BASE GP- 4973514 - Caterpillar

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
1551-13 Engine Demand Fan System calibration required A calibration of the fan system is needed. The code is logged. The Electronic Control Module (ECM) supplies current to the engine fan control solenoid. The engine fan control solenoid controls the pressure to the fan pump by allowing oil to bypass the fan pump. The fan pump drives the fan. In order for the ECM to control the fan speed accurately, the ECM must determine the relationship between the current to the engine fan control solenoid and the actual fan speed. Caterpillar Electronic Technician (ET) enables the user to manually calibrate the current to a known fan speed.Note: The ECM will use a nominal current to drive the engine fan control solenoid on the initial calibration. The ECM uses the last calibrated value as the starting point on subsequent calibrations.
Select the "Service" tab and select "Calibrations". Start the "Fan Calibration".
Meet the required conditions in order to proceed with the calibration. Follow the directions that are provided on Cat ET. Proceed by pressing the "Next" button.
Measure actual fan speed with a 9U-7400 Multitach Tool Gp.
If actual fan speed matches the fan speed on Cat ET, press the "Next" button.
If actual fan speed does not match the fan speed on Cat ET, the current must be decremented in order to increase fan speed or the current must be incremented in order to decrease fan speed.
When actual fan speed matches the fan speed on Cat ET, the calibration is complete. Follow the directions that are provided on Cat ET.