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8D - 10
IGNITION SYSTEMS
•
• I f voltage remains a t "near b a t t e r y " voltage d u r i n g
t h e entire 5 seconds, t u r n t h e k e y off a n d remove the
60-way connector (Fig. 3) f r o m t h e SBEC. Check 60-
way connector for any spread t e r m i n a l s .
CONNECTOR
TERMINAL SIDE
SHOWN
J908D-42
Fig. 3 SBEC 60-Way Connector
(3) Remove test lead f r o m t h e coil positive t e r m i n a l
and connect a n 18 gauge j u m p e r w i r e between t h e
battery positive t e r m i n a l and t h e coil positive t e r m i -
n a l .
(4) M a k e t h e special j u m p e r shown i n F i g u r e 4. Us-
i n g the j u m p e r , m o m e n t a r i l y ground t e r m i n a l n u m -
ber 19 o f t h e 60-way connector. A spark should be
generated a t t h e coil cable w h e n t h e g r o u n d i s re-
moved.
CAPACITOR
GROUND
THIS
CLIP
CONNECT THIS-
CLIP TO COIL
NEGATIVE
ALLIGATOR CLIP
PR 100.?
Fig. 4 Special Jumper—Ground to Coil Negative
Terminal
(5) I f spark is generated, replace the SBEC.
(6) I f no spark is seen, use t h e special j u m p e r to
ground t h e coil negative t e r m i n a l directly.
(7) I f spark is produced, repair w i r i n g harness for
an open condition.
(8) I f no spark is produced, replace the i g n i t i o n coil.
POOR PERFORMANCE TEST
To prevent unnecessary diagnostic t i m e a n d w r o n g
test results, t h e "Testing F o r Spark A t C o i l " should
be performed prior t o t h i s test.
WARNING:
APPLY
PARKING
BRAKE
AND/OR
BLOCK
WHEELS
BEFORE
PERFORMING
IDLE
CHECK/ADJUSTMENT, OR ANY TEST WITH AN OP-
ERATING ENGINE.
Check a n d adjust basic t i m i n g . Refer t o t h e Speci-
fication a n d Service Procedure sections. Refer t o O n
Board Diagnostics i n the F u e l Injection General D i -
agnosis sections o f Group 14.
COOLANT TEMPERATURE SENSOR TEST
(1) T u r n t h e i g n i t i o n k e y t o t h e off position. Dis-
connect w i r e connector f r o m coolant temperature sen-
sor.
(2) Connect one lead o f ohmmeter t o one t e r m i n a l
of coolant temperature sensor (Fig. 5).
OHMMETER
RR8DG20
Fig. 5 Coolant Temperature Sensor Test
(3) Connect the other lead of ohmmeter t o r e m a i n -
i n g t e r m i n a l o f coolant temperature sensor.
• W i t h t h e engine/sensor a t n o r m a l operating tem-
perature, about 93°C (200°F), t h e sensor impedance
should be approximately 700 t o 1,100 ohms.
• W i t h
t h e engine/sensor
a t room temperature,
about 21°C (70°F), t h e sensor impedance should be
approximately 7,000to 14,000 ohms.
R e f e r t o " O n B o a r d D i a g n o s t i c s " i n t h e F u e l
I n j e c t i o n G e n e r a l D i a g n o s i s s e c t i o n s o f G r o u p 14
f o r f u r t h e r t e s t p r o c e d u r e s .
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
TEST
Refer to " O n Board Diagnostics" i n the F u e l Injec-
t i o n General Diagnosis sections o f Group 14 for M A P
sensor testing.
SPARK ADVANCE (SBEC CONTROLLED) TEST
(1) Set basic t i m i n g . (Refer to I g n i t i o n T i m i n g Pro-
cedure i n t h e Service Procedures
Section of t h i s
group).
(2) Engine a t operating temperature. T h e tempera-
t u r e sensor m u s t be connected and w o r k i n g properly.
(3) Raise and m a i n t a i n engine speed t o 2000 r p m ,
w a i t one m i n u t e and check advance (the D R B I I diag-
nostic tool " S E T E N G I N E R P M " test i n " S P E C I A L
F U N C T I O N S " mode can be used t o raise and m a i n -
t a i n engine speed). Refer t o Specifications a t the rear
of this group. Advance specifications are i n addition
to basic advance.
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