Range Rover 2. Electrical Manual — part 171
IGNITION AND SHIFT INTERLOCK
C1
2
CIRCUIT DIAGRAM
REV: 08/99
P
0
1
1
R
0
0
1
N
1
0
1
D
1
0
0
3
0
0
0
2
0
1
0
1
1
1
0
Z*
1
1
1
X
Y
Z
Z238
Body Electrical
Control Module
(BECM)
Z238
Body Electrical
Control Module
(BECM)
9
C1276
W
15
1
C0075
[1]
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
0
[1]
0
S211
See Fuse Details
13
C1280
WK
X134
Ignition Switch
8
W
0
I
II
III
0
I
II
III
3
2
C0028
See Ground
Distribution
E0562
4
C0028
3
GP
4
C1276
S201
2
C0075
YP
Anti–Lock Brake
System
F 17
10 A
1 =
0 =
* =
Switch Open
Switch Closed
Fault
8
UB
1
X294
Gear Box
Position Switch
[1]
X Switch
[2]
Y Switch
[3]
Z Switch
[1]
0
9
UP
2
See Ground
Distribution
6
BS
E0808
C0244
[2]
0
5
C0745
4
3
18
C1287
UG
3
[3]
0
C0244
5
C0988
S608
S609
S610
Automatic
Gearbox
C0988
C0745
X
Y
Z
IGNITION AND SHIFT INTERLOCK
C1
3
CIRCUIT DIAGRAM
REV: 11/99
See Fuse Details
X298
Transfer Micro
Switch/Shift Lock
Solenoid
[1]
Transfer
Micro Switch
[2]
Lo Range
Selected
[3]
Shift Lock
Solenoid
(with Shift
Lock only)
[4]
Park Switch
PR
Transfer Gearbox
6
C1290
0
[2]
Z238
Body Electrical
Control Module
(BECM)
[1]
[3]
2
5
1
B
S607
E0808
4
B
S611
See Ground
Distribution
NW
3
C1279
0
[1]
1
C0672
X229
Key–In Switch
[1]
Key
Inserted
PG
30
F 13
20 A
[4]
3
C0673
6
C0673
B
PY
P125a
Engine
Compartment
Fuse Box
8
C0574
1
C0069
K191
Ignition Key Lock
Solenoid
PY
3
C0069
30
10 A
F 42
2
C0229
C0069
4
C0868
C0903
2
C0672
E0562
See Fuse Details
Z294
Ignition Key Lock
Solenoid Diode
S228
S229
PN
(MY 2000)
(MY 2000)
PN
PY
KEY INFORMATION
i
Component is disconnected.
Backprobe harness connector
Component is connected.
Backprobe harness connector
Component is disconnected.
Probe component
Component is disconnected.
Probe harness connector
Probe inĆline connector
TERMINAL
NUMBER
DESIGNATION
50
Battery voltage: Ignition Switch
in position III
30
Battery voltage: supplied constantly
15
Battery voltage: Ignition Switch
in position II or III
R
Battery voltage: Ignition Switch
in positions I, II
31
Ground
CIRCUIT DIAGRAMS
Circuit diagrams are arranged so that
current flow is from the top of the diagram
(current source) to the bottom of the
diagram (ground).
D
D Only those components that work together
in the circuit are shown. If only part of a
component is used in the circuit, then only
that part of the component is shown.
D Remember:
Entire component
Part of a component
D
DIAGNOSIS
If the diagram is accompanied by text:
- Read the Circuit Operation before
proceeding with the electrical diagnosis.
- Read the Troubleshooting Hints before
performing the System Diagnosis.
- Tests follow the System Diagnosis
- When performing the System Diagnosis,
be certain that all components
disconnected in previous steps are
reconnected unless otherwise directed.
See Introduction (i) for additional
circuit diagram symbols.
ANTI-LOCK BRAKE SYSTEM
D1
CIRCUIT OPERATION
1
REV: 11/2000
CIRCUIT OPERATION
The Anti–lock Braking System (ABS) prevents wheel
lock–up during braking. This enables the driver to
maintain vehicle stability and steering control while
braking.
The Electronic Traction Control (ETC) system
prevents wheel slip to maintain optimum traction on
slippery surfaces. Up to 99 Model Year, ETC
operates only on the rear wheels at vehicle speeds
below 50 km/h (30 mph). From 99 Model Year, ETC
operates on all four wheels at vehicle speeds below
100 km/h (62.5 mph).
Anti–lock Braking System Electronic Control Unit
(ECU) (Z108)
The ABS ECU (Z108) is a computer that controls
ABS operation by permanently monitoring the
vehicle’s four wheel speeds when the ignition switch
is in position II. If an impending wheel lock–up is
detected during this monitoring, the ABS ECU will
apply voltage to the applicable inlet and outlet valve
solenoids contained in the ABS Booster Unit (Z103).
Operation of the solenoid valves regulates the
pressure applied to the brake caliper and prevents
wheel lock–up.
ETC is an extension to the ABS ECU. In addition to
monitoring the wheel speeds for lock–up, the ABS
ECU also monitors wheel speeds for wheel slip (i.e.
wheel speed faster than vehicle speed). When wheel
slip is detected, the ABS ECU will apply braking
pressure to the slipping wheel(s), causing the wheel
speed to slow to vehicle speed and torque to be
transferred to the non–slipping wheel(s). The ABS
ECU applies the brake by operating the applicable
inlet and outlet solenoid valves in the ABS Booster
Unit.
The ABS ECU has diagnostic capabilities that allow
it to detect faults that may impair the system’s
efficiency. If a fault occurs, the ECU adopts a default
strategy which illuminates the ABS or the TC
warning light in the instrument cluster (Z142) and
stores a fault code in its memory to aid system
troubleshooting. When an ABS fault has been
detected, the message ABS FAULT may also be
displayed in the instrument cluster message centre.
When an ETC fault has been detected, the message
TRACTION FAILURE is displayed and on the first
detected fault a single audible chime sounds. Fault
codes stored in the ECU memory can be retrieved
using Testbook or a universal scan tool.
The ABS ECU also performs a bulb check of the
warning lights when the ignition switch is first turned
to position II. The ABS warning light is illuminated for
1 second, extinguished for 0.5 seconds and
illuminated again until the ECU receives an input
speed of 7 km/h (5 mph) from all four wheel speed
sensors (X137, X140, X1158, X161) and is then
extinguished. The TC warning light is illuminated for
3 seconds and then extinguished. If a system fault is
detected during the bulb check the ABS or the TC
warning light remain illuminated.
When ETC is activated, the TC warning light
illuminates, a single audible chime sounds and on
earlier models, the message TRACTION is
displayed. The message and warning light extinguish
after 2 seconds minimum or when ETC is
de–activated. If ETC is continuously or repeatedly
active and there is a risk of the brakes overheating
the ABS ECU disables the ETC. To advise the driver
of the disablement, the ETC warning light flashes for
10 seconds minimum, a single audible chime sounds
and the message TRACTION OVERHEAT is
displayed. The ABS ECU restores ETC availability
after allowing time for the brakes to cool.
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