1994 JAGUAR XJ ZF Automatic Transmission Manual

Automatic Transmissions
Service Manual
Published by Product Development & Publications Jaguar Cars Limited
Part of set- JJM 10 04 12 / 50

ZF Automatic Transmissions Service Manual
CON TENTS
Section Title SRO Page
Foreword ........................................................................\
... ii
I ................ Service Tools & Equipment ........................................................... iii
I1 ................ Torque Tightening Specifications ....................................................... iii
111 ............... Service Materials .................................................................... iii
IV ............... Service Data ....................................................................... \
iii
1.1 .......................................... 1
1.1.7 ............. Torqueconverter .................................................................... 1
1.1.2 ............. Four-speed Epicyclic Gear Train ........................................................ 2
1.1.3
............. Operation Of Gear Train Clutches ...................................................... 3
1.1.4
............. Transmission Output Shaft Extension Housing ............................................ 4
1.1.5.
............ Transmission Control Unit ............................................................. 4
1.1.6 ............. Gearshift Selection ................................................................... 8
1.1.7. ............ Throttle Valve Mechanism (kickdown) ................................................. 8
1.1.8
............. Starter Inhibit Switch ................................................................. 8
1.1.9
............. Gearshift Interlock ................................................................... 8
1.2
.............. Hydraulic Circuit Diagrams ........................................................... 9
1.3
.............. Fault Diagnosis ..................................................................... 33
1.3.1
............. Initial Checks ...................................................................... 33
1.3.2
............. Engine Tune ........................................................................\
33
1.3.3
............. Stall Test ........................................................................\
.. 33
1.3.4
............. Road Test ........................................................................\
.. 33
1.3.5
............. Electrical Checks ................................................................... 33
1.3.6
............. Fault Finding Chart .................................................................. 34
2.1
.............. ZF 4 HP 24 E Transmission - General Description ........................................ 39
2.1.1
............. Torqueconverter ................................................................... 39
2.1.2
............. Four-speed Epicyclic Gear Train ....................................................... 40
2.1.3
............. Operation Of Gear Train Clutches ..................................................... 41
2.1.4
............. Transmission Control Unit ............................................................ 42
2.1.5
............. Transmission Control Module (TCM) ................................................... 46
2.1.6
............. Transmission Rotary Switch ........................................................... 47
2.1.7
............. Decoder Module .................................................................... 47
2.1.8 ............. Performance Modeswitch ............................................................ 47
2.1.9
............. 'Kick-down' Mechanism ............................................................. 47
2.1.10.
........... Reverse Safety Inhibit ................................................................ 47
2.1.11
............ Gearshift Interlock .................................................................. 47
2.1.12.
........... Starter Inhibit Switch ................................................................ 47
2.1.13 ............ Harness Connections ................................................................ 48
2.1.14. ........... Rotary Switch Harness ............................................................... 49
2.1.15 ............ Main Harness Connectors- 12 wayand8 way .......................................... 50
2.2
.............. Hydraulic Circuit Diagrams .......................................................... 51
2.3
.............. Fault Diagnosis ..................................................................... 60
2.3.1 ............. Initial Checks ...................................................................... 60
2.3.2 ............. Engine Tune ........................................................................\
60
2.3.3 ............. Stall Test ........................................................................\
.. 60
2.3.4 ............. Road Test ........................................................................\
.. 61
2.3.5 ............. Electrical Checks ................................................................... 61
2.3.6 ............. Fault Finding Chart .................................................................. 61
2.4
.............. Service Operations ................................................................. 68
............... ZF 4 HP 22 Transmission . General Description
i Issue 1 August 1994

ZF Automatic Transmissions Service Manual
FORE WORD
This manual provides information relevant to the servicing of ZF Automatic Transmission Units 4 HP 22 and 4 HP 24 E (irrespective of the vehicle range to which the unit is fitted). The manual should be used in conjunction with the rel- evant Vehicle Service Manual (VSM) and Electrical Diagnostic Manual (EDM).
It assumes that the transmission has been removed from the vehicle, in accordance with the Vehicle Service Manual,
and is
in a clean condition and all service tools and materials are available.
