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FAULT TRACING
ROAD-TESTING
(Used together with the
faul,
t -tracing
s'
c heme).
It is important to gain as much information as possible
on the
pr,
e cise nature of
'
a ny fault.
If
possible, go out
in the car with the customer and get him to demon-
strate the fault.
In
all ca ses, the following road-test
procedure
shou
ld
be carried out completely as there
may be more than one fault.
TEST NO.
l. Check that ifhe starter only opera.fes with the
selector
in
"p" 'and "N" and that the reversing
light
operates only
in
"R".
2. Apply
the
brakes and,
wi,
t h the engine running at
normal
idling
spee,d, select "N-D", "N-L" and
"N-R". Transmissi'on engagement
should
be felt
in
each position selected.
3. Check the converter sta!.1 speed with the trans-
mission in
"L" and
"R".
Check for slip or
clutch
squawk.
Note. Do not
sifall
for longer than 10
seconds
or
the transmission wi'" overheat.
4. With the transmission at normal runnling tempe'ra-
ture, se,led "D". Release
,
t he bmkes anda:coelerate
with minimum throttle opening. Check for 1-2 and
2-3 shifts. Note. At min,imum
th,rottle
openings,
the shifts may be
diHicul,
t
to
detect.
Confirmation
that the
tr'
a nsmission is in 3rd gear may be
obtained by 'se,lecting "L", when a 3-2 downshift
should be felt.
5. At just over 30 m.p.h. (50 km.p.h.), select "N",
switch off the ignition and let the ear coast. At
30 m.p.h. (50 km.p.h.)
.
switch on the ignition and
se,lect
"D".
The eng,ine should then start through
the rear
wheels,
indicating
tha'
t the rear oil pump
of
the transmission i·s operating.
6a. Stop and
restart using full throttle
acceleration.
Check for 1-2 and 2-3 shifts according to the
shift speed
~able
in
the "Specifications".
b. At 25 m.p.h.
(40
km.p.h.)
in
3rd gear, depress the
aocelerator to full .throttle position. The car
should
a'ccelerate iln 3rd gear and should not downshift
to 2nd.
c. At 30 m.p.h.
(50
km.p.h.)
in
3rd g ear, depress the
accelerator to the kick-down
pos,i,
t ion.
The trans-
mission
shou
ld
downshift to 2nd gear.
d. At 15 m.p.h.
(25
km.p.h.)
in
3rd gear, depress the
acce'lerator
to the kick-down position. The trans-
missi,on sholJ'ld downshift to
l
st gem.
7a. Stop and restart
using
forced thr,ottle acceleration.
Check for
1-2
and 2-3 shifts according
to
the
shift speed table
in
rthe "Specifi.cations".
b. At 40 m.,p.h.
(65 km
.p.
h.) in
3rd gear, release the
accelerator and select
"L".
Check for 3-2 down-
shift and engine
braking.
Check for roll-out
2-1
downshift
at about 5
m.,p.h. (8 km.p.h.)
and
,
e ngine
braking.
8.
Stop, and
wi,
t h "L" still eng'aged, release brakes
and, using fuH throttle, acce,lemte to 20 m.p.h. (30
klm.p.h.) Check for no slip or clutch squawk and
no upshifts.
9.
Stop
'
a nd select "R". Release brakes and reverse
using fu'" throfttle if possible. Check for no
slip
or
clutch
squ,
a wk.
10. Stop on the hrakes facing downshift on a gradi-
ent and select
"P".
Relea'
s e the brakes and check
that the parking pawl wi,I'1 hold rthecar. Re-apply
the brakes before disengaging the parking pawl.
Repeat wi.th the oar facing uphi,ll. Check that the
selector is trapped by the gate in "P".
4:
47
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