BLADE AS-WIPER 8Y4615 - Caterpillar

Note: This section contains some general information about the engine electronic system and sensors. For more information, see the following publications:
Systems Operation/Testing and Adjusting, SENR6412, "G3500 Engines"
Specifications, SENR6417, "G3500 Engine Attachments"
Systems Operation/Testing and Adjusting, SENR6418, "G3500 Engine Attachments"
Electronic Troubleshooting, SENR6413, "G3500 Engines"Electronic Ignition System (EIS)
The Caterpillar Electronic Ignition System was designed to replace the type of ignition system that has a magneto. The following benefits are the most significant advantages of the electronic ignition system:
Addition of more extensive system diagnostics
Elimination of parts that are prone to mechanical wear
Precise control of ignition timingThe electronic ignition system provides control for the following activities:
Diagnostics of the engine control system
Ignition timing
Protection from detonationIf operating parameters are outside of acceptable limits, the electronic ignition system provides warnings. The system may inhibit the engine operation or may shut down the engine. Also, the system can display some of the operating parameters of the engine.The electronic ignition system includes the following components:
Detonation sensors
EIS control module
Engine speed/timing sensor
Ignition harness
Manifold air pressure sensor
Sensor harnesses
Spark plugs
TransformersControl of the Electronic Ignition System
Illustration 1 g00309805
EIS control module
The EIS control module is a sealed unit with no serviceable parts. Sensors are used in order to monitor engine operation. Wiring harnesses connect the sensors to the control module. The module uses information from the sensors in order to determine the ignition timing. The information is also used to provide diagnostics.Note: On newer engines, there is a small door on the front face of the control module. Replace the computer chip inside the control module if updates or special modifications are required.The primary ignition wiring is routed through the engine block. Ignition timing is based on the following variables:
Map of ignition timing that is desired
Engine parametersThe operator can use an electronic service tool to change the following parameters:
Desired timing
Map of speed and timingThe EIS control module has outputs to each ignition transformer. The module also uses sensors and internal circuitry to monitor the system components. If a problem develops in a component or a wiring harness, the control module will sense the problem. The control module will notify the operator by creating a diagnostic code.Ignition Transformers
Each cylinder has an ignition transformer that is located under the valve cover. To initiate combustion in each cylinder, the engine control module sends a pulse to the primary coil of the ignition transformer. The transformer increases the voltage which creates a spark across the spark plug electrode.For the electronic ignition system, the transformers are grounded through the valve cover. Use caution when a valve cover is removed.Always disconnect the ignition harness from the transformer when a valve cover is removed.An ignition harness connects each transformer to the engine control module. The harness is routed inside the engine along the camshaft.Junction Box
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(1) Junction box
(2) Emergency stop button Junction box (1) contains these components:
Gauges
Meters
Indicators
SwitchesThe junction box also contains the electrical terminal strips that connect the sensors, pickups, and relays to the gauges. In addition, the junction box provides shutoff protection for the engine.Emergency stop button (2) is mounted on