Rover 214 & 414 Service and Repair Manual - Rover club

5B•2 Ignition system – fuel injection engines
Crankshaft sensor
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ADU 7340
HT coil
Type:
SPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NEC 10002 or NEC 10003
MPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NEC 10002, NEC 10003 or NEC 10004
Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch, Ducellier or Rudi Cajavec
Current consumption - average . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winding resistances:
Primary:
0.25 to 0.75 amps @ idle speed
Spi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 to 0.5 ohms @ 20ºC
Mpi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 to 0.8 ohms @ 20ºC
Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 15 K ohms @ 20ºC
Torque wrench settings Nm lbf ft
Spark plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18
Distributor cap screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1
Distributor rotor arm grub screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7
Reluctor ring to flywheel setscrews . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2
Ignition HT coil mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5
Crankshaft sensor mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4
Crankshaft sensor lead-to-flywheel cover plate screw . . . . . . . . . . . . . 6 4
1 General information and
precautions
General information
The ignition system is fully electronic in
operation, incorporating an Electronic Control
Unit (mounted on the engine compartment
bulkhead), a distributor (driven off the inlet
camshaft left-hand end) and a crankshaft
sensor (mounted in the left-hand rear end of
the engine cylinder block/crankcase) which
registers with the reluctor ring fixed to the
flywheel. The system also incorporates spark
plugs, HT leads, an ignition HT coil and
associated wiring.
The system is divided into two circuits,
which are the primary (low tension/LT) and
secondary (high tension/HT) circuits. The
primary circuit consists of the battery, ignition
switch, ignition HT coil primary windings, ECU
and wiring. The secondary circuit consists of
the ignition HT coil secondary windings, the
distributor cap and rotor arm, the spark plugs
and the interconnecting HT leads.
The ECU controls both the ignition system
and the fuel injection system, integrating the
two in a complete engine management
system. Refer to Chapter 4 for information on
any part of the system not given in this
Chapter.
As far as the ignition system is concerned,
the ECU receives information in the form of
electrical impulses or signals from the
crankshaft sensor (which gives it the engine
speed and crankshaft position), from the
coolant temperature sensor (which gives it the
engine temperature), from the throttle pedal
switch (which tells it when the throttle is
closed) and from the manifold absolute
pressure sensor (which gives it the load on the
engine). All these signals are compared by the
ECU, using digital techniques, with set values
pre-programmed (mapped) into its memory.
Based on this information, the ECU selects
the ignition timing appropriate to those values
and controls the ignition HT coil accordingly.
This means that the distributor is just that, a
distributor of the HT pulse to the appropriate
spark plug. It has no effect whatsoever on the
ignition timing. Also, the system is so sensitive
that, at idle speed, the ignition timing may be
constantly changing. This should be
remembered if trying to check the ignition
timing.
Precautions
Refer to Part A of this Chapter.
2 Spark plugs - renewal
Refer to Chapter 1.
3 HT leads, distributor cap and
rotor arm - inspection and
renewal
1 Refer to Chapter 1. Note the anti-flash
shield fitted beneath the rotor arm.
4 HT coil - removal,
testing and refitting
1 Refer to Section 4 in Part A of this Chapter.
1689 Rover 214 & 414 Updated Version 09/97
5 Distributor -
removal and refitting 3
Removal
1 Disconnect the battery negative terminal.
2 Disconnect the HT leads from the spark
plugs.
3 Undo the two distributor cap retaining screws
and remove the cap and leads as an assembly.
4 Slacken and remove the grub screw
securing the rotor arm to the camshaft end
then pull off the rotor arm (see illustration).
5 Remove the distributor cap insulating plate
from the cylinder head.
6 Examine each components for signs of
wear or damage and renew as necessary.
Refitting
7 Refitting is a reverse of the removal
procedure. Tighten the rotor arm grub screw
and distributor cap screws to the specified
torque settings.
5.4 Distributor assembly
1 Distributor cap 3 Grub screw
2 Rotor arm 4 Insulating plate