C27 and C32 Engines for Caterpillar Built Machines Caterpillar

Engine Overspeeds

Usage:

990K A9P

Use this procedure in order to troubleshoot an engine overspeed or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Note: Some of the following codes may not be applicable for certain applications.

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Table 1
Diagnostic Trouble Codes
CDL Code	J1939 Code	Code Description (code descriptions may vary)	Comments
E362 (1)	190-15	Engine Overspeed	The code is logged.
E362 (3)	190-0	Engine Overspeed	The code requires factory passwords to be cleared.

Probable Causes

Proceeding down steep grades (if applicable)
Proper operation of the turbocharger
Intake air
Starting aids that are not operating properly

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Proceeding Down Steep Grades (If Applicable) Engaging the engine brakes on a steep grade may be necessary. A. The operator needs to understand the proper operation of the machine while using the engine brakes. Not all applications have engine brakes.	Steep grades	Result: Steep grades are the cause of the overspeed. Repair: Control the engine speed during steep grades. Result: Steep grades are not the cause of the overspeed. Proceed to Test Step 2.
2. Proper Operation of the Turbocharger A. Check for proper operation of the turbocharger. B. Check for any oil that may be leaking into the air inlet.	Turbocharger	Result: The turbocharger is leaking oil into the inlet. Repair: Repair or replace the turbocharger. Result: The turbocharger is not leaking oil into the inlet. Proceed to Test Step 3.
3. Intake Air A. Check for combustible gases in the surrounding atmosphere. B. Check for proper operation of starting aids (if equipped).	Air quality	Result: The atmosphere has combustible gases. Repair: Do not operate the engine in an environment with combustible gases.