•
•
THE
AUTOMATIC TRANSMISSION
FAULT DIAGNOSIS
Faults
Faulty gear selection, possibly with tie-up in
'D'
position
on
kick-down
Slip
or
no drive in forward gears
Slip in reverse
Slip
or
no drive
in
all gears
Difficult
or
bumpy selection and shifts possibly with squawk on selection and with lubrication
warning light
on
or
low gauge pressure
Erratic automatic shifts
..
Incorrect shift speeds
Excessive creep or engine stalls when selecting gear
Unable to tow-start
Gear whine consistent with road speed but not in
'top'
gear
(4)
Continual whine consistent with engine speed
No
drive in 'first' gear
(1)
automatic and manual
Slip or no drive in 'second' gear
(2)
automatic and manual
..
No
drive in
2,
3,
or
4 positions manual
but
drives in these gears on automatic
'D'
No
drive in
2,
3,
or
4 automatic
'D'
positions,
but
drives in these gears on manual selection
Poor acceleration
..
Reduced maximum speed in all gears with severe converter overheating
..
DIAGNOSIS AND RECTIFICATION CHART
Fa
Diagnosis and
Rectification
Sequence
1
2,3
4, 5, 6
7,8,
13,20,23
7,8,9,
13,20
7,
10
11
12
13,
14
15
16
17,
18
19
13
13
21
22
1
2
3
4
5
•
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
•
23
Check gear change cable and selector rod adjustment (Section Fa.2).
Check the fitting
of
forward clutch feed pipe (Section Fa.3).
Check the forward clutch and/or the shaft rings (Section Fa.6).
Check the reverse gear band adjustment
or
remove the valve block and check the reverse servo feed pipe
'0'
ring seals (Section FaA).
Remove the valve block and clean; regulator valve
or
reverse booster piston faulty (Section FaA).
Check the
top
and reverse clutch booster piston
or
shut-off valve (Section Fa.IO).
Check engine/transmission oil level (Section Aa.I).
Carry out pressure check (Section Fa.2).
Check oil filter head
'0'
ring seals
or
fitting
of
joint washer (Section Aa.2).
Remove and examine governor unit for sticking (Section Fa.5).
Check governor control rod adjustment (Section Fa.2).
Check carburetter adjustment-incorrect idle speed (Section Da.2).
Remove and clean valve block (Section Fa.4).
Check auxiliary pump, pipes, and seals (Section Fa.5).
Check gear train adjustment (Section Fa.7).
Check converter housing bush (Section AaA).
Check free-wheel support dowel
bolt-sheared
(Section Fa.3).
Check the one-way clutch unit (Section
Fa.II).
Remove the valve block and check the servo feed pipe
'0'
ring seals and check the second gear band adjust-
ment (Section FaA).
Check main oil pump and
flow
valve, the supply and feed pipe seals, and main oil strainer seals (Sections
Aa.8 and Fa.3).
Carry out stall speed check (Section Fa.2).
Change the torque converter unit (Section AaA).
Check the low pressure valve.
MINI.
Issue
2.
16495
Fa.15
mk1-performance-conversions.co.uk
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