The manual is divided into two sections covering the ZF
4 HP 22 and ZF 4 HP 24 E and each section is divided into sub- sections covering:
0 Service Information
0 General Description
0 Hydraulic Circuit Diagrams
0 Fault Diagnosis
o Service Repair Operations.
An index can be found at the rear of the manual.
Ne@: For information relating to in-vehicle operations, refer to the Vehicle Service Manual.
ii Issue 1 August 1994

ZF Automatic Transmissions Service Manual
Illustration I JaguarNumber 1 Description Notes
1 To
be issued I I I I
Fixing
11.
Tghtening Torque
(Nm)
TORQUE TIGHTENING SPECIFICATIONS
Description UseS Notes
1 To be issued
Item Description Data
1 I To be issued
Torque Converter: 3rd
1 ,oo: 1
4th 0,73: 1
Reverse 2,09: 1
Stall
speed 2100 RPM i 150 RPM
1 Transmission fluid: I Capacity I8,O Liters I
Transmission unit pressures:
Transmission
fluid type: Fill
I Esso 2D
I Esso 2D, 2E or 3 TOP-UP
Drive: Idle (stationary) 630-710 kPa
Drive: Full Throttle (stall) 780 - 950 kPa
1 Transmission weight: (including torque converter) I74,75 kg I
Transmission Ratios: IIst I 2,48 1 I
I2nd 11,481 I
Reverse: Idle (stationary) I 1070 - 1150 kPa
Reverse: Full
Throttle (stall) 1 1620 - 1780 kPa ~ ~~~
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ZF Automatic Transmissions Service Manual
Item Description I
IC! Service Data (continued)
Data
Tra ns m i ssi on f I u i d :
Transmission fluid type: Capacity
9,5 Liters
Fill Esso 2D
TOP
-UP Esso 2D,2E or 3
Torque converter:
Transmission
weight: (including torque converter)
Transmission Ratios:
I 1st
I2nd
79,65 kg
2,48: 1
I1,48:1
4th
Reverse
Final drive
I3rd
0,73: 1
2,09: 1
3,58: 1
I1,OO:l
Nominal size (diameter)
Torque Stall speed
UK Specification
Federal Specification
280mm
322 Nm @ 2000 RPM
2000 RPM (+ 150 RPM)
1900 RPM (+ 150 RPM)
Ratio I I Gear train end-float I0,2mm to 0,4mm
Electrical data
Solenoid valves;
I MV1, MV2 and MV3 I28 - 60 ohms (33,5 ohms @ 200
Pressure regulator solenoid valve
Output shaft sensor 15-7 ohms
I300 ohms (+ 10%)
I Sensor air gap I0,5mm to 1,Omm I
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ZF Automatic Transmissions Service Manual
1.1 ZF 4 HP 22 TRANSMISSION, GENERAL DESCRIPTION
The ZF Automatic Transmission covered in this section comprises a hydrodynamic torque converter, four speed gear
train and a hydraulic transmission control unit.
1. Torque converter
2. Throttle cable 3. 4-speed gear train 4. Output flange 5. Transmission control unit
Fig.
P \R
HP 22 ZF
6. Oil outlet (drain plug)
7. Selector cable attachment 8. Selector lever positions (see text) 9. Dipstick / oil filler tube 10. Oil cooler connection
.ansmission -
The transmission provides six gearshift positions:
0 Position 'P': Park - in this position the driven wheels are mechanically locked at the transmission.
0 Position 'R': Reverse - reverse gear selected.
0 Position 'N': Neutral - engine disconnected from driveline and wheels.
0 Position 'D': Drive - all four speed ranges are selected automatically with lock-up available in top gear only.
0 Position '3': automatic selection of the lowest three speed ranges only.
0 Position '2': automatic selection of the lowest two speed ranges only, transmission is prevented from shifting
up to the third and top speed ranges.
Immediate selection of a lower ratio is also available by 'kick-down' (pressing the accelerator down beyond the normal
full throttle position) for example when overtaking.
1.1.1 Torque Converter
The torque converter serves two main functions: it acts as a fluid coupling between engine and transmission geartrain
and it provides multiplication of engine torque when required.
