Land Rover Range Rover Etm 1997 99 Gems 6th Edition Rover Manual

							A1SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)
12CIRCUIT DIAGRAM18
Z132
Engine Control
Module (ECM)
27 C50529
31 4
Z255
Auto Gear Box
Control Unit
X294
Gear Box Posi-
tion Switch
E529
S551
5
YO
See Ground Dis-
tribution SP SR ULG
Not used
C501
C551
6 4 1 C501
C551564 1
4 C562
C559
C659B
B 5 C562 719
OY
C601 47 21 32
P
R
D321
N
B
2 C551
C501
S505
B Automatic
TransmissionManual Trans-
mission
C507
BO
3
3
Z256
Transfer Gear
Box ECU
C603 28
UN
ULG C560
C660 4 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
13CIRCUIT DIAGRAM
Z108
Anti±Lock Brake
System ECU
28 C116R
Z238
Body Electrical
Control Module
(BECM)
YG
C116LLHD
RHD
Z132
Engine Control
Module (ECM)
GB
Z165
Air Suspension
ECU
30 C117
S214
9C506KR
7 C231
11 C114
S104
13C106
C506 13 C112
27
23
C106
KR
X318
Data Link Connector
(OBDII)
15 C102
C202
Data Link Con-
nector KRK
BBY
7 C50726C505 22 23S NAS Except NAS
BY
BY
5C114
4C106B
S
2
B
1
GB
3C506B
BY
4C106A
S
2
BGB
3C506A1
GB
16
B
5
S
9C112
NAS
Except NAS
C507Y
C506B
C106B
YK
7
Z108
Anti±Lock Brake
System ECU
C116R 29
1 C507
NAS
LHD 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
14CIRCUIT DIAGRAM
Z132
Engine Control
Module (ECM)
29C507
S102
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
[1] [2]
X312
Pressure Switch
2
[1] < 13 Bar
(189 psi)
[2] > 17 Bar
(247 psi) Heated Front
Screen
2
21 C507
5 C244
1 C505
14
28
13 C246B8 C244
1 C143
2 C143
PGBG BS YB
7 6 1 C506
C106
10112 11C102
C202
YB PG
With Air Condi-
tioning only 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
15CIRCUIT DIAGRAM
30
F 1
10 AZ238
Body Electrical
Control Module
(BECM)
See Fuse Details
2 C505
7 C258Z132
Engine Control
Module (ECM)
S205
4C506GUC106
8C102
C202
19 C242
414
Z142
Instrument
Cluster
[15] Control Unit
and Mess-
age Centre
Display
15 C24251331221887
LG
3
C256
LG
11
OG
9
OG
1
RG
10
RG
2
BG
5
BG
14
B
E254
Z238
Body Electrical
Control Module
(BECM)[15]
P P
17
BMALFUNCTION
INDICATOR LAMP
(CHECK ENGINE)SERVICE REMINDER
INDICATOR
(SERVICE ENGINE) 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
16CIRCUIT DIAGRAM
C509 1314
Z132
Engine Control
Module (ECM)
S509
Z261
Ignition Coils
151 3 2 4 C525 11&6 2&3 4&7 5&8 5 C525W
See Fuse DetailsP125a
Engine Compart-
ment Fuse Box
15
F 26
20 A
WB WU WY WK
R
RR R
UO PG
C508 8 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
17CIRCUIT DIAGRAM
P125a
Engine Compart-
ment Fuse Box
[15] Ignition Relay
8 C173
Z238
Body Electrical
Control Module
(BECM)
W
2 C502
9 C120
S134
1 C502
Not used
UR NAS
From VIN 370859
10C106
C506
F
A1-4
RL15
[15]
See Power Distribu-
tion 2 
						

							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
18CIRCUIT DIAGRAM
X320
Fuel Pressure
Sensor
R
11 C506B 13
C106B 1 C122 2
3 C122
GO RB12
C106B C506B
S502
Z132
Engine Control
Module (ECM)
C507 30
H
A1-9 NAS
from model year
98
G
A1-9
Partial 
						

