ZF Automatic Transmissions Service Manual
2.2 HYDRAULIC CIRCUIT DIAGRAMS
Component Engagement
Key
To Hydraulic Diagrams (commencing on page 52)
1. 2.
3. 4.
5. 6.
7.
8. 9. 10. 11. 12. 13.
14. 15. 16.
17.
18.
Oil pump Sump
Torque converter
Olil cooler
Clutch 'A' damper
Clutch 'B' valve and damper
Clutch 'Cl' damper
Clutch 'Cl' valve
Clutch 'C' valve and damper
Clutch
'D' valve and damper
Clutch 'E' damper
Clutch
'F' valve and damper
Reverse locking valve
Shift valve
1 - 2
Shift valve 2 - 3
Shift valve 3 - 4
Safety valve
Pressure valve
1
A Clutch 'A' D Clutch 'D B Clutch 'B' E Clutch 'E'
C Clutch 'C' F Clutch 'F'
C1 Clutch 'C"
19.
20.
21.
22.
23. 24.
25.
26.
27.
28.
29.
30.
31.
32.
33. 34.
35.
G
H J K
Pressure valve 2
Torque converter pressure valve
Lubrication valve
Lubrication valve
Lock
-up control valve
Modulation pressure valve
Main pressure valve
Gear change valve
Solenoid valves
MVllMV2l MV3
Pressure regulator
ECM
- inputs and outputs
Engine torque
Throttle valve Engine speed
(RPM) Transmission speed (RPM) Transmission rotary switch
Oil filter
Torque converter freewheel
(C) Clutch freewheel (D) Clutch freewheel (E) Clutch freewheel
Exhaust - Reduced pressure
=X= Th rott le - Modulation pressure
4= Orifice 2- Sump
- Main pressure - Lubrication pressure
- Converter pressure
Throttle pressure
Issue 1 August 1994 51
ZF Automatic Transmissions Service Manual
Problem Possible Cause
2.3.4 Road Test
. Fully check all shift speeds and note. Compare the results with the specification in addition to general observations of transmission behaviour, noises, leaks etc., and consult the following Fault Finding Chart.
Action
CAUTION:
When renewing the transmission, ALWAYS flush out the oil cooler and feed and return pipes.
2.3.5 Electrical Checks
. Check 'Kick-down'.
If any electrical component fault is suspected, refer to Electrical Diagnostic Manual (EDM) to verify the failure mode
before a repair or replacement is attempted.
2.3.6 Fault Finding Chart
Stall speed too low
Stall speed too high and keeps
,ising
hceleration below specification
Top speed below specification
'osition 'P - Park
Nil1 not move out of Park
Ioes not engage Park
Ioes not hold Stator
freewheel faulty allowing stator to
revolve
Engine out of tune
Transmission slip
Engine out of tune
Torque converter freewheel faulty
allowing stator to revolve.
'Kick
-down' switch defective.
Transmission
in 'Limp Home' mode
Engine out of tune
Torque converter freewheel seized
Engine out of tune
Gearshift interlock failure
Check cable adjustment
Parking pawl mechanism sticking
Check cable adjustment
Parking pawl mechanism damaged Renew
torque converter
Check engine tune
Check oil level, check mechanical
failure, renew transmission as
necessary
Check engine tune
Renew torque converter.
Refer to EDM, rectify
I renew
'Kick
-down'switch.
Check.
Check
engine tune
Renew torque converter
Check engine tune
Refer to EDM, rectify
- renew fuse,
check circuits, renew relay and
solenoid.
Check central
'P, check Park switch,
check Brake switch.
Adjust to correct setting
Renew park pawl components:
connecting bar, pawl pin, torsion
spring, pawl, guide piece and guide
sheet.
Adjust to correct setting
Replace park pawl components
61 Issue 1 August 1994
