300Tdi Discovery
ZF
1
FAULT DIAGNOSIS
ZF AUTOMATIC GEARBOX
Before referring to fault symptoms, carry out initial
static checks first:
INITIAL STATIC CHECKS
Check start positions
’P’ & ’N’ only
........................................................
Reverse lights
’R’ only
..................................................................
Gear engagements
N-D,N-3,N-2,N-1,N-R
..........................................................
Full throttle
Engine switched off, check full travel at engine and at
.......................................................................
pedal.
Oil level
’N’ selected, engine running at normal running
............................................................................
temperature.
Pressure test
2000 rev/min
10
±
0.3 bar, 150
±
5 lbf/in
2
....................................................................
Idle pressure
6.9
±
0.3 bar, 100
±
5 lbf/in
2
at 665 to 735 rev/min.
....................................................................
To fit pressure gauge
Service tools:
See Service tools, Automatic
Gearbox
0 to 20 bar, 0 to 300 lbf/in
2
Pressure gauge.
Flexible hose adaptor.
1. Site vehicle on a ramp [hoist].
2. From under gearbox, remove socket head plug
(located 10cm from oil pipe) Fit hose adaptor
LST502-1.
3. Fit hose to adaptor.
4. Fit gauge 18G502A to hose and route into
vehicle, ensuring hose is clear of rotating parts
and exhaust pipes.
5. Carry out road test.
See Road Test Procedure
Remove pressure gauge
6. Reverse removal procedure.
