EIS Control Module
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| Illustration 1 | g00824410 |
EIS control module | |
The EIS control module activates warnings and shutdowns for the following types of conditions:
- Electrical system malfunctions
- Excessive detonation
- Incorrect programming
The Caterpillar Electronic Technician (Cat ET) or the Digital Diagnostic Tool (DDT) can also be used to monitor some parameters of the EIS control module.
Note: Cat ET can only be used with EIS control modules that were produced after February 1996.
The EIS control module is self-diagnostic. If a problem with the system is detected, the EIS control module can activate a warning or a shutdown. If this occurs, a diagnostic code is issued in order to inform the operator of the specific problem. The diagnostic code can be read with Cat ET or with the DDT.
For a complete list of the warnings, shutdowns, and corresponding diagnostic codes, refer to the engine's Electronic Troubleshooting manual.
Junction Box
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| Illustration 2 | g00820755 |
Inside of a typical junction box (1) Terminal strip (2) Wiring to the emergency stop button on the door (3) Electronic service tool connector (4) Circuit breaker | |
The junction box contains terminal strips (1) for connections from the engine harness. Wiring (2) is for the emergency stop switch on the outside of the door for the junction box. Electronic service tool connector (3) is for use with Cat ET or with the DDT. Circuit breaker (4) helps protect the electrical system from power surges.
Two basic electrical systems are available to provide engine protection: energize-to-run and energize-to-shutoff. Protection from low oil pressure, high coolant temperature, and engine overspeed is provided. Both systems are capable of activating a gas shutoff valve and of controlling the ignition system. An external power source of 24 volts is required for these systems.
Electronic Service Tools
The electronic service tools will display diagnostic codes that are generated by the EIS control module. The electronic service tools can also be used to display the status of the following parameters during engine operation:
- Actual engine rpm
- Actual degrees of ignition timing before top center and the programmed desired ignition timing
- Level of detonation
- Inlet manifold air pressure
For information on using Cat ET, refer to the User's Manual that is provided with the software.
For information on using the DDT, refer to Tool Operating Manual, SEHS8806.