ECU LAND ROVER DISCOVERY 1999 Workshop Manual

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-48 REPAIRS
Filter - oil
$% 44.24.07
Remove
1.Remove oil sump gasket.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Gasket - oil sump.
2.Remove Torx screw securing oil pick-up tube
and remove tube.
3.Remove 2 Torx screws securing filter to valve
body and discard 'O' rings. Refit
1.Clean filter and pick-up tube using a lint free
cloth.
2.Fit new 'O' rings to filter.
3.Position filter and tighten Torx screws to 8 Nm
(6 lbf.ft).
4.Position oil pick-up tube and tighten Torx
screw to 8 Nm (6 lbf.ft).
5.Fit oil sump gasket.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Gasket - oil sump.

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-49
Cooler - fluid - Td5
$% 44.24.10
Remove
1.Remove intercooler.

+ ENGINE MANAGEMENT SYSTEM -
Td5, REPAIRS, Intercooler.
2.Disconnect fluid temperature sensor multiplug.
3.Position absorbent cloth under each gearbox
cooler hose connection to collect spillage.
4.Push against coupling release ring and
disconnect both fluid hoses from cooler.
5.Remove screw and release cooler from
radiator.
6.Carefully remove cooler.7.Remove temperature sensor and discard
sealing washer.
Refit
1.Use new sealing washer and tighten
temperature sensor to 14 Nm (10 lbf.ft).
2.Fit cooler, engage with radiator and secure with
screw.
3.Connect temperature sensor multiplug.
4.Ensure connections are clean and fit hoses to
cooler.
5.Fit intercooler.

+ ENGINE MANAGEMENT SYSTEM -
Td5, REPAIRS, Intercooler.
6.Check and if necessary top up gearbox fluid.

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-50 REPAIRS
Cooler - fluid - V8
$% 44.24.10
Remove
1. If fitted: Remove engine oil cooler.

+ ENGINE - V8, REPAIRS, Cooler -
engine oil.
2.Disconnect fluid temperature sensor multiplug.
3.Position absorbent cloth under each gearbox
cooler hose connection to collect spillage.
4.Push against coupling release ring and
disconnect both fluid hoses from cooler.
CAUTION: Always fit plugs to open
connections to prevent contamination.
5.Remove screw and release cooler from
radiator.
6.Carefully move radiator towards engine and
remove cooler.7.Remove temperature sensor and discard
sealing washer.
Refit
1.Use new sealing washer and tighten
temperature sensor to 14 Nm (10 lbf.ft).
2.Fit cooler, engage with radiator and secure with
screw.
3.Connect temperature sensor multiplug.
4.Ensure connections are clean and fit hoses to
cooler.
5. If fitted:Fit engine oil cooler.

+ ENGINE - V8, REPAIRS, Cooler -
engine oil.
6.Check and if necessary top up gearbox fluid.

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-51
Valve body assembly
$% 44.40.01
Remove
1.Remove gearbox oil filter.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Filter - oil.
2.Remove 2 bolts securing speed sensor
harness bracket to valve body.
3.Disconnect multiplug from gearbox housing.
4.Using a 30 mm socket, remove nut securing
multiplug connector block to gearbox housing. 5.Remove 6 long bolts securing valve body to
gearbox.
6.Remove 5 short bolts securing valve body to
gearbox.

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-53
Seal - valve body
$% 44.20.13
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Remove circlips and springs from gearbox
casing noting location of long and short
springs.
3.Using tool LRT-44-005, remove and discard
seals from gearbox casing. Refit
1.Clean gearbox casing, springs and circlips.
2.Fit new seals using tool LRT-44-005, ensure
seals are fully seated.
3.Position springs in their correct locations and
secure with circlips.
4.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-54 REPAIRS
Pressure regulator
$% 44.40.22
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Release and remove clip securing pressure
regulator solenoid valve harness to valve body.
3.Disconnect multiplug from pressure regulator
solenoid valve.
4.Remove 5 Torx screws securing pressure
regulator to valve body and remove pressure
regulator.Refit
1.Clean pressure regulator and mating face with
a lint free cloth.
2.Position pressure regulator to valve body, fit
Torx screws and tighten to 8 Nm (6 lbf.ft).
3.Connect multiplug to pressure regulator
solenoid valve, fit clip and secure harness to
valve body.
4.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1351
3

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-55
Lock-up solenoid valve (MV 3)
$% 44.15.35
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Disconnect multiplug from lock-up solenoid
valve and release harness from clip.
3.Remove Torx screw and retaining fork securing
solenoid valve to valve body.
4.Remove solenoid valve from valve body.Refit
1.Clean lock-up solenoid valve with lint free cloth.
2.Position solenoid valve in valve body.
3.Position retaining fork, fit and tighten Torx
screw to 8 Nm (6 lbf.ft).
4.Connect multiplug to lock-up solenoid valve
and secure harness in clip.
5.Fit valve body assembly.
+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1354A
2
3
4

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-56 REPAIRS
Solenoids - shift control valves
(MV 1 & 2)
$% 44.15.45
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Remove 3 Torx screws securing lock-up
solenoid valve assembly to valve body and
move solenoid aside.
NOTE: This is to gain access to remove Torx
screw and MV2 shift control valve.
3.Note their fitted position and disconnect
multiplugs from shift control valves MV 1 and
MV 2.
4.Remove Torx screw and retaining fork securing
MV2 shift control solenoid valve to valve body.
Note that the tag on the retaining fork faces
towards the valve body.
5.Remove shift control valve from valve body.Refit
1.Clean MV2 shift control solenoid valve with lint
free cloth.
2.Position MV2 shift control solenoid valve to
valve body.
3.Position retaining fork, fit Torx screw and
tighten to 8 Nm (6 lbf.ft).
4.Connect multiplugs to both shift control
solenoid valves.
5.Clean lock-up solenoid valve assembly with a
lint-free cloth.
6.Position lock-up valve assembly, fit and tighten
Torx screws to 8 Nm (6 lbf.ft).
7.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 13521
M44 1353A

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-57
Harness - solenoid valves
$% 44.15.52
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Release and remove clip securing pressure
regulator solenoid harness to valve body.
3.Disconnect multiplug from pressure regulator
solenoid valve.
4.Disconnect multiplugs from lock-up solenoid
valve, shift control solenoid valves MV 1 and
MV 2.
5.Release harness from 5 clips on valve body
and remove harness.6.Disconnect and remove speed sensor from
harness.
Refit
1.Connect speed sensor to harness multiplug.
2.Position harness to valve body.
3.Connect multiplugs to shift control solenoid
valves MV 1 and MV 2 and lock-up solenoid
valve.
4.Connect multiplug to pressure regulator
solenoid valve and secure solenoid valve
harness with clip to valve body.
5.Position and secure harness in clips on valve
body.
6.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1350
M44 1355
M44 1359

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-58 REPAIRS
Electronic control unit - automatic
transmission
$% 44.15.46
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove 3 screws and trim clip securing lower
trim casing to LH front seat.
4.Remove 3 nuts securing speaker power
amplifier bracket to the body.
5.Disconnect multiplug from automatic
transmission ECU located on underside of
amplifier mounting bracket.6.Remove 2 nuts securing ECU to mounting
bracket and remove ECU.
Refit
1.Position ECU to mounting bracket and secure
with nuts.
2.Connect multiplug to ECU.
3.Position speaker power amplifier mounting
bracket to body and secure with nuts.
4.Position lower trim casing to seat and secure
with screws and trim clip.
5.Connect battery earth lead.
6.Fit battery cover and secure fixings.