Table 1 lists the diagnostic trouble codes for high intake manifold air temperature. Access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. Refer to Troubleshooting, "Engine Monitoring Parameters" for information about engine events.
| Engine Events | ||
|---|---|---|
| J1939 Code and Description | Conditions that Generate the Code | System Response |
| 105-0 Engine Intake Manifold #1 Temperature : High - most severe (3) | The temperature of the intake air into the engine has risen above the programmed threshold for the specified delay time. | The code is logged. |
| 105-15 Engine Intake Manifold #1 Temperature : High - least severe (1) | ||
| 105-16 Engine Intake Manifold #1 Temperature : High - moderate severity (2) | ||
| 1132-15 Engine Intake Manifold #3 Temperature : High - least severe (1) | ||
Follow the troubleshooting procedure in order to identify the root cause of the problem.
Test Step 1. Check for Active Diagnostic Codes
- Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools" for details.
- Download the "Product Summary Report" from the ECM before performing any troubleshooting or clearing diagnostic trouble codes.
- Determine if an associated code is active or logged. Refer to Table 2 for a list of associated codes.
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Table 2 Associated Codes J1939 Code Description 412-15 Engine Exhaust Gas Recirculation Temperature : High - least severe (1) 412-16 Engine Exhaust Gas Recirculation Temperature : High - moderate severity (2) - Check for active diagnostic codes that are related to a high intake manifold air temperature. Check for an active 105 diagnostic trouble code.
Expected Result:
No codes are active.
Results:
- OK - No codes are active at this time, but the engine has a high intake manifold air temperature. Proceed to Test Step 2.
- Active 412 Code - A 412 code is active.
Repair: Refer to Troubleshooting, "Diagnostic Trouble Codes" in order to troubleshoot the associated diagnostic code.
STOP
- Active 105 Code or 1132 Code - A 105 code or a 1132 code is active. The engine has a high intake manifold air temperature. Proceed to Test Step 2.
Test Step 2. Check the Air To Air Aftercooler (ATAAC) for Restrictions (if equipped)
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| Illustration 1 | g02214594 |
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Inspection points for the ATAAC | |
Inspect the exterior surface of the ATAAC for excessive buildup of dirt or debris. Also verify that the fins of the ATAAC are not damaged.
Expected Result:
There are no visible signs of buildup of dirt, debris, or damage to the ATAAC.
Results:
- OK - The surface of the ATAAC is not damaged and the ATAAC does not have an excessive buildup of dirt or debris. Proceed to Test Step 3.
- Not OK - The surface of the ATAAC is damaged or the ATAAC has an excessive buildup of dirt or debris.
Repair: Clean the ATAAC, if necessary. If the ATAAC is damaged, replace the ATAAC.
If the problem still exists, proceed to Test Step 3.
Test Step 3. Check the Operation of the Cooling Fan
- Verify that the engine cooling fan is working properly.
If the fan is belt driven, verify that the belt tension is adequate. Also, verify that the clutch is operating properly.
If the fan is hydraulically driven, verify that there is no leakage around the motor and that the pressure for the fan is adequate.
Expected Result:
The fan drive system is working properly.
Results:
- OK -
Repair: Return the engine to service.
STOP
- Not OK - The fan drive system is not working properly.
Repair: If the fan is belt driven, perform the necessary adjustments or perform any necessary repairs to the clutch or the belt tensioner. Refer to Testing and Adjusting for details.
If the fan is hydraulically driven, repair any leaks that have been discovered. Ensure that the control system for the fan is operating properly.
STOP