Testing breakerless transistorized ignition

Conventional testers

Terminal 1 and ground

0.5-2.0 V

Voltage ignition coil

Terminal 15 and ground

approx. 4.5 V

Input voltage pre-resistor (series resistor)

approx. 12 V

primary terminal 1 and 15

0.33-0.46

secondary terminal 1 and 4

7-12

Transmitter resistance between terminal 7 and 31 d

600+ 100

Transmitter coil with control line terminal 7 and ground

approx. 1500 rpm

33-51

Dwell angle at

approx. 5000 rpm

45-55

) Perform dwell angle test at 5000 rpm only if complaints refer to misfiring at high speeds.

15.2 llb-562/1 F2

Wiring diagram breakerless transistorized ignition TSZ 4

1    Double cable connector

2    Switching unit

3    Pre-resistor 0.4 £1

4    Pre-resistor 0.6 £2

5    Ignition distributor with transmitter section

6    Ignition coil

a    Ignition switch terminal 15

b    Instrument cluster, revolution counter

c    Diagnosis socket

d    Terminal 16 starter

Color code br = brown ge = yellow

gn

rt

= green

= red

sw = black

In the event of complaints about misfiring, test high voltage side of ignition system first (spark plugs, ignition cable, spark plug connectors).

If the complaints refer to firing of engine, complete the following tests on ignition system in addition to tests at fuel end:

Visual checkup

Check electrical screw connections and plug connections of ignition system for tight seat.

15.2 llb-562/2 F2

Note: With the ignition switched on and the engine stopped a primary current of approx. 8 amps will flow continuously through system.

1 Input voltage at series resistor 0.4 Cable color black/red:

Rated value approx. 12 volts

2 Voltage at ignition coil at approx. 20 C:

Terminal 15 and ground = approx. 4.5 volts Terminal 1 and ground = 0.5—2.0 volts

a)   If value at terminal 1 is exceeded, the switching unit is defective and should be replaced.

b)  If value at terminal 1 is attained, but no ignition voltage (ignition spark) is induced, check trans­mitter section in ignition distributor and secondary winding of ignition coil.

Resistance values of ignition coil:

Primary winding terminal 15 and terminal 1 = 0.33-0.46 n .

Secondary winding terminal 1 and terminal 4 = 7-12

Note: The dwell angle cannot be adjusted. Testing is a functional inspection of switching unit (dwell angle control).

Connect dwell angle measuring unit (connection similar to SI standard switching unit).

Rated value at

Engine speed                       Dwell angle

1500±50/min                  33-51°

5000±50/min^!)              45-55

) Test at 5000/min only in the event of complaints about misfiring at high speeds.

If this value is not attained when measuring dwell angle, check ignition distributor transmitter section first. If transmitter section is in order, replace switching unit.

15.2 llb-562/3 F2

Pull control line of ignition distributor from switching unit and connect ohmmeter.

1 Check transmitter resistance between terminal 7 and 31 d.

Rated value: 600 ± 100ft

Note: On cold engine, the ohmic value should be in lower half of specified value, on warm engine in upper half.

2   Test transmitter coil including control line for ground connection between terminal and ground.

Rated value: °°

3   Check transmitter for mechanical damage. Check foi presence of air gap between rotor and stator.

Note: If the transmitter section is defective, replace complete ignition distributor.

Voltmeter, ohmmeter, dwell angle measuring instrument, revolution counter

Digital tester

e. g. made by Bosch, MOT 001.03

primary (terminal 1 and 15)

approx. 0.5—0.9 ft

Ignition coil

secondary (terminal 1 and 4)

6-16kft

Distributor cap

1 kft

Distributor rotor, spark plug connector

1 kft

Resistance of winding Ignition distributor transmitter section—————————–

600± 100ft

Resistance against ground

> 200 kft

15.2 llb-562/4 F2

Terminal 15 (jack 5 diagnosis socket)

Battery voltage

between terminal 15 and 1 (jack 5 and 4 diagnosis socket)

OVolt

Terminal TD at starting speed

from 7 ° to 25

Wiring diagram breakerless transistorized ignition without pre-resistors TS2 8 u

1     Line connector

2    Switching unit

3    Diagnosis socket

5    Ignition distributor

6    Ignition coil

7    Fuse box terminal 15

8    Ignition starter switch

b To fuel pump relay with rpm limitation

Color code br = brown ge = yellow gn = green rt = red sw = black

15.2 lib—562/5 F2

Test

Test voltage (terminal 15) against ground at jack 5 of diagnosis socket. Ignition switched on.

Nominal value: battery voltage

Nominal value correct.

Nominal value wrong.

Test voltage supply via ignition lock.

Test voltage difference between jack 5 and 4 (terminal 15 and 1) of diagnosis socket.

Nominal value: Ovolt

Nominal value correct.

Nominal value wrong (voltage >0.1 volt).

Switch off ignition immediately.

Replace switching unit.

15.2 llb-562/6 F2

Test plug in ignition coil and primary resistance of ignition coil (between terminal 1 and 15) 0.5-0.9 SI.

With plug ejected or wrong ohmic value, replace ignition coil.

End of test.

U5-3:1388

Test dwell angle at starting speed at diagnosis socket or terminal TD.

Nominal value: from 7—25°.

Nominal value correct.

Nominal value not indicated.

Nominal value higher than 34^C

Replace switching unit.

End of test

Test ignition distributor transmitter section for interruption and interturn short.

Pull off green control line on switching unit. Test resistance with ohmmeter between terminal 7 and 3.

Nominal value: 600 ± 100 £2

Nominal value correct.

Nominal value wrong.

15.2 llb-562/7 F2

Pull off plug connection of green cable on ignition distributor and test with ohm-meter at plugs whether 600 ± 100 O is indicated.

If nominal value is attained, replace green cable.

If nominal value is not attained, replace ignition distributor.

Test ignition distributor transmitter section for ground connection.

Pull off green cable on switching unit. Connect ohmmeter to terminal 3 or 7 and to ground.

Nominal value: > 200 kfi

Nominal value correct.

Nominal value wrong.

End of test

Pull off plug connection of green cable on ignition distributor. Test resistance against ground.

Nominal value at both plugs: = 200 ktu

If nominal value is not attained at one plug, replace ignition distributor.

15.2 Mb—562/8 F2