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. Set ohmmeter to x1000 scale, then connect ohmmeter leads to negative terminal 1 and coil tower terminal 4. Take secondary resistance reading. If not within specifications, replace ignition coil.
Fig 1: Ohmmeter Hookup for Ignition Coil Primary and Secondary Resistance Checks and for Resistor Resistance Check
Ignition Coil Resistance Specifications (Ohms)
| Application | Primary | Secondary | |
|---|---|---|---|
| BMW | .4 | ..... | |
| Fiat Strada & X1/9 | 1.1-1.7 | 6, 000-10, 000 | |
| Mercedes-Benz | .38-.42 | 8, 000-11, 000 | |
| Peugeot 604 | .33-.46 | 7, 000-12, 000 | |
| Porsche | |||
| 924 | 1.0-1.35 | 5, 500-8, 000 | |
| 928 | .33-.46 | 7, 000-12, 000 | |
| Saab | 1.05-1.35 | 5, 500-8, 500 | |
| Volvo | 1.0-2.0 | ..... | |