C13 and C15 Engines for Combat and Tactical Vehicles Caterpillar

"Idle Shutdown Timer"

The "Idle Shutdown Timer" is intended to improve fuel economy by limiting idling time.

The "Idle Shutdown Timer" is a "Customer Specified Parameter" that may be programmed for any period from 1 to 1440 minutes.

The timer is activated when all of the following conditions are met regardless of the position of the parking brake:

• The vehicle speed is 0.

• The engine is not in "Cold Mode" or "Dedicated PTO Mode".

• The engine is not under load.

The timer can be reset by moving the vehicle or the timer can be reset by quickly depressing the accelerator pedal and releasing the accelerator pedal.

The check engine lamp will begin to rapidly flash (Driver Alert) 30 seconds before the programmed idle time expires when the shutdown timer is programmed to one minute. The lamp will begin to rapidly flash 90 seconds before the programmed idle time expires when the programmed idle time is 2 minutes or more. The flashing lamp is to alert the driver the engine is about to shut down. During this 30-90 second Driver Alert period, the following conditions can disable the timer:

• The driver depresses the clutch pedal.

• The driver depresses the service brake pedal.

The 71-00 Idle Shutdown Override will be logged when the driver overrides the timer by the use of the clutch pedal or the brake pedal during the final 30 to 90 second period.

If the parameter for the "Allow Idle Shutdown Override" is programmed to "NO", the timer can not be overridden by the use of the clutch pedal or the brake pedal during the final 30 to 90 second Driver Alert period. This parameter is programmed to "YES" as the factory default.

An additional parameter can be programmed to allow the timer to be reset above a specified engine speed. When the "Idle Shutdown Timer Maximum RPM" parameter is programmed to a value below the "Top Engine Limit", the timer can be reset by increasing engine rpm above the programmed limit. The timer will be reset as the engine rpm drops below the programmed value. The timer will begin counting again. The factory default for the "Idle Shutdown Timer Maximum RPM" is 2120 rpm. This setting will disable this feature. The "Top Engine Limit" for this engine is 2120 rpm.

The 71-01 Idle Shutdown will be logged if the timer is activated and the timer is allowed to shut down the engine.

The timer can be disabled by programming "Idle Shutdown Timer" to 0 (Caterpillar factory default).

The Engine Control Module (ECM) will shut down the engine but not the vehicle electrical system when the "Idle Shutdown Timer" time expires. The "Engine Shutdown Output" can be used to shut down the vehicle electrical system after the "Idle Shutdown Timer" time has expired.

The "Idle Shutdown Timer" feature can be temporarily disabled by the use of Caterpillar Electronic Technician (ET). The "Idle Shutdown Timer" feature can be temporarily disabled through the "System Troubleshooting Settings" screen in order to help troubleshoot other problems. Temporarily disabling this feature avoids engine shutdowns when you are troubleshooting other systems. The use of this method eliminates the need to temporarily alter the customer specified parameter of "Idle Shutdown Timer".

Note: If the 84-08 Vehicle Speed signal out of range is active, the "Idle Shutdown Timer" will not operate.

The timer can be overridden if the "Allow Idle Shutdown Timer Override" parameter is programmed to "Outside Temperature Based" or "J1587 Outside Temperature Based". If the temperature that is being sensed by the ECM is below the minimum air temperature that is programmed or the air temperature is above the maximum air temperature that is programmed, the idle shutdown timer will be overridden.

Test Step 1. Verify Activation of the "Idle Shutdown Timer"

1. Connect Cat ET to the data link connector.

2. Access the "Configuration" screen on Cat ET.

   1. Record the programmed time for the "Idle Shutdown Timer".

      Note: The "Idle Shutdown Timer" must be between 1 and 1440 minutes. The timer is disabled if the "Idle Shutdown Timer" is programmed to 0.

   2. Record the programmed status of the parameter for the "Allow Idle Shutdown Override" and the "Idle Shutdown Timer Maximum RPM".

3. Start the engine. Allow the engine to warm up until the coolant temperature is 38 °C (100 °F). Allow the engine to operate at the programmed low idle and turn off any unnecessary accessory devices.

4. Ensure that all unnecessary loads are turned off.

   The "Idle Shutdown Timer Maximum RPM" can be programmed to allow the timer to be reset by increasing the engine rpm above the programmed limit. Ensure that the accelerator is not being depressed so that the rpm increases beyond the programmed limit.

   1. Ensure that the status for "Vehicle Speed" on Cat ET is 0 km/h (0 mph).

   2. Ensure that the engine speed on the status screen is at "Low Idle".

   3. Ensure that the clutch pedal is not depressed. Ensure that the brake pedal is not depressed.

   4. Ensure that the status of the PTO on/off switch is off.

   5. Observe the "Idle Shutdown Status".

Expected Result:

The "Idle Shutdown Status" indicates "Counting" or the "Idle Shutdown Status" indicates "Not Active".

