HEAD GP-PUMP 9T8108 - Caterpillar

Probable Causes
Diagnostic codes
Cold mode
Starting aids (if applicable)
Water temperature regulators
Unit injectors
Flash file
Fuel supply
Component wear
Cooling system
Engine timingRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Establish communication between Cat Electronic Technician (Cat ET) and the ECM. Refer to Troubleshooting"Electronic Service Tools", if necessary.
Diagnostic Codes
Result: A diagnostic code is not active or logged.
Proceed to Test Step 2.
Result: A diagnostic code is active or logged.
Repair: Troubleshoot any codes before continuing with this procedure. Verify that the repair eliminated the problem.
2. Cold Mode
A. Use Cat ET to verify that the engine has exited cold mode. Cold mode operation may slow throttle response.
If the engine is operating in cold mode, an indicator will be displayed on the top of any of the status screen.
Cold Mode
Result: The engine is not operating in cold mode.
Proceed to Test Step 3.
Result: The engine has not exited from the cold mode.
Repair: This is normal operation. Return the engine to service.
3. Starting Aids
A. Ensure that the air inlet heater is operating correctly. Refer to the diagnostic functional test Troubleshooting"Air Inlet Heater Circuit - Test".
B. Ensure that the ether injection system is operating correctly. Refer to the diagnostic functional test Troubleshooting, "Ether Injection System - Test".
Starting Aid
Result: The air inlet heater and the ether injection system are operating correctly.
Proceed to Test Step 4.
Result: The air inlet heater and/or the ether injection system is not operating correctly.
Repair: Make the necessary