							DIESELA6
CIRCUIT OPERATION1
CIRCUIT OPERATION
Sensors
Engine Speed Sensor (X255)
The engine speed signal is crucial to the system, as
the information from the sensor is used in virtually all
of the strategies within the `DDE (Digital Diesel
Electronics) and its Engine Control Module (ECM)
(Z132). Through this sensor, the ECM (Z132) knows
if the engine is turning, how fast it is turning and
approximately where the engine is in its cycle. The
sensor is of the `Hall effect type, which sends out a
pulse to the ECM (Z132) every time a `tooth is
sensed on the flywheel (the flywheel has six `teeth).
If the sensor fails, then the warning lamp is activated
and the ECM (Z132) enters a `limp home mode
where the ECM (Z132) looks at the signal from the
needle lift sensor in one of the injectors. The needle
lift sensor gives one pulse per injection, i.e. one
pulse per twelve engine speed sensor pulses. The
response of the ECM (Z132) to changes in engine
parameters will, therefore, be considerably slower,
and a higher idle speed is initiated to try to
compensate at low engine speeds.
Needle Lift Sensor (X318)
The engine has six diesel fuel injectors, one of which
has a sensing element at the tip which informs the
ECM (Z132) exactly when the injector fires (the
`beginning of injection signal). The ECM (Z132) uses
this to correct the injection timing and also to back
up the engine speed signal in case that sensor fails.
If this sensor fails, the warning lamp will switch on
and the vehicle will enter `limp home mode with
reduced engine power/performance and lack of
throttle response (as there is a lack of feedback on
the injection timing).
Engine Coolant Temperature Sensor (X126)
This sensor is a `thermistor (a temperature
dependent resistor) where the voltage output varies
in proportion to coolant temperature. The ECM
(Z132) uses this information in many strategies, i.e.
to correct the injected fuel quantity and timing
(especially during cold starts), length of glow plug
timing, etc. The sensor is located in the top of the
engine block. In case of a failure, the warning lamp
is not activated and the ECM (Z132) selects a
substitute value of 50
C for glow plug and ignition
timing and uses the fuel temperature to correct the
fuel quantity, glow plug timing will not be correct,
possibly resulting in long crank times in cold weatheras well as slight fuelling effects. These symptoms
may not be noticeable.
Air Temperature Sensor (X311)
This sensor is another thermistor, located in the inlet
manifold, just after the intercooler, and measures the
actual temperature of the turbo booster air entering
the engine. To calculate the maximum amount of
injected fuel allowed, the ECM (Z132) needs to know
the volume of air flowing into the engine. Normally a
bulky, heavy and expensive air flow meter is
necessary, but the ECM (Z132) can calculate the air
flow from the air temperature and air pressure, so
eliminating the need for an air flow meter. If the air
temperature sensor fails, a substitute value of 30
C
is used, so by producing an incorrect air flow reading
and a reduction in engine power. 
						

