Range Rover Classic. Manual — part 74
ZF
9
FAULT DIAGNOSIS
1. E and F Clutch assembly
44
AUTOMATIC GEARBOX
10
FAULT DIAGNOSIS
FAULT SYMPTOMS
SYMPTOM 1 - Intermittent drive and high pitched
noise
FAULT - Low fluid level or restricted filter
SYMPTOM 2 - No drive in reverse
Select ’D’
œ No drive
FAULT - Continue with Symptom 3
œ Drives forward
FAULT - Reverse gear interlock valve
seized
Select ’1’
œ No engine braking
FAULT - Clutch brake 3
SYMPTOM 3 - No drive from rest with ’D’ selected
Select ’1’
œ Vehicle drives
FAULT - No 2 freewheel
œ No drive
Carry out main line pressure check
œ Normal pressure
FAULT - Clutch A
œ No pressure
FAULT - Blocked filter or pump failure
œ Low pressure
FAULT - Restricted filter or sticking primary
regulator
SYMPTOM 4 - Slip in all forward gears
Carry out main line pressure check
œ No pressure
FAULT - Blocked filter or pump failure
œ Low pressure
FAULT - Restricted filter or sticking primary
regulator
œ Normal pressure
FAULT - Clutch ’A’
SYMPTOM 5 - Harsh engagement ’N’ to ’D’
Check engine idle speed
Carry out main line pressure check
œ High pressure
FAULT - Primary regulator stuck
œ Normal pressure
FAULT - Clutch ’A’ or damper for clutch’A’
SYMPTOM 6 - Fierce shift or flare 1st to 2nd shift
Check engine idle speed
Carry out mainline pressure check
œ High pressure
FAULT - Continue with symptom 5
œ Normal pressure
FAULT - Modulator valve or dampers for
clutch brake CB1 and/or clutch brake CB2
FAULT - Clutch brake CB1 and/or clutch
brake CB2
SYMPTOM 7 - Fierce shift or flare 2nd to 3rd
Carry out mainline pressure check
œ High pressure
FAULT - Continue with symptom 5
œ Normal pressure
FAULT - Modulator valve or clutch ’B’
damper
FAULT - Clutch ’B’
SYMPTOM 8 - No 3rd gear
FAULT - 2-3 shift valve
FAULT - Clutch ’B’
SYMPTOM 9 - No 4th gear ’D’ selected
FAULT - 4th to 3rd downshift valve stuck or
3rd to 4th upshift valve stuck
FAULT - Clutch brake 4
ZF
11
FAULT DIAGNOSIS
SYMPTOM 10 - None or harsh engagement of
direct drive clutch
NOTE: The direct drive clutch will only
engage if 4th gear is engaged at 40 to 45
mph (65 to 70 km/h).
Carry out road test pressure check with gauge
connected to torque converter.
œ Normal pressure
FAULT - Failed direct drive clutch
œ Pressures correct but remains high
FAULTS POSSIBLE -
Direct drive clutch and torque converter
control valve stuck
Hysteresis valve stuck
Direct drive clutch control valve stuck
SYMPTOM 11 - Direct drive clutch shift point
incorrect or at low speed
NOTE: Direct drive clutch engagement at
low speed will cause vibration in the
torque converter
Carry out mainline and torque converter pressure
check
œ Normal pressure
FAULT - Governor valve sticking
œ Low or incorrect pressure
FAULTS POSSIBLE -
Direct drive clutch and torque converter
control valve sticking.
Hysteresis valve stuck.
Direct drive clutch control valve stuck.
SYMPTOM 12 - Drives in ’D’ but immediately
upshifts to 3rd
FAULT - 2nd to 3rd shift valve stuck.
SYMPTOM 13 - With ’D’ selected vehicle starts in
2nd
FAULTS POSSIBLE -
1st and 2nd shift valve stuck.
Governor sleeve sticking.
SYMPTOM 14 - With ’D’ selected vehicle starts in
3rd
FAULTS POSSIBLE -
1st to 2nd and 2nd to 3rd shift valves stuck.
Governor sleeve sticking.
SYMPTOM 15 - No kickdown 4th to 3rd
FAULT - 4th to 3rd kickdown valve stuck.
SYMPTOM 16 - Upshifts/downshifts and kickdown
shifts at incorrect road speeds
Check throttle kickdown cable adjustment
Carry out main line pressure check
œ Normal pressure
FAULT - Governor valve sticking
œ Incorrect pressure
FAULTS POSSIBLE -
Incorrect throttle valve adjustment
Primary regulator sticking
SYMPTOM 17 - No upshifts at light throttle
FAULTS POSSIBLE
Governor valve sticking
Shift valves sticking
SYMPTOM 18 - No engine braking ’3’ selected 3rd
gear
FAULT - Clutch ’C’
SYMPTOM 19 - Delayed or no downshift occurs
when making a manual selection from ’3’ to ’2’
FAULTS POSSIBLE -
2nd and 3rd upshift valve sticking.
Governor valve sticking.
’2’ Position interlock valve sticking.
SYMPTOM 20 - At speeds below 28 mph (45 km/h)
when making a manual selection from ’2’ to ’1’,
downshift is delayed or does not occur
FAULTS POSSIBLE -
Governor sticking.
1st to 2nd shift valve sticking.
’1’ Position interlock valve sticking.
SYMPTOM 21 - ’1’ Selected 1st gear no engine
braking
FAULT - Clutch brake 3
SYMPTOM 22 - ’2’ Selected 2nd gear no engine
braking
FAULT - Clutch brake 1
SYMPTOM 23 - Vehicle drives forward in ’N’
FAULT - Clutch ’A’ stuck
ZF
1
REPAIR
ZF AUTO WITH BORG WARNER TRANSFER
GEARBOX
Remove
Underbonnet
WARNING: When using transmissions
jack, follow equipment manufacturers
instructions to ensure safe and effective
use of equipment.
1. Place vehicle on ramp [hoist]. Check road
wheels.
2. Disconnect battery negative lead.
3. Remove fan blade assembly. Note assembly
has left hand thread.
4. Remove air intake hose from plenum chamber
(V8i only).
5. Disconnect kickdown cable from throttle leakage.
6. Release gearbox breather pipes from the rear of
the engine.
7. Remove gearbox dip stick.
Inside Vehicle
8. Select low range, unscrew and remove transfer
gearbox knob.
9. Remove cigar lighter.
10. Remove surround from gear selector panel.
11. Prise out wood veneer panel from centre
console, and disconnect multiplugs from
switches.
12. Remove the five fixings securing the centre
console to the floor, and two clips at the front.
13. Disconnect multiplugs from window lift switch
panel.
14. Disconnect multiplug to selector graphics panel
and remove inset panel.
15. Disconnect electrical leads to cigar lighter.
16. Remove sound deadening trim from top of
gearbox tunnel.
17. Remove retaining plate from transfer gearbox
lever.
Under Vehicle
18. Raise ramp [hoist].
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