Idle Shutdown (with RPO CTF)
This feature automatically shuts down the engine after it idles continuously for five minutes and if the following conditions are met:
| • | The parking brake is set. |
| • | The vehicle is at a complete stop. |
| • | The automatic transmission is in NEUTRAL (N) or PARK (P). |
If the parking brake is not engaged, the engine shuts down after 15 minutes of continuous idling operation. The driver can reset the engine shutdown timer by momentarily changing the position of the accelerator, brake, or clutch pedal or by shifting
the transmission out of PARK (P) or NEUTRAL (N). Once reset, the engine idle shutdown will restart the shutdown sequence described above, and will continue to do so until the engine shuts down or the vehicle is driven. The engine will not go into idle shutdown
mode if:
| • | The power take-off (PTO) equipment is operating. |
| • | The engine coolant temperature is below 15°C (60° F). The engine idle shutdown will be activated once the vehicle coolant reaches 15°C (60°F) or above. |
| • | The diesel particulate filter (DPF) is in regeneration mode and the green DPF lamp is illuminated to notify the driver that DPF is regenerating. The engine idle shutdown mode will be overridden for the time necessary to complete the regeneration
process, up to a maximum of 30 minutes. |
| • | Service or maintenance is being performed on the engine. The engine idle shutdown mode can be deactivated by establishing communication with the vehicle through scan tool. A communication link is established by selecting any data list. Once the scan
tool is disconnected from the vehicle, the engine idle shutdown feature will resume normal operation. |
The engine shutdown warning light and chime will stay ON for the entire duration of the idle shutdown event to inform the driver that the engine is in idle shutdown mode. After the engine shutdown occurs, the engine is no longer running, and the ignition
is still in the ON/Run position, all accessories can be used. Turn the ignition switch to START to restart the engine, or turn it to LOCK/OFF to prevent the battery from draining.
High Idle Switch
The high idle switch will slowly increase engine RPM to the calibrated high idle speed when depressed. The high idle speed can be programmed by using a scan tool. Refer to
High Idle Switch Programming. If the High
Idle Switch is not operating as desired, refer to
High Idle Switch Diagnosis.
Manual High Idle
The diesel engine has a high idle system to improve the warm-up time of the engine in cold weather conditions. This system allows the engine control module (ECM) to increase the idle speed above the normal calibrated value. The ECM increases the idle speed
using the following adjustments:
| • | The fuel injection timing is changed |
| • | The fuel injection quantity is changed |
| • | The turbocharger vane position is commanded closed--The vane position will be farther closed than any other normal operating condition. |
The instrument panel will indicate the high idle system is active one of two ways:
| • | The driver information center (DIC) will indicate an active high idle system on light duty trucks. |
| • | An indicator lamp will flash on medium duty trucks. |
| • | The manual high idle feature comes enabled from the factory. The Elevated Idle function in the scan tool will disable or enable this feature. If the engine does not increase to the calibrated high idle speed after the procedure is performed, use
the scan tool to verify the Elevated Idle speed feature is enabled. |
Manual High Idle Speed Enable and Disable
To enable or disable the manual high idle system perform the following procedure:
- Turn the ignition ON, with the engine OFF.
- Depress the accelerator pedal to the floor and hold down.
- While the accelerator pedal is depressed, depress the brake pedal 3 times in less than 8 seconds.
- Release the accelerator pedal.
- Start the engine.
When the procedure is followed the engine idle speed will slowly increased to the calibrated high idle speed. This is 1,200 RPM for light duty, and 1,500 RPM for medium duty trucks.
The idle speed will return to normal if any of the following conditions occur:
| • | There is brake, clutch, or throttle input from the driver. |
| • | The automatic transmission is shifted out of Park or Neutral. |
| • | The air temperature is more than 7°C (45°F). |
| • | The engine coolant temperature (ECT) is more than 68°C (154°F). |
| • | The vehicle speed exceeds 0 km/h (0 mph). |
The high idle system will reactivate automatically when the following conditions occur:
| • | The engine has been idling for more than 30 seconds. |
| • | The transmission is placed in Park or Neutral. |
| • | The vehicle speed is 0 km/h (0 mph). |
| • | The ambient air temperature is less than 3°C (37°F). |
| • | The ECT is less than 68°C (154°F). |
| • | The brake, clutch and throttle pedals are not depressed. |
