CHAIN-BEAD 8T9304 - Caterpillar

engine uses a strategy for the cold cylinder cutout to reduce white exhaust smoke after start-up and during extended idling in cold weather.During a cold start and/or extended periods at low idle, the engine's Electronic Control Module (ECM) turns off one unit injector at a time to determine if each cylinder is firing by monitoring the change in the fuel rack. If a cylinder is firing, the ECM turns on the injector. If a cylinder is not firing, the injector is turned off. This cold cylinder cutout provides the following benefits: reduction of white smoke, improved engine starting, reduction in the use of ether injection and reduction of warmup time.Note: During operation of the cold cylinder cutout, the engine may seem to misfire. This is normal. No corrective measures are necessary.The cold cylinder cutout is activated after all the following conditions are met:
The cold cylinder cutout is programmed to ENABLE.
The engine speed is equal to high idle or below high idle.
The fuel rack is less than 13 mm (0.50 inch).
The jacket water coolant temperature is below 63 °C (145 °F).The cold cylinder cutout strategy is activated 10 seconds after the engine starts and the engine reaches idle speed or 3 seconds after ether injection is completed.The cold cylinder cutout is deactivated if any of the following conditions are met:
The cold cylinder cutout is disabled with the Cat® Electronic Technician (ET).
The jacket water coolant temperature rises above 70 °C (158 °F).
The cylinder cutout test is activated.
The ether injection is used.
The coolant temperature sensor has failed.If the fuel rack is greater than 13 mm (0.50 inch), the cold cylinder cutout deactivates for 3 seconds.The cold cylinder cutout will deactivate for 3 seconds when the engine speed varies by more than 50 rpm as the cold cylinder cutout begins. A new engine speed is established when the cold cylinder cutout reactivates.The cold cylinder cutout deactivates for 30 seconds when the engine speed is at low idle for 10 seconds and the engine speed falls by more than 50 rpm below low idle.