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| Illustration 1 | g01283511 |
Coolant monitoring circuit | |
The components of the coolant monitoring circuit are the Engine Electronic Control Module (Engine ECM), the Caterpillar Monitoring System ECM, the engine coolant temperature sensor, the coolant level sensor, and the gauge module.
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| Illustration 2 | g01259233 |
Left side view of engine (1) Engine ECM | |
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| Illustration 3 | g01261897 |
(2) Caterpillar Monitoring System ECM (behind display) (3) Engine coolant level alert indicator | |
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| Illustration 4 | g01261899 |
Right side view of engine (4) Engine coolant temperature sensor | |
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| Illustration 5 | g01261901 |
Front view of engine (5) Coolant level sensor | |
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| Illustration 6 | g01259235 |
Dash panel (6) Gauge module (7) Coolant temperature gauge | |
With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 7 to Caterpillar Monitoring System ECM (2). Power is supplied from the batteries via circuit breaker 6 to Engine ECM (1). Engine ECM (1) supplies 5 volt power to engine coolant temperature sensor (4) and to coolant level sensor (5) .
Engine coolant temperature sensor (4) sends a signal to Engine ECM (1). Engine ECM (1) sends a signal via the CAT Data Link to Caterpillar Monitoring System ECM (2). Caterpillar Monitoring System ECM (2) sends a signal to gauge module (6). Gauge module (6) indicates the engine coolant temperature on coolant temperature gauge (7) .
Coolant level sensor (5) sends a signal to Engine ECM (1). Engine ECM (1) monitors the state of the coolant. Engine ECM (1) sends the coolant level condition to Caterpillar Monitoring System ECM (2). Engine coolant level indicator (3) will illuminate if the coolant level is not within specification. If coolant level sensor (5) is out of range for the engine requirements, Engine ECM (1) will begin timing the condition. Engine ECM (1) monitors the condition of coolant level sensor (5) and will derate the engine or shut the engine down depending on the severity of the conditions.