The torque converter consists of an impeller, a turbine and a stator which is mounted on a one
-way clutch. The
converter cover is fixed to the impeller to seal the three elements within a common housing forming a closed circuit
through which oil flows when the transmission is in operation. The impeller is therefore connected to the engine and
rotates at engine speed when the engine is operating.
Torque multiplication is at its greatest when the vehicle is driven away from standstill. The stator bears against the
housing through its one
-way clutch and deflects the oil so that the flow is accelerated. As road speed builds up, the
impeller and turbine wheels turn at almost the same speed, so that the stator ceases to accelerate the oil flow and in- stead is disengaged from the housing and turns freely in the flow of oil. At this stage, the torque converter acts as a
fluid coupling.
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ZF Automatic Transmissions Service Manual
The torque converter acts in all four forward gears and in reverse. The converter lock-up clutch closes in 4th gear at
a point depending on road speed and accelerator position; engine power is then transmitted by purely mechanical
means.
A low-loss oil pump in the front of the transmission housing supplies the converter, the automatic gear shift and the
lubrication circuit; oil is drawn from a sump in the bottom of the gear train housing through a filter. The pump drive
gear is keyed to the converter impeller hub and therefore turns when the engine is running, thereby pressurizing the
oil.
Selected ratios
Di, 31, 21
1.1.2 Four-speed Epicychc Gear Train
The torque converter drives a mechanical epicyclic gear train providing four forward ratios and reverse. Individual ra-
tios are obtained by coupling togetherthevarious parts of the geartrain by means of hydraulically actuated multi-disc
clutches and brakes; built in freewheels permit gear shifts without any interruption of the power flow. Operation of the
clutches and gear sets is described
in sub-section 1.1.3.
Each epicyclic (or planetary) gear set comprises a central, sungear, an annulus and a planetary carrier which supports
four small planet gears or pinions. Two gear sets are used in this transmission. A compound gear set comprising front
annulus and planet carrier, rear annulus and planet carrier and a common sungear transmits the drive
in all gears ex- cept REVERSE; a single planetary carrier, annulus and sungear transmits the fourth gear drive. The table below shows
the resulting clutch operation
in the selected gear ratios.
Resulting clutch operation
A Clutch drives annulus clockwise
E Clutch
& OWC drives output shaft clockwise
D2,32,22
D3,33, 23
04
R
Park, Neutral
A Clutch drives annulus clockwise
C1 Clutch holds sungear against anti-clockwise
C Clutch
& OWC holds sungear against anti-clockwise
A Clutch drives annulus clockwise
B Clutch drives sungear clockwise
C Clutch
& OWC holds sungear against anti-clockwise
A Clutch drives annulus clockwise
B Clutch drives sungear clockwise
C Clutch & OWC holds sungear against anti-clockwise
B Clutch drives sungear clockwise
D Clutch holds carrier against clockwise
E Clutch
& OWC drives output shaft anti-clockwise
E Clutch
& OWC applied (hydraulics)
OWC = one way clutch
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ZF Automatic Transmissions Service Manual
1.1.3 Opera tion Of Gear Train Clutches
1st Gear
Clutches 'A' and 'E' are engaged.
The front planet gear carrier of gear set
'1' is locked against
the housing of through freewheel '2'when the engine is pul- ling, but is over-run when the engine is coasting.
Epicyclic gear set '2' rotates as a solid block
with the second
planet set.
2nd Gear
Clutches 'A','Cl','C' and 'E' are engaged.
Freewheel
'4' over-runs.
Clutches
'Cl' and 'C' lock the sun gear to the housing.
3rd Gear
Clutches 'A','B','C' and 'E' are engaged.
Freewheels
'4' and '5' are over-run.
Epicyclic gear sets
'1' and '2' rotate as a solid block at
of 1:l.
ratio
4th Gear
Clutches 'A','B','C' and 'F' are engaged.
Freewheels
'3'.'4' and '5' are over-run.
Epicyclic gear set
'1' rotates as a solid block.
The hollow shaft
with the sun wheel of epicyclic gear set '2'
is locked.
Above a predetermined road speed, lock
-up clutch '6 locks
torque converter '7' solid to prevent slip.
JLL-694 Fig. 1
JLL-69 Fig. 2
54
JLL-69 Fig. 3
JLL - 6 97 Fig. 4
Issue 1 August 1994 3