WASHER 1T0689 - Caterpillar

Conditions Which Generate This Code:The transformer's secondary circuit is generating excessive radiated noise. This condition is detected by the software in the control module for the Electronic Ignition System (EIS).System Response:The system's response depends on the software. If the date code for the EIS software is earlier than October 1994, the warning output is activated. If the date code for the EIS software is later than September 1994, the shutdown output is activated.The diagnostic code may be viewed on the Digital Diagnostic Tool (DDT) or on the Caterpillar Electronic Technician (ET).If the date code for the EIS software is earlier than October 1994, the cylinder may misfire.If the date code for the EIS software is later than September 1994, the engine will be shut down.One of the following conditions is the source of the diagnostic code:
A faulty spark plug
There is a problem with the electrical connection between the spark plug and the transformer.
Excessive carbon buildup on the spark plug or inside the transformer's extenderTest Step 1. Perform the following diagnostic procedure: Ignition Transformers Secondary Circuit and Spark PlugsResults:
OK - STOP