CONTROL GP-ENGINE ELECTRONIC 1964170 - Caterpillar

Test
When the ignition switch is turned to the "RUN" position, the control module energizes the magnetic switch, supplying the heater element with power for two seconds. The indicator lamp in the instrument panel should illuminate at that time. Failure of the lamp to illuminate indicates a system or lamp malfunction. If the coolant temperature is below the lower limit of the temperature switch, the system should go directly from the lamp test into the pre-heat cycle (light will not turn off).Pre-Heat Cycle
Three conditions must exist before the air inlet heater will operate in the pre-heat cycle: 1. The ignition switch must be in the "RUN" position or the key switch in the "ON" position.2. The coolant temperature is below the lower limit of the temperature switch.3. The air inlet heater has not timed out for thirty seconds in the pre-heat cycle.There are three ways to end the pre-heat cycle: 1. The ignition switch is turned to the "START" position or the start button is pressed.2. The ignition switch is turned to the "OFF" position.3. The system reaches the thirty second time limit.Crank Heat Cycle
Three conditions must exist before the air inlet heater will operate in the crank heat cycle: 1. The ignition switch is in the "START" or "ON" position, or the start button is pressed.2. The coolant temperature is below the lower limit of the temperature switch.3. The air inlet heater has not timed out for thirty seconds in the pre-heat cycle. The thirty second timer starts when the ignition switch is turned to the "START" or "ON" position, or the start button is pressed and continues with the engine not running. It is continually reset as long as the ignition remains in the "START" or "ON" position.There are three ways to end the crank heat cycle: 1. The ignition switch is turned to the "OFF" position.2. The engine starts.3. The system reaches the thirty second time limit with the ignition in the "RUN" position and the engine not operating. Crank heat will resume when the engine is returned to the "START" position.Regular Heat Cycle
Four conditions must exist before the air inlet heater will operate in the regular heat cycle: 1. The ignition switch must be in the "RUN" or "ON" position.2. The coolant temperature is below the upper limit of the temperature switch.3. The engine oil pressure is above 240 70 kPa (35 10 psi).4. The air inlet heater has not timed out for five minutes in the regular heat cycle plus fifteen minutes of cycling ten seconds "ON" and ten seconds "OFF".There are four ways to end the regular heat cycle: 1. The ignition switch is turned to the "OFF" position. When the switch is turned to the "OFF" position, the regular heat cycle is terminated.2. The engine stalls.3. The coolant temperature exceeds the upper limit of the temperature switch.4. The system reaches its twenty minute time limit.
Air Inlet Heater Electrical Schematic (Typical Example)
Air Inlet Heater Controller Functional Flow ChartCooling System
3116 Heat Exchanger