CASE AS-TRANSMISSION 2750468 - Caterpillar

Table 1
J1939 Code and Description Comments
159-15
Engine Gas Supply Pressure : High - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
159-17
Engine Gas Supply Pressure : Low - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
1391-15
Engine Fuel Valve Differential Pressure : High - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
1391-17
Engine Fuel Valve Differential Pressure : Low - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
1392-15
Engine Air to Fuel Differential Pressure : High - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
1392-17
Engine Air to Fuel Differential Pressure : Low - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged. Probable Causes
Air/Fuel pressure module
Filter
Fuel system
Gas pressure
Pressure regulatorRecommended 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 the Air/Fuel Pressure Module
A. Connect Cat ET.
B. Use Cat ET verify that the calibration value for fuel pressure is within the range of −3 to 3 kPa (−0.435 to 0.435 psi).
Note: A valid calibration value is required in order to operate the engine.
C. If a 1392-13 Engine Air to Fuel Differential Pressure : Out of Calibration is active, perform a calibration. Refer to Troubleshooting, "Air/Fuel Pressure Module - Calibrate" for additional information.
Module
Result: The gauge value of the fuel pressure is reasonable when compared to the fuel pressure reading shown in ET.
Proceed to Test Step 3.
Result: The gauge value of the fuel pressure is not reasonable when compared to the fuel pressure reading shown in ET.
Repair: Replace the pressure sensor. Reset all active codes and clear all logged codes by cycling the main disconnect switch to the Off position.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Fuel Filter
A. Measure the fuel filter's differential pressure according to Operation and Maintenance Manual, "Fuel System Fuel Filter Differential Pressure - Check".
Fuel Filter
Result: The fuel filter is OK.
Proceed to Test Step 4.
Result: The fuel filter is NOT OK.
Repair: Replace the filter element.
If the problem is not resolved, proceed to Test Step 4.
Gaseous fuel is present. Personal Injury or Death can result from an open flame or spark igniting the gaseous fuel causing an explosion and/or fire. Always use a gas detector to determine the presence of gaseous fuel when maintaining and servicing. Contact your local gas provider immediately for assistance in the event of a leak.
Table 3
Troubleshooting Test Steps Values Results
4. Check the Fuel System
A. Obtain a fuel analysis.
Note: If the