Results:

• Counting - The "Idle Shutdown Status" indicates "Counting". The ECM is reading the proper conditions for the activation of the "Idle Shutdown Timer". Proceed to Test Step 2.

• Not Active - The "Idle Shutdown Status" indicates "Not Active". The ECM is not reading the proper conditions for activation of the "Idle Shutdown Timer". Proceed to Test Step 3.

Test Step 2. Verify the Driver Alert Function for Idle Shutdown and the Override Function for Idle Shutdown

1. Access the "Configuration" screen on Cat ET.

   1. Reprogram the "Idle Shutdown Timer" to 1 minute for this test.

2. Observe the following items during the 30 second period before the programmed shutdown time:

   • Check engine lamp on the vehicle's dash panel

   • Idle shutdown status on Cat ET

3. If the "Allow Idle Shutdown Override" parameter is programmed to "YES", perform either of the following actions in order to override the shutdown:

   • Depress the clutch pedal.

   • Depress the service brake pedal.

   Note: This action must be accomplished while the check engine lamp is flashing. The check engine lamp flashes during the 30 second period before the programmed shutdown time. The 90 second Driver Alert period can be tested by programming the "Idle Shutdown Timer" to 2 minutes or longer.

4. Reprogram the "Idle Shutdown Timer" to the original value.

Expected Result:

During the 30 to 90 second Driver Alert period before the scheduled shutdown, the status changes from "Counting" to "Driver Alert" and the check engine lamp flashes rapidly. If the "Allow Idle Shutdown Override" is programmed to "YES", the "Idle Shutdown Status" changes to "Override" after the pedals are depressed.

Result 1 The "Idle Shutdown Timer" behaves in the manner that is described above.

Result 2 The check engine lamp did not flash during the alert.

Result 3 The ECM did not detect a change in the status of the service brake.

Result 4 The ECM did not detect a change in the status of the clutch.

Results:

• Result 1 - The "Idle Shutdown Timer" behaves in the manner that is described above.

  Repair: The "Idle Shutdown Timer" is operating correctly.

  STOP

• Result 2 - The check engine lamp did not flash during the alert.

  Repair: There may be a problem with the check engine lamp. Refer to Troubleshooting, "Check Engine Lamp Circuit - Test" for information that is related to troubleshooting the circuit for the check engine lamp.

  STOP

• Result 3 - The ECM did not sense a change in the status of the service brake.

  Repair: There may be a problem with the service brake switch. Refer to Troubleshooting, "Service Brake Pedal Position (Switch 1) Circuit - Test" for information that is related to troubleshooting the circuit for the service brake switch.

  STOP

• Result 4 - The ECM did not sense a change in the status of the clutch.

  Repair: There may be a problem with the clutch switch. Refer to Troubleshooting, "Clutch Pedal Position Switch Circuit - Test" for information that is related to troubleshooting the circuit for the clutch switch.

  STOP

Test Step 3. Check the State of the Related Conditions when the Vehicle is Parked

1. Check the state of the following related conditions when the vehicle is parked:

   • Ensure that the vehicle speed is 0 km/h (0 mph) on Cat ET and the dash display.

   • Ensure that the engine is not in cold mode. (The status screen on Cat ET will indicate that "Cold Mode" is "Active" in the corner of the display screen.)

   • Ensure that the PTO on/off switch is in the OFF position.

   • Ensure that the engine is at the programmed low idle.

Expected Result:

Result 1 Vehicle speed is not indicated as 0 km/h (0 mph).

Result 2 The status screen on Cat ET indicates that the engine is in cold mode.

Result 3 The status of the PTO on/off switch is not "OFF".

Result 4 The engine is not at the programmed low idle.

Results:

• Result 1 - Vehicle speed is not indicated as 0 km/h (0 mph).

  Repair: There may be a problem with the speedometer circuit. Refer to Troubleshooting, "Vehicle Speed and Speedometer Circuit - Test" for information that is related to troubleshooting the speedometer circuit.

  STOP

• Result 2 - The status screen on Cat ET indicates that the engine is in cold mode.

  Repair: The engine must not be in "Cold Mode" operation while this test procedure is being performed. Allow the engine to run until the coolant temperature exceeds 20 °C (68 °F). Troubleshoot and repair any related conditions.

  STOP

• Result 3 - The status of the PTO on/off switch is not "OFF".

  Repair: There may be a problem with the PTO switch. Refer to Troubleshooting, "PTO Switch Circuit - Test" for information that is related to troubleshooting the PTO switch.

  STOP

• Result 4 - The engine is not at low idle.

  Repair: Return the engine to low idle. Perform the test procedure again.

  STOP