Series 40E Troubleshooting – Section 11.9 Est Tool — Engine Running Test

Section 11.9
Est Tool — Engine Running Test

Figure 1. Diagnostic Form

The EST (Electronic Service Tool) is used to signal the ECM to perform the Engine Running Test. The ECM will exercise the actuators and monitor sensor feedback signals. If a sensor or actuator problem exists, the ECM will transmit fault code(s) to the EST. For a reproduction of the applicable portion of the diagnostic form, see Figure
“Diagnostic Form”

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Section 11.9.1
Purpose

The purpose of the Engine Running Test is to verify the electronic sensors and actuators of the engine are operating properly within their specified operating ranges.‪

Section 11.9.2
Test Procedure

Before running this test, apply the parking brake and ensure the transmission is in neutral.‪

1. Start and run the engine until it reaches 160°F (71°C) minimum.

   Note: The engine must be at least 160°F (71°C) to allow the ECM to perform an accurate test of the engine sensors and actuators. If the engine coolant temperature is below self test range, the EST tool will display an “ECT out of self test range” message.

2. Access the Engine Running Test from the DIAGNOSTIC TESTS menu by pressing the ↓ key until ENGINE RUNNING TEST displays on the screen. Then press the enter key. See Figure
   “Diagnostic Form”

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   Figure 2. Diagnostic Form

The ECM will conduct the test. It will command the engine to accelerate to a predetermined engine r/min and operate the Injection Pressure Regulator (IRP) valve.‪

The ECM will measure the effects of the IPR valve movement via the ICP sensor. At the completion of the test, the EST screen will display 00 FAULTS, if no faults were detected. If the EST indicates faults have been detected, press the enter key to display the fault codes. Record the fault codes and refer to the Electronic Diagnostic Form for fault codes that were detected. Refer to “10.1 Introduction”

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Section 11.9.3
Possible Causes

Possible causes of fault codes from the engine running test include:‪

• Defective or inoperative ICP sensor or IPR valve
• Injection Control System high pressure oil leakage
• Defective high pressure pump
• Open or shorted wiring harness to sensors or actuators
• Loose or corroded engine wiring harness connections at sensors or actuators