Ignition Coil: Testing and Inspection

Description:

Description:

SPARK TEST
1. Disconnect the coil wire from the distributor.
2. Hold it with insulated pliers 0.20 - 0.40 in (5 - 10 mm) from a ground.
3. Crank the engine and verify that a strong blue spark is visible.
4. If there is no spark, disconnect the connector from the ignition coil and check for voltage at the positive (+) terminal of the connector with the ignition switch in the ON position.

Voltage: Approximately 12V

5. If there is no voltage, check the MAIN fuse, ignition switch, and wire harness.

Description:

PRIMARY COIL WINDING
1. Use an ohmmeter and measure resistance of the primary coil winding (Pin 1 - YEL/WHT to Pin 2 - BLK/WHT). If not within specification, replace the coil.

Primary coil resistance: 0.81 - 0.99 ohms (at 68°F [20°C])

NOTE:The image for this test can be misleading as it appears to show the meter connected to the coil wire. This is not the case, the wire the meter is connected to is actually the wire harness that connects to the coil as mentioned in the procedure.

Description:

SECONDARY COIL WINDING
1. Use an ohmmeter and measure resistance of the secondary coil winding (Pin 2- BLK/WHT to high voltage output terminal). if not within specification, replace the coil.

Secondary coil resistance: 10 - 16 K ohms (at 68°F [20°C])

Description:

CASE INSULATION
1. Use a 500V megohm tester to measure the insulation resistance between each terminal and ground. Verify that both connectors to the primary coil are disconnected before testing.

SPECIFICATION: 10 M ohms minimum