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| Illustration 1 | g00447290 |
For coolant temperatures less than 60°C (140°F), engine idle speed is raised to 1300 RPM. Between 60°C (140°F) and 70°C (158°F), the engine idle speed is a linear function from 1300 RPM to 1000 RPM. For coolant temperatures that are greater than 70°C (158°F), the elevated idle is disabled. When the elevated idle is disabled, the engine speed returns to 700 rpm.
Elevated idle is enabled only when the transmission is in the NEUTRAL position and the parking brake is in the ON position.
The activation of the elevated idle is delayed at the engine start-up and at the engine cooldown. The activation of the elevated idle is delayed for 10 minutes after all the conditions have been met. Depressing the throttle for more than 25% of the travel will reset the timer with another 10 minutes. The engine idle speed will drop to 700 rpm.
Cylinder Cutout Test
During start-up, the Electronic Control Module (ECM) performs the cylinder cutout test. The cylinder cutout test provides a way for the ECM to perform the following functions:
- The reduction of the output of white smoke during a cold start-up
- The minimizing of the time that is spent in cold mode
- The reduction of the use of ether injection
During a cold start-up and periods of extended time at low idle, the ECM automatically turns off one electronic unit injector at a time. The ECM checks the rack in order to determine if the cylinder is firing. If the cylinder is firing, the ECM turns on the electronic unit injector. If the cylinder is not firing, the electronic unit injector will remain disengaged. This reduces the white smoke that is caused by unburned fuel.
Note: During the cylinder cutout test, the engine may seem to misfire. This does not indicate the need for any type of engine repair.
The following conditions are required in order to activate the cylinder cutout test.
- The parking brake is engaged.
- The transmission is in NEUTRAL .
- The ground speed of the machine is zero.
- The jacket water temperature is below 63°C (145°F) .
Note: The cylinder cutout test is activated after the following conditions exist:ten seconds after the engine starts, three seconds after the automatic ether injection is completed, reaching the idle speed and satisfying the above conditions. The cylinder cutout test will also activate after ten minutes of idling if the same conditions are met.
The following conditions will deactivate the cylinder cutout test:
- The parking brakes are disengaged.
- The throttle pedal is depressed by more than 25 percent of the pedal's travel.
- The transmission is in gear.
- The ground speed of the machine is above zero.
- The jacket water temperature is above 70°C (158°F) .
- The cutoff of the ECAP or of the ET'S service tool is activated.
- The manual ether switch is held.
Note: The cylinder cutout test will deactivate if the engine speed is at low idle for ten seconds and the engine speed falls below low idle by more than 100 rpm.