Range Rover 2. Electrical Manual — part 15
STARTING AND CHARGING
B1
7
TROUBLESHOOTING
Starter Solenoid
Relay
Engine Compartment
Fuse Box
P125a
Engine Compart-
ment Fuse Box
P125a
Engine Compart-
ment Fuse Box
BAT VOLT
Test A
OK
OK
OK
OK
3A
1A
2A
CONDITIONS
Ignition Switch
Position: III
RESULTS
BAT VOLT
CONDITIONS
Ignition Switch
Position: 0
RESULTS
D
D
2A
PROBLEM CAUSE
NR Wire
-
- Starter Solenoid
PROBLEM CAUSE
-
V
V
C508
C575
NR
WR
C177
-
STARTING AND CHARGING
B1
8
TROUBLESHOOTING
Starter Solenoid
(K136) terminal con-
nection
Battery Terminal Con-
nection
Less than 0.5V
M134
Starter
Z238
Body Electrical
Control Module
(BECM)
OK
OK
PROBLEM CAUSE
OK
OK
2B
3A
1B
CONDITIONS
Ignition Switch
Position: 0
RESULTS
BAT VOLT
WR
CONDITIONS
Ignition Switch
Position: III
RESULTS
Wire
-
D
D
Test B
2A
PROBLEM CAUSE
Body Electrical Control Mod-
ule (BECM)
-
PROBLEM CAUSE
R Wire
-
-
C113
V
WR
V
R
M
R
R
-
Ignition Switch
-
Wire
- WR
Wire
- B
STARTING AND CHARGING
B1
9
TROUBLESHOOTING
Z238
Body Electrical Control
Module (BECM)
BAT VOLT
OK
OK
PROBLEM CAUSE
OK
OK
2B
1C
CONDITIONS
Ignition Switch
Position: III
RESULTS
Less than 0.5V
B
CONDITIONS
Ignition Switch
Position: II
RESULTS
Wire
-
-
D
D
D
Engine running
Battery Terminal Con-
nection
Ground Connections
-
Test C
1B
PROBLEM CAUSE
Starter
-
- Starter Solenoid
PROBLEM CAUSE
NY Wire
-
PROBLEM CAUSE
Body Electrical Con-
trol Module (BECM)
-
V
C114
V
B
B
NY
Instrument Cluster
-
CRUISE CONTROL
B5
CIRCUIT OPERATION
1
CIRCUIT OPERATION
Petrol Engine
For vehicles equipped with a manual transmission,
cruise control can only be activated when the Cruise
Control Switch (X115) is depressed, the transfer
gear box is in Hi range, and the clutch pedal is not
depressed. Also, the BeCM (Z238) will deactivate
cruise control if the engine rpm rises above 5000
±
10%, due to the possibility of selecting gears
manually without the use of the clutch.
For vehicles equipped with an automatic
transmission, cruise control can only be activated
when the Cruise Control Switch (X115) is depressed,
the transfer gear box is in Hi range, and the
transmission is in one of the forward gears.
With the Cruise Control Switch (X115) on, a ground
signal is applied to C255/Pin 14 of the BeCM
(Z238).The BeCM (Z238) then suplies signal voltage
via its Pin 18 to the Converter/Inverter (Z249), to Pin
10 of the Cruise Control ECU (Z121) and to the
“Operation” bulb of the Cruise Control Switch (X115).
The transfer gearbox Hi range status from the
Transfer Gear Box ECU (Z256) is applied to
C626/Pin 3 of the BeCM (Z238). The X, Y, and Z
switch status (PRND321 position information) from
the gearbox position switch is applied to C626/Pins
8, 9, and 18 of the BeCM (Z238). The clutch pedal
position input is applied to C255/Pin 4 and the
engine speed input C112/Pin 9 of the BeCM (Z238).
When the transfer gearbox is in Hi range, a forward
gear is selected and the Cruise Control Switch
(X115) is on, theBeCM (Z238) suplies voltage via
C258/Pin 1 and the Brake Switch Vent Valve (X112)
to the Cruise Control ECU (Z121) Pin 9, which then
“knows” that cruise control can be operated.
When cruise control is activated and a cruise speed
is set, the Cruise Control ECU (Z121) applies
voltage through the OU wire and ground through the
OR wire to operate the Cruise Control Vacuum
Pump (M103) motor. The Cruise Control ECU (Z121)
applies ground through the OK wire to close the
normally open solenoid valve in the pump. The pump
applies vacuum to the actuator.
SET/ACCEL
To set a cruise speed, the Cruise Control Switch
(X115) must be on and vehicle speed must exceed
28 mph (45 km/h). When the SET/ACCEL Switch is
depressed under these conditions, the
Converter/Inverter (Z249) is supplied with a ground
signal. This signal is “converted” to a voltage signal
and is transmitted via the SY wire to the Cruise
Control ECU (Z121) terminal 3, causing the vacuum
pump to operate. When the SET/ACCEL Switch is
released, the signal is removed from terminal 3,
signalling the ECU to set the speed.
RES/DECEL
When the RES/DECEL Switch is depressed, a signal
is applied via the RY wire to terminal 4 of the Cruise
Control ECU (Z121). This tells the ECU (Z121) to
disengage the system and the vehicle slows down.
When the switch is depressed a second time, the
signal is again applied to the ECU (Z121) and the
vehicle returns to the previously set speed.
Speed Input
Terminal 11 of the Cruise Control ECU (Z121)
receives the Vehicle Speed output signal from the
BeCM (Z238) through the Y or YR wire. The BeCM
(Z238) receives the vehicle speed signal from the
Anti–lock Brake System ECU (Z108). The signal is a
pulsing voltage and its frequency changes with
vehicle speed.
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