Pontiac Fiero 1988 Service Manual page 690

DRIVEABILITY A N D EMISSIONS - F U E L INJECTION (PORT) 8E3-C4-5
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• Perform Diagnostic Circuit Check before proceeding with this test. (If a
tachometer is connected to the Tach term., disconnect it before proceeding
w i t h the test).
• Check spark at plug with spark tester J-26792 or equivalent (ST-125) while
cranking (if no spark on one wire, check a second wire) A f e w sparks and
then n o t h i n g is considered n o sparge.
No Spark
• Disconnect 4 term, distributor
connector a n d check f o r spark.
Spark
::nz::
CHART C-4B
IGilTIOM
SYSTEM
CHECK
( R E M O T E COIL/SEALED
M O D U L E CONNECTOR
DISTRIBUTOR)
2 . 8 L " P "
SERIES
(PORT)
Check fueS,spark plugs, etc.
See section " 8 " symptoms.
TEST LIGHT
No spark
x z z z
© Check for spark at coil wire with tester while cranking.
(Leave spark t e s t e r connected t o coil w i r e f o r Steps 3-6).
Spark
Replace pick-up coil
TO D.C
POWER SUPPLY
(1.5
to
8V)
No Spark
n z
® Disconnect distributor 2 term. "C / + " connector.
©Ignition switch " o n " . Engine stopped.
©Check volts a t " + " a n d " C " t e r m ' s , of d i s t h a m . c o n n .
Spark
Inspect cap for water, cracks,
etc. If OK, replace rotor.
B o t h t e r m ' s . 10 volts or m o r e
Both term's, under 10 volts
• Reconnect dist. 2 term. conn.
• With iqn. " O N " , check voltage from tach. term,
to gncf (term, may be taped back in harness).
I
Under 10 volts " C " t e r m , only
Repair wire from module " # " term,
to "B" term, of black Ign. coil
connector or primary ckt. to ign. sw.
I
Check for open or cjnd. in ckt.
from "C" term, to ign. coil. If Ckt.
is OK, fault is. ign. coil or conn..
Over 10 w i t s
1 =
3E
• Connect test light from tach. term, to ground.
• Crank engine and observe light.
Under 1 volt
• z z z z
1 to 10 volts
Repair open tach. lead or
conn and repeat test # 4 .
Replace module and check for
spark from coil as in Step 6.
Light on steady
i _
• Disconnect distributor 4 term, connector.
• Remove dist. cap.
• Disconnect pick-up coil connector from module.
• Connect voltmeter from tach. term, to ground.
• Ignition on.
• Insulate a test light probe to 1/4" from tip and note voltage, as test light
is momentarily connected from a voltage source (1.5 to 8V) to module
term. "P".(Fig. 1).
Winks
Spark
System
OK
No Spark
Z E Z Z
Replace ign. coil,
it too is faulty
Replace ignition coil and recheck
for spark with spark tester. If still
no spark, re-install original coil
and replace dist. module..
Voltage drops
• Check for spark from coil wire with spark tester
as test light is removed from module term.
No drop in voltage
J T Z Z Z Z Z Z
Check module ground.
If OK, replace module.
No Spark
© If no module t e s t e r (J24642) is available;
Replace ign. coil and repeat Step 5.
• if module tester (J24S42)
is available: test module
Spark
* is rotating pole piece
still magnetized?
No Spark
Ign. coil removed is OK,
reinstall coil and check coil
wire from dist. cap. if OK,
replace dist. m o d u l e .
Spark
n
System OK
OK
Check coil wire
from cap to coil. If
OK, replace coil.
Mot OK
r z
Yes
Replace
module
Check pick-up coil
or conns. (Coil
resistance should
be 500-1500 ohms
and not grounded).
No
31
Replace pole
piece and
shaft assy.
7-21-86
* 5 S 1444-6EA