KE-Motronic
The primary current flows to terminal 15 of the coil.
Through the primary winding of the ignition coil, voltage from its terminal 1 / - is supplied to the switch. To terminal (1) a tachometer is also connected.
A high voltage of about 25,000 V comes from the middle terminal 4 of the coil through the high voltage wire to the distributor cap.
The ignition coils for the engines in question differ in their technical data - do not confuse them! Coils are distinguished by green and gray stickers. In combination with the KE-Motronic system, another version of the ignition coil is installed.
Checked the ignition coils
The visual inspection of the coil has been described above.
To check the resistance, remove all wires from the ignition coil with the ignition off. The primary and secondary windings of the coil are measured.
Using an accurate ohmmeter, measure the resistance between terminals 1/- and 15/+ of the ignition coil.
Rated values:
- Coils with a green sticker: 0.52-0.76 ohms.
- All other coils: 0.6-0.8 ohm.
The following measurements are made between terminals 1 and 4.
Rated values:
- Coils with a gray sticker: 6.0-8.5 kOhm.
- Coils with a green sticker: 2.4-3.5 kOhm.
- KE-Motronic: 6.5-3.5 kOhm.
If these values are not reached, replace the ignition coil.
With these measurements, it is impossible to determine the short circuit between the windings. If suspicion falls on the ignition coil despite the correct measurement results, the coil should be checked in a workshop.
To check the voltage, you must have a charged battery.
Connect a voltmeter between ignition coil terminal 15 and ground.
Turn on the ignition.
The voltage must be at least 11.5 V.
Make the same measurement on the black wire of the switch.
If there is no voltage at all or it is too low, then the fault is in the wire to the ignition switch.
The wire plugs on the top of the ignition coil are labeled as follows:
1 Interrupt pulse from the switch.
4 High voltage.
15 Voltage supplied from clamp switch.
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