Manual

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Operating the Detroit Diesel Electronic Fire Commander

(EFC):

MODES:

There are two modes of operation for the Electronic Fire Commander. The RPM

Mode controls the engine speed to a desired RPM and the Pressure Mode controls

the engine speed to maintain a desired pump discharge pressure. The operating

mode of the Fire Commander can be changed from RPM Mode to Pressure Mode

and back without the need to return to idle. When the MODE switch is pressed, the

Fire Commander will change from one mode to the other and utilize the RPM or

Pump Pressure that is current at the time the change is made for engine control.

manuals\efc\efc-2.ai

Summary of content (8 pages)

PAGE 1
Operating the Detroit Diesel Electronic Fire Commander (EFC): MODES: There are two modes of operation for the Electronic Fire Commander. The RPM Mode controls the engine speed to a desired RPM and the Pressure Mode controls the engine speed to maintain a desired pump discharge pressure. The operating mode of the Fire Commander can be changed from RPM Mode to Pressure Mode and back without the need to return to idle.
PAGE 2
Operating the Detroit Diesel Electronic Fire Commander: RPM Mode: The EFC must be on and the Throttle Ready LED (interlocks necessary for increased throttle operations are active) must be illuminated before any RPM adjustments can be made. The RPM LED will be on to indicate that the EFC will operate in the RPM mode. l a Engine speed can be controlled to a predetermined RPM by pressing the PRESET switch.
PAGE 3
Programming the Detroit Diesel Electronic Fire Commander: Programming the EFC is simply a matter of selecting items from a menu. To enter the programming menu, Press and hold the MODE and MENU switches at the same time until “Press Idle to Exit “ is displayed on the information center, then release both switches. Moving through the menu is accomplished by pressing the MENU switch. Change to a selection is performed by using the INC and DEC switches. Exiting the programming menu is done in one of two ways.
PAGE 4
Troubleshooting the Detroit Diesel Electronic Fire Commander: The DDEC III ECM must be programmed for Pressure Sensor Governing and the Digital I/O’s must be configured properly for PSG operation. Additionally the VSS should be turned off in pressure governor operation. You can use the EFC I/O test as an aid in troubleshooting. The INC, DEC, IDLE,MODE and PRESET switches as well as their outputs are tested.
PAGE 5
Troubleshooting the Detroit Diesel Electronic Fire Commander: The PUMP ENGAGED and OKAY to PUMP LED’s won’t turn on. Check: All OEM safety requirements for pump operation must be fulfilled. Is the Parking Brake on? Is the transmission in the proper range for pump operation? Is the PTO engaged? Is there an OK to PUMP Signal in the cab? Check for 12 VDC at pin #10 of the EFC 12 pin connector. The mode won’t change from RPM to Pressure.
PAGE 6
Electronic Fire Commander (EFC) Wiring MATING CONNECTOR 1: CAVITY A-1 A-2 A-3 A-4 DT06-4S CIRCUIT DESCRIPTION DDEC Ignition Power DDEC Accessory Ground DDEC #900 Data Link (+) DDEC #901 Data Link (-) MATING CONNECTOR 2: DDC# EFC INPUT/OUTPUT 439 953 900 901 (+) System Power (-) System Ground J1587 Serial Link J1587 Serial Link DT06-12S CAVITY CIRCUIT DESCRIPTION B-1 DDEC PGS Mode Select DDC#/PORT 523/H1 l a EFC INPUT/OUTPUT i c Output (ground) to DDEC SIGNALS DDEC TO TOGGLE BETWEEN PRESSUR
PAGE 7
DDEC ECM EFC B 1 523 Mode Select SELECT PSI or RPM MODE OEM INTERLOCK 12VDC (EFC GROUNDS B-5 WHEN ACTIVE) B 2 B 3 NC B 4 GROUND WHEN PRESSURE MODE IS ACTIVE GROUND TURNS ON PSG B 6 INCREASE B 8 i ff DECREASE B 7 GROUND WHEN PSG IS ACTIVE ALARM OUT (gnd) B 9 B10 o n NC B11 543 PSG Enable 545 INC 541 DEC Y3 Cruise Active (PSG enabled) LOW FUEL IN (gnd) (From Tank Switch) B12 EFC i c B 5 l a 499 Mode Active U DDEC ECM PUMP ENGD INTERLOCK (OK2PUMP)
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