14-12 Rover MEMS -MPi/SPi
STEPPER MOTOR
FUEL PUMP OXYGEN CFSV
14.16 Typical local wiring diagram: relays (MFU)and components
- - -- - --- --
Testing the MFU
3 Ignitionkey on, relayconnected.
4 Backprobe or probe for voltages at
components supplied by the relay. Ifthere is
no output, backprobe at the appropriate MFU
output terminal. Ifthere is still no output, and
all supply and earth voltages are satisfactory,
the MFUis suspect (see illustrations 14.16
to 14.18).
5 Ifone of the MFUrelays is judged faulty,the
MFUmust be renewed complete.
MULTI
FUNCTION
UNIT
812
EARTH
STARTER SOLENOID
- - ---
I 28 Fuelpump andcircuit
---- - - - -
~
14.17 Multi-function unit (MFU)
1 Refer to the notes at the start of Section 11,
and refer to the relevant Section of Chapter 4.
--- --
29 Fuel pressure
- --- ----
1 Refer to the notes at the start of Section 11,
and refer to the relevant Section of Chapter 4.
14.18
MFU multi-plug
30 Oxygen sensor (OS)
- -- - - --- - --- - - - -
1 Refer to the notes at the start of Section 11,
and refer to the relevant Section of Chapter 4.
2 The OS found in the majority of Rover
MEMS systems is a four-wire sensor with a
heater.
31 Carbon filtersolenoid valve
(CFSV)
-- --- --
1 Refer to the notes at the start of Section 11,
and refer to the relevant Section of Chapter 4.
Pin table -typical 36-pin/18-pin
Note: Refer to illustration 14.19.
Terminal 'A'
1 Injector cylinder 4
2 Stepper motor phase 2
3 Stepper motor phase 1
4 Main relay driver
5 -
6 -
7 Oxygen sensor signal
8 TPSsignal
9 TPSsupply
10 Diagnostics output
11 Ignition switch supply
12 -
13 -
14 Earth
15 Diagnostics input
16 ATS
17 KS
18 Oxygen sensor return
19 AC magnetic clutch relay
20 Fuel pump relay driver
21 CFSV
22 Stepper phase 3
23 Injector pulse cyl 2
24 Injector pulse cyl1
25 Ignition coil
26 Injector pulse cyl 3
27 Stepper motor phase 4
28 Supply from main relay
29 ECM earth
30 Sensor return
31 CAS +
32 CAS return
33 CTS
34 FRTS
35 AC high press safety sw
36 Oxygen sensor relay driver
Terminal'S'
3 Alternator
5 OS relay driver
6 Turbo boost valve
8 Turbo air pressure solenoid
13 OS return
14 OS signal
15 Camshaft sensor
18 Camshaft sensor
