PLATE 3263251 - Caterpillar

The Engine Control Module (ECM) detects the following conditions:
The intake manifold air temperature is greater than 90 °C (194 °F) for more than four seconds.
The engine has been running for at least 30 seconds.
The engine coolant temperature is above 99 °C (210 °F).System Response:"DIAG" will be displayed next to the status for "Intake Manifold Air Temperature" on Caterpillar Electronic Technician (ET). The warning lamp will turn on if the "Engine Monitoring Lamps" parameter is programmed to "Warning Lamp". The check engine lamp will turn on if the "Engine Monitoring Lamps" parameter is programmed to "Option 1".Customer passwords are required to clear this diagnostic code.Possible Performance Effect:
There are no performance effects.Troubleshooting:This diagnostic code indicates an excessive temperature in the intake manifold.Test Step 1. Check the Coolant Level
Allow the engine to cool.
Check the engine coolant level. Note: The engine coolant is used to cool the intake air after the turbochargers and before the air-to-air aftercooler.Expected Result:The engine coolant level is OK.Results:
OK - The engine coolant level is OK. Proceed to Test Step 2.
Not OK - The engine coolant level is low.Repair: Add coolant to the proper level.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Aftercooler
Check the air-to-air aftercooler for debris and/or restriction to the air flow. Expected Result:There are no restrictions to the air flow through the air-to-air aftercooler.Results:
OK - There are no restrictions in the air flow.Repair: Determine the cause of the high temperatures. Heavy loads and high ambient air temperatures could cause the temperature to be above the trip point.STOP
Not OK - There are restrictions in the air flow.Repair: Remove the restrictions in the air flow.Verify that the repair eliminates the problem.STOP