C7.1 Engines and Generator Sets Caterpillar

Engine Overspeeds

Usage:

C7.1 770

This procedure covers the following diagnostic trouble code:

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Table 1
Diagnostic Trouble Codes for Engine Overspeed
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
190-15	E362 (1)	Engine Overspeed Warning - Level 1	The engine has exceeded the value that is programmed into the Electronic Control Module (ECM) for 0.6 seconds. There are no diagnostic trouble codes for the speed/timing sensors. The engine has been running for at least 3 seconds.
190-0	E362 (3)	Engine Overspeed Warning - Level 3	The engine has exceeded the value that is programmed into the Electronic Control Module (ECM) for 0.6 seconds. There are no diagnostic trouble codes for the speed/timing sensors. The engine has been running for at least 3 seconds. The engine may stop.

The ECM limits the flow of fuel to prevent the engine speed from exceeding the value that is programmed into the ECM. When the engine speed has dropped to less than the value that is programmed into the ECM, the 190-x code will be reset.

If the engine speed exceeds the value that is programmed into the ECM, the ECM illuminates the warning lamp and a 190-x code is logged. Factory passwords are required to clear the code. No troubleshooting is required.

The history of engine overspeeds can be viewed on the electronic service tool.

Probable Causes

Proceeding down steep grades (if applicable)
Diagnostic codes
Turbochargers
Combustible gases or liquid in the Intake air

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. Not all applications have engine brakes. A. Make sure that the operator understands the correct operation of the machine while using the engine brakes.	Steep grades	Result: Steep grades are the cause of the overspeed. Control the engine speed during steep grades. Result: Steep grades are not the cause of the overspeed. Proceed to Test Step 2.
2. Diagnostic Codes A. Download the Warranty Report and the Product Status Report with Histograms before performing any troubleshooting or clearing any diagnostic codes. Note: The downloaded information will be required by the Dealer Solutions Network (DSN) if troubleshooting assistance is needed. B. Use the electronic service tool to check for active or logged codes.	Diagnostic codes	Result: A diagnostic code is not active or logged. Return the unit to service. Result: A 190-15 (E362 (1)) or 190-0 (E362 (3)) event code is present. Proceed to Test Step 3.
3. Turbochargers Note: The turbochargers that are installed on the engine are nonserviceable items. If any mechanical fault exists, then the faulty turbocharger must be replaced. A. Check for any oil that may be leaking into the intake air.	Turbocharger	Result: A turbocharger is leaking oil into the intake air. Repair: Replace the faulty turbocharger. Proceed to Test Step 5. Result: A turbocharger is not leaking oil into the intake air. Proceed to Test Step 4.
4. Combustible Gases or Liquid in the Intake Air A. Check for combustible gases in the surrounding atmosphere. B. Check for combustible liquid in the air intake.	Air quality	Result: The atmosphere has combustible gases. Do not operate the engine in an environment with combustible gases. Result: There is combustible liquid in the air intake. Repair: Remove the liquid. Investigate and rectify the cause of liquid ingestion Result: The intake air does not contain combustible gases. Contact the Dealer Solutions Network (DSN).
5. Check the Aftertreatment System for Oil A. Remove excess oil from the piping with a clean cloth. B. Remove the Clean Emissions Module (CEM). Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". C. Support the CEM over a suitable container with the exhaust inlet downwards. Leave the CEM to drain for 8 hours. D. Check the quantity of drained oil in the container.	CEM	Result The volume of drained oil is greater than 1.0 L (1.05669 qt). Repair: Install a replacement CEM. Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". Return the unit to service. Result The volume of drained oil is less than 1.0 L (1.05669 qt). Proceed to Test Step 6.
6. Recover the Aftertreatment System A. Clean any remaining oil from the piping and the CEM inlet with a clean cloth. B. Install the Clean Emissions Module (CEM). Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". C. Run the engine at high idle with no load for a minimum of 20 minutes. D. Use the electronic service tool to perform the "Aftertreatment Recovery Procedure". While the procedure is progressing, check for smoke from the exhaust. Some smoke will be evident during the procedure. The smoke must dissipate before the procedure is completed.	CEM	Result: The "Aftertreatment Recovery Procedure" completes with a soot load of less than 80% and no smoke from the exhaust. Return the unit to service. Result: The "Aftertreatment Recovery Procedure" completes with a soot load of more than 80% or smoke from the exhaust. Contact the Dealer Solutions Network (DSN).