HARNESS AS 1028602 - Caterpillar

Probable Causes
Codes
Inlet air temperature
Coolant temperature
Air/Fuel ratio
Inlet air restriction
Sensor
Connectors and wiring
Exhaust restriction
Engine overload
Aftercooler
Coolant flow
Air flowRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check for High Inlet Air Temperature
Temperature
Result: The inlet air temperature is OK.
Proceed to Test Step 3.
Result: The inlet air temperature is NOT OK.
Repair: Determine the reason for high inlet air temperatures. Repair or replace damaged components.
If the problem is not resolved, proceed to Test Step 3.
3. Check for High Coolant Temperature
A. Refer to Troubleshooting, "Coolant Temperature Is High" for additional information.
Temperature
Result: The coolant temperature is OK.
Proceed to Test Step 4.
Result: The coolant temperature is NOT OK.
Repair: Determine the reason for high coolant temperatures. Repair or replace damaged components.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Air/Fuel Ratio
Note: If the air/fuel mixture is too lean, compression of the higher volume of air through the turbocharger will increase the temperature.
A. Obtain a fuel analysis.
Note: If the quality of the gas is inconsistent, obtain several analyses over a time.
B. Enter the data into Caterpillar Software , "Gas Engine Rating Pro (GERP)".
C. Verify that the fuel supply pressure is adequate and stable.
D. Verify that the exhaust emissions are correct.
Air/Fuel Ratio
Result: The air/fuel ratio is OK.
Proceed to Test Step 5.
Result: The air/fuel ratio is NOT OK.
Repair: