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ENGINE ELECTRICAL
60-3 1
H.E.I. DIAGNOSIS
1.
Insure thnt connector (Fig.
6D-31
or
6D-33)
is
properly nttached.
2.
Insure thnt ell spark plug
leads
are
properly
connected.
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SYSTEM CHECKS
ON THE VEHICLE
- 1
START
A-1. Twist spark plug boot to
loosen. remove lend, insert
extension, hold spark plug
I w d with insulating plien
so extension is 114" away
from dry area of engine
block
while
cranking
engine, or use the ST-125
spark gap tool. Test at
least two wires.
A-2. If sparking occun, check
spark plug, and secondary
wiring. If no trouble is
found,
problem is not
ignition system. No spark,
go to A-3.
A.3.
Measure
voltage
at
"TACH"
terminal.
If
voltage is more than 7
volts cranking, go to A6.
If less, p r o d .
A4. Mensure
voltage
at
d i s t r i b u t o r
"BAT"
terminal. If voltage is more
than 7 volts cranking. go
to A 6 . I f less, proceed.
A-5. Measure voltage at "IGN"
terminal
of
ignition
switch. If morn than 7
volts
cranking,
repair
faulty bulkhead connector
or lead to distributor. If
less, check ignition switch
connections.
If
OK,
replace switch.
A-6. Some module testen have
the capebility of testing
both the pick-up coil and
module while cranking the
engine.
If
tester
is
available,
follow
tester
manufacturer's directions
and omit Steps C-9 thru
C-12.
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A-7. Proceed to COMPONENT
I
CHECKS. IC-1
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ENGINE RUNS ROUGH
r
B-1. Insure that proper fuel is
being
delivered
to
carburetor.
B-2. Check
all
hores
for
leakage.
8-3. Visually inspect and listen
for
sperks jumping to
ground.
1
8 4 .
Check initial timing.
B-5. Check cantrifugsl advance
on engine.
B-6. Check secondary wiring.
8-7. Twist boots to loosen,
remove all spark plug, and
check for: proper gap,
fouling, cracked insulators,
etc.
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B-8. If no defects are found,
follow
procedure under
COMPONENT CHECKS.
Check Pick-Up Coil:
F
C-9. Connect ohmmeter, Step 1
and Step 2, Figure 6D41.
Use middle scale.
C-10. Observe
ohmmeter
throughout vacuum range.
C-11. If Step 1 reads other than
infinite
at
any
time,
replace
pick-up
coil.
Otherwise,
go
to C-13.
C-12. If Step 2 rwds less than
500 ohms, or more than
1500 ohms, at any time,
replace
pick-up
coil.
Otherwise, go to C13.
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C.
COMPONENT
CHECKS
I
C-1. Remove
cnp
and
coil
assembly, Figures 6D-31
and 6D-33.
C-2. Inspect
cap
and
coil
assembly and rotor for
spark arc-over, moisture,
etc.
C-3. If
Step
A-6 was not
performed, check module
with an approved module
tester i f available. If tester
is not available, proceed.
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Check Ignition Coil:
C4. Connect ohmmeter, Step
1, Figures 6D-39 or 6D40.
C-5.
Reading should be less
than 1 ohm on low scale.
If not, replace coil.
Sea
Figums 6D-39 or 40.
C-6A. Internal
Coil:
Connect
ohmrneter both ways, Fig.
6D-39, Step 2. Use high
scale. Replace coil
O H
both readings are infinitn.
C-6B. External Coil:
Connect
ohmrneter, Step 2, Fig.
6D40.
Use high scale.
Reading should be infinite.,
If not, replace coil.
Connect ohmmeter, Step
3. Use high scale. Reading
should not be infinitn. If it
is, replace coil.
C-7. Connect test stand vacuum
source to Vacuum unit.
1
C-8. If
vacuum
inoparativn, replace.
Fig. 6D-38 H.E.I. Diagnosis
C-13. If no trouble has been
found
to
this
point,
replace
module.
If
problem
still
exists.
proceed.
L
C-14. With H.E.I. reassembled,
agein check plug output
for 25KV. If not 25KV.
replace ignition coil.
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