Coil Check

Fig 18 Ignition Coil Terminal Identification:

NOTE: Coil 1 fires cylinders 1 and 4, coil 2 fires cylinders 2 and 5, and coil 3 fires cylinders 3 and 6. Each coil tower is labeled with the number of the corresponding cylinder.

1. Disconnect the electrical connector from the coil pack.
2. Measure the primary resistance of each coil. At the coil, connect an ohmmeter between the B+ pin and the pin corresponding to the cylinders in question (Fig. 18).
- Resistance on the primary side of each coil should be 0.45 - 0.65 ohm at 21° to 27° C (70° to 80°F).
- A coil that has not been allowed to cool off, would result in inaccurate measurement results.
- Replace the coil if resistance is not within tolerance.

Fig 19 Checking Ignition Coil Secondary Resistance:

3. Remove ignition cables from the secondary towers of the coil. Measure the secondary resistance of the coil between the towers of each individual coil (Fig 19).
- Secondary resistance should be 7,000 to 15,800 ohms.
- Replace the coil if resistance is not within tolerance.