Ignition Coil Test

Fig.18 Terminal Identification:

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

1. Remove the ignition cables and measure the resistance of the cables. Resistance must be between ranges shown. Replace any cable not within tolerance.

Secondary Ignition Cable Resistance
Minimum Maximum
Cables #1 & #4 3,500 Ohms 4,900 Ohms
Cables #2 & #3 2,950 Ohms 4,100 Ohms

2. Disconnect the electrical connector from the coil pack.

3. 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. Replace the coil if resistance is not within tolerance.

Fig.19 Checking Ignition Coil Secondary Resistance:

4. 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 @ 21-27°C (70-80°F) = 7,000 to 15,800 ohms.
- Replace the coil if resistance is not within tolerance.