Examination
Disconnect the connector of the wires coming from the switch to the distribution sensor.
Connect a voltmeter with a division value of 0.1 V.
Start the engine with a starter: if the voltmeter shows at least 0.05 V, the pulse generator is OK and the switch is the cause of the malfunction.
Replacement
Disconnect the plug connector of the pulse generator and remove the ignition distributor.
Remove the vacuum regulator from the sensor-distributor housing by first unscrewing the fastening screws and shifting the connecting rod down.
Remove the circlip and washer.
Insert two screwdrivers on opposite sides of the tab shield and carefully pry it out. being careful not to damage the mounting pin.
Remove the thrust washer, remove the three hex socket head cap screws and remove the circlip.
Remove bracket 2 by unscrewing locking screw 1.
Disconnect block 3, then remove the carrier disk by unscrewing the locking screws.
Roll the pulse generator off the carrier disk.
Screw the new pulse generator onto the carrier disk, guiding the spade leads of the generator towards the notch on the carrier disk.
Insert the carrier disk into the housing of the distributor sensor. Attach the block. Tighten the locking screw 1 of the bracket 2.
Install retaining ring. Tighten the three hex cap screws. Install thrust washer.
Install the projection screen; in this case, the cutout on the screen must coincide with the groove on the drive shaft of the sensor-distributor.
Check the gap between the projections of the screen and the contacts of the stator of the pulse generator, which should be within 0.35-0.70 mm.
Install the cup washer and retaining ring.
Install the vacuum regulator by attaching the connecting rod to the distributor sensor shaft, after lubricating it with engine oil.