ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 014-008   Engine Testing (In Chassis)

The Setup for Dynamometer function is used to prepare the attached electronic control module (ECM) for advanced diagnostic tests run on the dynamometer. For purposes of this test, the Maximum Engine Speed without a vehicle speed sensor (VSS), the Maximum Vehicle Speed in Top Gear, and the Maximum Vehicle Speed in Lower Gear are set to their maximum values. The idle shutdown feature is disabled. All of these values are automatically reset to their previous values when the engine keyswitch is turned off.

Settings

Maximum Engine Speed without VSS: For testing purposes, this speed is temporarily set to the maximum value allowed (3000 rpm).

Maximum Vehicle Speed in Top Gear: For testing purposes, this speed is temporarily set to the maximum value allowed (120 mph).

Maximum Vehicle Speed in Lower Gear: For testing purposes, this speed is temporarily set to the maximum value allowed (120).

Idle Shutdown: This feature is temporarily disabled for testing purposes (Disable).

Some J1939 electronic subsystems must be disabled. The user has the ability to enable or disable the J1939 datalink with the service tool.

Refer to the INSITE™ user’s manual for detailed setup for Dynamometer Instructions.

The automated cylinder performance test is the most thorough test of cylinder performance (versus the single-cylinder cutout test, which tests the performance of individual cylinders only). The service tool must be attached to an electronic control module (ECM) to perform this test. Follow the steps outlined in Preparing to Run the Automated Cylinder Performance Test, to make sure the best possible outcome is achieved.

This test is automated in the sense that, once the test is started, the service tool controls what cylinders are disabled or enabled, what ECM values are recorded, and what information displays as a result of the test. Once the test is finished, follow the steps outlined in After Running the Automated Cylinder Performance Test to make sure the engine returns to its original state.

This test will produce a Pass or Fail message for each cylinder. Its percent contribution value is also displayed.

Preparing to Run the Automated Cylinder Performance Test

Before performing this test, make sure you:

1. Clear the areas around the engine and the fan, and make sure the exhaust is vented correctly.
2. Operate the engine until the coolant temperature is a minimum of 76.7°C [170°F].
3. Shut off the engine.
4. Lock the fan clutch in the ON position for continuous operation.
5. Shut off the air conditioning.
6. Disengage any devices that can cause the load on the engine to vary.
7. With the vehicle stationary, start the engine and let it idle.
8. Start the test using INSITE™.

Refer to the INSITE™ user’s manual for detailed automated cylinder performance test instructions.

After Running the Automated Cylinder Performance Test

It is normal for the engine rpm to vary during the test, but if the engine rpm goes to high idle for more than 5 seconds at a time, shut off the engine.

Once the test is complete, make sure to:

1. Shut off engine.
2. Return the fan to normal operation, if necessary.
3. Perform the suggested repairs that resulted from the test.
4. Return any disengaged devices to their normal mode of operation.

Use the single-cylinder cutout test to remove individual cylinders from the engine firing cycle and to monitor a running engine while the selected cylinder is disabled. The system displays the percent load and rpm values while the cylinder is disabled.

The service tool must be attached to a running engine in a nonmoving vehicle to perform this test.

Refer to the INSITE™ user’s manual for detailed cylinder cutout test instructions.

Cylinder to be Cut Out

None: Select this option to run all cylinders.

1 through 6: Select one of these options to shut off cylinder Nos. 1 through 6, respectively. Only one cylinder can be shut off at a time.

Monitor

Percent Load: The percent of load that the engine is carrying.

rpm: The engine’s revolutions per minute.

Turbocharger Actuator Test

Use the turbocharger actuator test to verify the correct functioning of the variable geometry turbocharger actuator. During the test, air pressure is applied to the actuator and rod travel is measured.

The service tool must be attached to an ECM to perform this test.

Refer to INSITE™ user’s manual for detailed turbocharger actuator test instructions.

Use INSITE™ to extend and retract the turbocharger actuator rod several times.

Measure the distance the actuator rod travels when extended.