E8A Checking the Control Module Input Signals
E8A Checking the control module input signals1 Unplug the control module connector. Remove the cover from the connector. Disconnect the Hall sensor lead.
2 Switch on the ignition.
Check whether voltage is present on pin 18 (green/white; GR/VT) of the control module connector.
If it is not, check the lead running from pin 18 (green/white; GR/VT) of the control module connector to the fuse box via the 6-pin connector and distribution terminal. Also check that the fuse is intact.
3 Connect the jumper lead with crocodile clips between pin 21 of the control module and ground. Check for voltage on pin 9 of the control module. If there is no voltage, check the yellow/white (GL/VT) lead between pin 21 of the control module and pin 85 of the main relay, and the brown/ white (BR/VT) lead between pin 9 of the control module and pin 87 of the main relay.
4 With the ignition switched on, check that voltage is present across pins 18 and 11 of the control module. If it is not, check the black (SV) lead running from pin 11 of the control module to one of the engine grounding points.
Control module connections, LH 2.2:
5 Connect the jumper lead with crocodile clips to pin 17 of the connector and ground.
With the ignition switched on, check for voltage on pins 87 and 87b of the fuel pump relay (or listen for the sound of the pump starting up). If no voltage is present, check the violet (VL) lead between pin 17 of the control module connector and pin 85 of the fuel pump relay.
6 With the ignition switched on, check whether voltage is present between pin 18 of the control module connector and pin 25 of the control module. If it is not, check the black/white (SV/VT) lead between pin 25 of the control module and one of the grounding points on the engine.
7 Plug in the distributor connector. Check for an ignition pulse on pin 1 of the control module by connecting a test lamp to ground and pin 1 of the control module connector. Switch on the ignition.
Model year 1985 and earlier cars:
The test lamp should light up weakly for about a second and then shine with a brighter light. If it does not, check the blue (BL) lead between pin 1 of the control module connector and terminal 1 on the ignition coil
Model year 1986 and later cars:
The test lamp should light up. If it does not, check the blue (BL) lead between pin 1 of the control module and the TD-O pin of the ignition pulse amplifier.
8 Use the multimeter to check other wiring functions (broken leads or corrosion) between the connecting pins of the control module.