VALVE-EXHAUST 1196772 - Caterpillar

System Operation Description:The output for the warning lamp indicates that the control module for the Electronic Ignition System (EIS) has detected a condition that requires the notification of the operator. Typically, this output is connected to a yellow lamp.When the control module is retarding the timing due to detonation, the control module activates this output continuously. When the control module detects a warning condition, this output is pulsed. The control module can sink a maximum of 200 mA of current through this output. A flyback diode is included in the internal circuit. The diode protects the module from voltage spikes that can occur when a relay is activated.The device that is connected to this output can be an indicator lamp or the coil of a relay. The other side of the output device must be connected to the +Battery.The output is protected against a short circuit to the +Battery and to the −Battery. If the output circuit has a fault, the engine will continue to run. The control module monitors the output for these faults:An Open Circuit - The control module detects this fault when the engine is running and when the engine is not running. The output device will not activate. A 324-05 diagnostic code will be generated.Short to −Battery - The control module detects this fault when the engine is running and when the engine is not running. The output device is always activated. A 324-05 diagnostic code will be generated.Short to +Battery - The control module detects this fault only when the module activates the output. The current flow through the circuit will be limited to 200 mA. The output device will not activate. A 324-03 diagnostic code will be generated.The most likely cause of a faulty circuit is a problem with the wiring. The next likely cause is a problem with the output device. The least likely cause is a problem with the EIS control module.
Illustration 1 g01045652
Schematic diagram of the output for the warning lampThe engine is equipped with a remote control panel that includes a status control module.
Illustration 2 g01045653
Schematic diagram of the output for the warning lampThe engine is configured for Canadian Standards Association (CSA).Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
EIS connectors on the control module
Connections for the equipment that is connected to the output for the warning lamp
Illustration 3 g01047061
Harness side of the EIS connector (EISC-C) Output for the warning lamp
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the output for the warning lamp.
Check the terminal strips for corrosion and for mechanical failure.
If the engine is equipped for CSA, check the harnesses and the wiring for abrasion and for pinch points between the device that is connected to the output and the control module.Expected Result:The connectors, pins, and sockets are connected