September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Ignition Coil Resistance Check
- Turn ignition switch "OFF". Using an ohmmeter set at the low scale, attach leads to ignition coil primary terminals 1 and 15 (wires removed). See Fig 1. Take primary resistance reading.
Courtesy of NOT AVAILABLE
- On Mercedes-Benz models, the coil has a pressure relief plug located on top of the coil. Make sure the plug has not popped out. If it has popped out, replace coil.
- Set ohmmeter to x1000 scale, then connect ohmmeter leads to negative terminal 1 and coil tower terminal 4 (high tension). Take secondary resistance reading. If either the primary or the secondary reading was not within specifications, replace coil.
Ignition Coil Resistance Specification
| Application |
Primary |
Secondary |
| BMW |
.4 |
|
| Fiat Strada & X1/9 |
1.1-1.7 |
6000-10, 000 |
| Mercedes-Benz |
.7 |
8000-11, 000 |
| Porsch |
.33-.46 |
7000-12, 000 |
| Saab |
1.05-1.35 |
5500-8500 |
| Volvo |
1.0-2.0 |
|