It combines a Pressure Sensor Governor (PSG) controller, a system monitor, and a display for vital engine operating parameters into one compact, durable package. The Detroit Diesel Electronic Fire Command ™ (EFC) is designed to support Detroit Diesel engines in the fire fighting market. If the DDR displays OFF when decrease is depressed, circuit #541 is open or shorted to a voltage source.Refer to "10.13.9 Electronic Fire Commander If DDR displays OFF to ON when Set/Coast decrease is depressed, check the EFC.Observe the displays and Set/Coast, while depressing the decrease switch.Verify all interlocks are set (parking brake, transmission neutral, etc.).If the DDR displays OFF when increase is depressed, circuit #541 is open or shorted to a voltage source.If DDR displays OFF to ON when increase is depressed, check the EFC.Observe the displays and Res/Accel, while depressing the increase switch.Pressure Transducer and Harness Connector If the EFC tests okay, refer to "10.13.9 Electronic Fire Commanderįigure 1. If the DDR displays OFF when Pressure Mode is selected, the mode selector wire (circuit #523) or switch is open or shorted to a voltage source."Pressure Transducer and Harness Connector " Check for possible intermittent open circuitor short to voltage source. If DDR displays ON when Pressure Mode is selected, the mode selector (circuit #523) is functioning properly.If the wiring is incorrect, correct the wiring and retest.If the EFC tests okay, refer to "10.13.6 Verify Mode Selector Operation" If the wiring is correct, refer to "10.13.9 Electronic Fire Commander.Compare pressure sensor harness wiring to the diagram. ![]() ![]() Perform the following steps to identify the problem: If PSG ENABLE reads ON, refer to "10.13.7 Check Resume / Accel Switch".Check circuit #543 for an open condition between battery ground or a short to a voltage source. If PSG ENABLE reads OFF, the PSG ENABLE input (circuit #543) is not grounded.Verify all interlocks are set (parking brake, transmission neutral, etc.).Perform the following steps to check the system ground: EFC Fault Information refer to "10.13.9 Electronic Fire Commander.No decrease function refer to "10.13.8 Check Set / Coast Switch".No increase function refer to "10.13.7 Check Resume / Accel Switch".No pressure mode, refer to "10.13.6 Verify Mode Selector Operation".Does not operate refer to "10.13.4 Check System Ground".Use the following procedure to identify the problem with the PSG: Manual, 7SA800 and refer to "10.13.10.3 Troubleshooting the Electronic Fire Commander" Refer to the DDEC III Application And Installation If the problem was found, correct the settings and retest.If the system is enabled and the in/outs are correctly configured, refer to "10.13.3 Identify Problem".O governor enabled (engine configuration). Refer to the Application and Installation manual for the appropriate engine model to ensure correct inputs and outputs are configured. ![]() Perform the following steps to verify the PSG configuration. Verify Correct Pressure Sensor Governor Configuration The Pressure Sensor Governor (PSG) System is a DDEC feature, programmed to allow the engine speed to change in order to maintain a steady water pump pressure (pressure mode) or hold a steady engine speed (RPM Mode). The following procedure will troubleshoot fire truck pressure governor fault. Section 10.13.1
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |