Service manual

90-898303
4-16
Ignition Coil
Each module contains an ignition coil and amplifier circuitry which produces
approximately 50,000 volts at the spark plugs.
DDT TEST
1. Operate the Data Monitor function using the DDT and record the data.
2. Check the Fault Status using the DDT and record the data.
3. Connect the Digital Diagnostic Terminal (DDT) to the diagnostic port
location on the engine.
4. Perform an ignition load test on the cylinder associated to the coil. Refer to
the Digital Diagnostic Terminal Technicians Reference Manual for help.
NOTE: This test can also be performed using the Computer Diagnostic
System (CDS). Refer to the “Active Diagnostics” section within the CDS
application.
RESISTANCE TEST
1. Disconnect the plug end and the harness connector from the coil being
tested.
2. Visually inspect the pins at the coil and the wires coming from the
connector. Look for broken, bent, or corroded pins at the coil and loose,
broken, or corroded wires at the connector. Replace components as
necessary.
3. Perform a resistance test on the coil. If the coil fails this test, replace the
coil.
NOTE: Refer to appropriate service manual for test procedure and
specifications.
Notes
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