOR
15 WAY. (FRONT VIEW)
PICK-UP COIL
IGN
15-WAY « K I
I.P. CONN. ! "
12V /
t
o
+ c
639
839
ECM
-IGN.
1
$ J !
r
PNK/WHT
G B R E
it
a
SOLENOID
PNK
6-WAY INJECTOR CONN.
1 INJ. 2,4,6
468A
GRN
468B
GRN
467A
BLU
C15
^INJ. 1,3,5, ^
D16
D15
D14
TACH
LEAD
PRIMARY COIL
7-8-87
WHT 423
PPL/WHT 430
TAN/BLK 424
BLK/RED 453
B5
D5
B3
INJECTOR
DRIVERS
83
|- EST
REFERENCE
BY-PASS
' REF. LOW
07-06-87
*5S1895-6E
CHART A-3
(Page 2 of 2)
ENGINE CRANKS BUT W O N ' T RUN
2.8L " P " SERIES (PORT)
Test Description:
Numbers below refer to circled
numbers on the diagnostic chart.
1. Checks for 12 volt supply to injectors. Due to the
injectors wired in parallel there should be a light
"ON" on both terminals.
2. Checks continuity of CKT 467 and 468.
3. All checks made to this point would indicate that
the ECM is at fault. However, there is a
possibility of CKT 467 or 468 being shorted to a
voltage source either in the engine harness or in
the injector harness.
• To test for this condition:
• Disconnect the injector 6-way connector
• Ignition "ON"
Probe CKTs 467 and 468 on the ECM side
of harness with a test light connected to
ground. There should be no light. If light
is "ON" repair short to voltage.
If OK, check the resistance of the injector
harness between terminals "A" & "C", "A"
& "D",
"B"
& "D",
and
"D"
& "C"
Should be more than 4 ohms.
If less than 4 ohms, check harness for
wires shorted together and check each
injector resistance. (Resistance should be
10 ohms or more.)
If all OK, replace ECM.