Series 40E Troubleshooting – Section 8.4 Operator On Demand Tests, Engine Running

Section 8.4
Operator On Demand Tests, Engine Running

The following tests are performed with the engine running:‪

Section 8.4.1
Standard Test, Engine Running

During the test, the ECM controls the Injection Pressure Regulator (IPR) following a pre-programmed testing sequence to evaluate the performance of the high pressure oil pump, the IPR and the injection control pressure system as a whole, both from an electrical and a hydraulic perspective.‪

The ECM monitors the feedback signal values from the Injection Control Pressure (ICP) sensor and compares them to the expected values. At the end of the test, the ECM will return the engine to the normal operating mode and transmit any fault codes that may have been set during the test.‪

Section 8.4.2
Test Procedure

Select Engine Running Test from the Diagnostic Test menu in the EST and press enter to begin the test.‪

The ECM will begin to raise the engine idle speed to a predetermined value. It will then command the IPR valve to set the injection control pressure to rated speed pressure. If the performance of the IPR is acceptable, the ECM will control the IPR valve to reduce the pressure in steps while continuing to monitor the performance of the injection control pressure system.‪

Note: To perform this test, the following conditions should be present: The engine coolant temperature must be at least 160°
F (71°
C); battery voltage must be higher than 12.5 volts; no vehicle speed sensor (VSS) signal should be present.

Note: If active fault codes are present, they must be repaired and cleared prior to running this test.

After the test is completed, normal engine operation is restored by the ECM and fault codes will be transmitted as previously described.‪

Section 8.4.3
Injector Cylinder Contribution Test, Engine Running

The Injector Test is designed to detect problems with injection and combustion events. This test will not only detect injector problems, but it will detect any problem that could affect the overall performance of the power cylinder, i.e. valves, pushrods, pistons, rings, etc.‪

During this test the ECM will control fuel delivery and determine the power contribution of each cylinder. If a cylinder is not performing satisfactorily, a fault code will be set.‪

Section 8.4.4
Test Procedure

Select Injector Test from the Engine Running Test menu and press enter to begin the test.‪

The ECM will increase the normal amount of fuel delivery (overfuel) to the injector of the cylinder being tested, and monitor the reduction of fuel required to operate the remaining injectors to maintain a constant engine speed. If the reduction in fuel delivery to the other cylinders is not what the ECM expects, it will set a fault code identifying the noncontributing cylinder.‪

Note: The engine running standard test must be performed first to gain access to the Injector (engine running) Test.

When testing is completed, normal engine operation is restored and fault codes will be transmitted to the Electronic Service Tool (EST).‪

Section 8.4.5
Wiggle Test

The purpose of the Wiggle Test is to troubleshoot intermittent connections at sensors and actuators. It may be performed with the engine off or running.‪

The EST is used to monitor the following circuits during the Wiggle Test.‪

  • Accelerator Position Sensor (APS)
  • Intake Air Temperature Sensor (IAT)
  • Camshaft Position Sensor (CMP)
  • Data Communication Link (DCL)
  • Engine Coolant Temperature (ECT)
  • Engine Oil Pressure (EOP)
  • Injection Control Pressure (ICP)
  • Manifold Absolute Pressure (MAP)
  • Remote Accelerator Pedal Sensor (RPS)
  • Engine Oil Temperature (EOT)
  • Barometric Pressure Sensor (BARO)

Section 8.4.6
Test Procedure

Select the Wiggle Test from the Diagnostic Test menu in the EST and press ENTER to begin the test.‪

The technician should wiggle connectors and wires at all suspected problem locations. The EST will beep if the circuit continuity is interrupted and will display all fault codes related to the condition.‪

Series 40E Troubleshooting Manual – 6SE241
Generated on 10-13-2008