C27 and C32 Engines for Caterpillar Built Machines Exhaust Temperature Is High Caterpillar


Exhaust Temperature Is High
`
C27 and C32 Engines for Caterpillar Built Machines [KENR9197]
1.1. Probable Causes
2.1. Recommended Actions
3.2. Engine Operating Conditions
4.2. Aftercooler
5.2. Power Supply to the Atmospheric Pressure Sensor

Use this procedure in order to troubleshoot a high exhaust temperature or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes. You must access the engine monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Table 1
Event Code 
Code and Description  Conditions which Generate this Code  System Response 
E194(1) High Exhaust Temperature  The exhaust temperature that has been calculated by the Electronic Control Module (ECM) is above the trip point temperature.  The code is logged. 

The activation of this event indicates that a high virtual exhaust temperature has been calculated by the ECM. This temperature is calculated with maps that utilize intake manifold temperature, atmospheric pressure, and engine speed as factors.

High intake manifold air temperature, high altitude operation, and high engine loads can cause the exhaust temperature to increase to a level that may damage the exhaust valves and other components of the exhaust system.

When this event occurs, the ECM derates the engine in order to reduce the exhaust temperature. This helps to protect the components of the exhaust system from damage.

Probable Causes

  • Engine operating conditions

  • Aftercooler

  • Power supply to the atmospheric pressure sensor

Recommended Actions

Engine Operating Conditions

Consider high altitude operation of the engine when you troubleshoot this diagnostic code. High altitude operation can cause the code to be generated. This is normal.

Interview the operator, when possible. Determine if the engine is being operated under heavy load. Ensure that the engine is being operated at the proper engine speed.

Aftercooler

The intake manifold air temperature can increase if the flow through the aftercooler is obstructed. Thoroughly check the aftercooler for obstructions. Ensure that the flow of air or coolant through the aftercooler is adequate.

Power Supply to the Atmospheric Pressure Sensor

If the atmospheric pressure sensor is not being powered by the 5 volt supply, the output of the sensor may float to a value that is interpreted by the ECM as a high altitude condition. The ECM receives the erroneous value of altitude and the ECM derates the engine. Ensure that the 5 volt supply is present at the harness connector for the atmospheric pressure sensor.

Information System:

C32 Engine for D11T Track-Type Tractors Fuel Temperature Is High
C32 Engine for D11T Track-Type Tractors Fuel Filter Is Restricted
CP54 and CS54 Vibratory Soil Compactors Machine Systems System Pressure - Release
140M and 150 Motor Grader Window Wiper and Wiper Motor (Door) - Remove and Install - Side
Installation of the Power Shift Solenoid{5264, 5479}
C32 Engine for D11T Track-Type Tractors Coolant Temperature Is High
CB34, CB34XW and CC34 Utility Compactors Fuel System Water Separator Element - Replace
CB34, CB34XW and CC34 Utility Compactors Plate Locations and Film Locations
CB34, CB34XW and CC34 Utility Compactors Capacities (Refill)
CB34, CB34XW and CC34 Utility Compactors Sound Information and Vibration Information
CB22, CB24, CB32 and CC24 Utility Compactors Capacities (Refill)
140M and 150 Motor Grader Blade Lift Cylinder - Remove and Install
C32 Engine for D11T Track-Type Tractors Inlet Air Temperature Is High
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Vibratory Frequency - Test and Adjust - Fixed
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Magnetic Sensor (Vibratory) - Test and Adjust
CP54 and CS54 Vibratory Soil Compactors Machine Systems Hydraulic Oil Contamination - Test
140M and 150 Motor Grader Power Train Gear Pump (Transmission Charging and Scavenge) - Remove
140M and 150 Motor Grader Power Train Gear Pump (Transmission Charging and Scavenge) - Install
VIMS Communicator Troubleshooting
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Case Drain Flow for Piston Motor (Vibratory) - Test
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Piston Motor (Vibratory) - Test - Cooling Valve
The Lubrication Sleeve in the Planetary Case and Parts Group is Inadequately Retained on some Off-Highway Trucks{3030, 3064, 3160, 7540}
24M Motor Grader Power Train Electronic Control System MID 027 - CID 1473 - FMI 14
140M and 150 Motor Grader Window Wiper and Wiper Motor (Door) - Remove and Install - Door