SYMPTOM RELATED DIAGNOSTICS

INJECTION PUMP RPM (ENGINE SPEED) SENSOR

This fault is found in the inactive fault table. This is a telltale fault. When it does appear in the active fault table, it only lasts a few seconds and then disappears without the Electronic Fault Lamp turning ON.

Test 2

Checking the Customer Engine Overspeed setting

1.Using a diagnostic tool, check the CUSTOMER DATA PROGRAMMING section for the overspeed setting.

2.Check the inactive fault table and verify that the fault in question has not been logged.

This fault indicates that the engine speed exceeded the customer’s engine overspeed limit set in CUSTOMER DATA PROGRAMMING

Test 1

Checking for proper RPM/TDC sensor adjustment

1.Check that the sensor is properly adjusted in the flywheel housing. For proper adjustment, refer to the Repair and Adjustment Procedures section.

If the sensor was properly adjusted, proceed to Test 2.

If the sensor was not properly adjusted, readjust the sensor. Retest to be sure the problem has been corrected.

3.Notify the vehicle owner or shop foreman that the engine had exceeded the company’s overspeed limit (do not notify the driver). Report the number of occurrences as recorded by the inactive fault table. Obtain permission to clear the fault table.

4.Record on the Repair Order along with the number of occurrences. After servicing the vehicle, recheck the inactive fault table to be sure that the service procedures have not created more overspeed faults. If so, be sure to clear them before the truck leaves the shop.

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