							DIESELA6
CIRCUIT OPERATION2
Boost Pressure Sensor
The boost pressure sensor signal is used in
conjunction with the air temperature signal to
calculate volume air flow into the engine. The sensor
is located on the rear bulkhead, with the pressure
tap just after the charge air cooler. If the sensor fails,
a substitute value of 490 hPa is used by the ECM
(Z132), producing a reduction in power due to a fuel
quantity limiting to 21mg/stroke.
Throttle Position Sensor (X171)
The DDE system is a `Drive by Wire system i.e. the
throttle pedal does not directly control a throttle disc
or the amount of fuel injected into the engine, but
accelerator movements or `drivers request are
sensed and the information is passed to the ECM
(Z132). The ECM (Z132) calculates the maximum
allowable fuel quantity from the air flow into the
engine, engine speed, temperature, etc. It also
includes information from strategies such as smoke
limitation, active surge damping, automatic gear
change, fuel reduction, etc. to calculate the final
figure. When driving, if the `drivers request signal is
smaller than the maximum allowable quantity, then
the requested quantity is injected. However, if the
requested quantity is greater than the maximum
allowable, then the latter quantity is injected rather
than the drivers demand. Therefore the Throttle
Position Sensor (X171) is very important to the
system. It is located within the cab, close to the
pedal assembly itself. The unit consists of a
potentiometer and has three outputs:
1. Throttle Position ± pin 37 ECM (Z132)
The sensor outputs the pedal position to the ECM
(Z132), which uses the information as described
above.
2. Idle Position Switch ± pin 25 ECM (Z132).
The sensor has a separate idle position switch which
informs the ECM (Z132) of the pedal status in the
form of a simple on/off signal. This information is
used by the ECM (Z132) to implement 
idle speed
control and other strategies i.e. 
overrun fuel
shut±off.
3. Kick Down Switch.
This switch is currently not used.
Fuel Temperature Sensor
A thermistor is also located inside the injection
pump. The fuel temperature sensor signal is used to
adjust the quantity of injected fuel, especially during
temperature extremes. The signal is also used to
back up the Engine Coolant Temperature Sensor
(X126). If this sensor fails, the ECM (Z132) uses asubstitute value of 60C and only slight effects on
fuelling may possibly be noted.
Fuel Quantity Feedback Sensor
Located within the injection pump, this sensor sends
the ECM (Z132) information regarding the actual
quantity of fuel injected. Failure of the sensor or
corrupted signals will illuminate the warning lamp
and cause the engine to stall or not start. A second
check, a plausibility check against the needle lift
sensor, also takes place. 
						

							DIESELA6
CIRCUIT OPERATION3
Fuel Quantity Actuator
Once again located within the injection pump, this is
a moving magnet actuator, failure of which will cause
the engine to stall or not start as the ECM (Z132) will
activate the Fuel Shut±Off Solenoid (K111).
Injection Timing (Solenoid Valve Injection Timing
Device (K229))
This is another actuator within the injection pump.
The ECM (Z132) receives a signal from the needle
lift sensor and attempts to correct the injection timing
accordingly. If a change does not occur, then the
ECM (Z132) assumes a fault exists, activates the
warning lamp and reduces the quantity of injected
fuel.
Fuel Shut±Off Solenoid (K111)
The Fuel Shut±Off Solenoid (K111) shuts the engine
down if the ECM (Z132) detects a major fault.
Failure of the valve itself does not activate the
warning lamp, although if a short circuit occurs, the
engine will shut down.
Cruise Control
Due to the DDE system being 
drive by wire, a
cruise control feature is supplied in the ECM (Z132)
itself. Activation is via the steering wheel switches to
a converter box and on a single line to the ECM
(Z132). Failure of the signal results in cruise control
not working.
Brake Switches
The ECM (Z132) has two brake inputs, each of
opposite polarity. Comparison of the polarity states
provides the ECM (Z132) with a brake sense (i.e. if
switch 1 high and switch 2 low going to switch 1 low
and switch 2 high) and so cancels cruise control. If
both switches are the same polarity, the ECM (Z132)
senses a fault and does not allow cruise control.
Vehicle Speed Signal
The ECM (Z132) takes this signal from the
Anti±Lock Brake System ECU (Z108) and uses the
information for cruise control and 
active surge
damping. Failure of the signal results in cruise
disallowed and temporary lack of surge damping (i.e.
hard acceleration will cause the vehicle to surge
slightly). After 10 sec. a substitute value of 150 km/his used. Surging will reduce so as to be hardly
noticeable.
Theft Alarm
The ECM (Z132) has a simple on/off input regarding
the theft alarm. The ECM (Z132) will not allow the
engine to start once activated and will kill the engine
if activated up to 300 RPM (programmable). Over
300 RPM, the engine is unaffected.
Relays
The DDE engine management system on the diesel
vehicles uses four relays:
ECM (Z132) power supply (main relay), glow plug
relay, starter motor relay and fuel pump relay. Two
are located in the fuse box and two in the ECM
(Z132) box behind the battery.