W/Tach and TIS : T16 Lambda

Ignition System Components:

Ignition System Diagrams:

Locations of components

1 Battery
On the left-hand side of the engine compartment

3 Earthing point, facia
At the left-hand front speaker socket

4 Starter motor
On the rear of the engine, below the intake manifold

5 Ignition coil
On the radiator

6 Ignition distributor
On the left-hand corner of the engine 7 Earthing point, wheel housing

8 Lighting relay
In the electrical distribution box behind the glove compartment

20 Ignition switch
On the right-hand side of the steering column

21 Ignition switch relay
In the electrical distribution box behind the glove compartment

22A Fuse board
Behind the access panel in the glove compartment

67 Six-pole connector
In the engine compartment, at the windscreen wiper motor

73 Timing service instrument (TSI) socket
On the left-hand side of the engine compartment, at the bulkhead

75 Distribution block
Forward of the battery

110 Tachometer
In the combined instrument on the facia

113 Relay/time-delay relay for the rear window heater
In the electrical distribution box behind the glove compartment

146 Amplifier for the electronic ignition system
On the left-hand wheel housing, at the battery

147 Ignition pulse amplifier
In the electrical distribution box behind the glove compartment

155 Relay for the AC and ACC radiator fan

156 Time-delay relay for the AC and ACC radiator fan

157 Spark plugs
On the top of the engine, under the cover

158 Negative distribution terminal
In the electrical distribution box behind the glove compartment

159 Distribution terminal +15
In the electrical distribution box behind the glove compartment

211 Earthing point
On the gearbox

342A Fuse board
In the electrical distribution box in the engine compartment, behind the left-hand headlamp

Operation
The ignition system is breakerless and is equipped with a Hall sensor.

The ignition system will not be energized until ignition switch 20 is in the drive or start position. A positive voltage will then be supplied to ignition coil 5 and amplifier 146. Terminal 2 of the unit is earthed.

Firing signals will be applied from a Hall sensor in distributor 6 to the amplifier, at a rate corresponding to the speed of rotation of the engine.

The signal which opens the primary circuit of the ignition coil is amplified and adapted in the amplifier, and a high-tension pulse will then be generated. The high-tension pulse is then applied to the appropriate spark plug, across the distributor.

Ignition pulse amplifier 147 is included to ensure more reliable control of ignition pulse-dependent systems, such as the fuel system and the APC system.

Ignition pulses are supplied from terminal 7 of amplifier 146 to input TD-J on the ignition pulse amplifier. Amplifier output TD-0 supplies a "pure" 12V square-wave signal to timing service instrument socket 73 and to tachometer 110 (and also to the other ignition pulse-dependent systems).

Timing service instrument TSI socket 73 is intended for a special instrument and has the following terminals:

1. Positive supply directly from the battery, across distribution block 75.
2. Earth.
3. Solenoid (terminal 50) of starter motor 4.
4 Positive supply when the ignition switch is in the drive position (across fuse 13).
5. Ignition pulses from amplifier 146 (via ignition pulse amplifier 147).
6. Not used.

The supply to tachometer 110 is taken across fuse 13. The pulses it needs for showing the engine speed are obtained from the ignition pulse amplifier.

Fault-tracing hints
The ignition system will be energized when ignition switch 20 is in the drive position.

1. Check that terminal 15 on the ignition coil and terminal 4 of amplifier 146 are live.
2. Check that ignition pulse amplifier 147 is live.
3. Check fuse 13 and check that the supply to this fuse is live.
4. Check that terminal 4 of tachometer 110 and terminal 4 of timing service instrument socket 73 are live.
5. Check the connectors, wiring and earth connections.