Class1 Electronic Fire Commander - Manual (Page 5)

Unofficial
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.
Check:
Are the PUMP ENGAGED and OKAY to PUMP LED’s on?
Is there a ground at pin #1 of the EFC 12 pin connector?
Is there a ground at pin #4 of the EFC 12 pin connector?
The PRESET switch doesn’t work:
Check:
Are the proper LED’s on for the mode you want to operate?
Is there a valid preset programmed into the menu?
Does the PRESET switch work in the menu I/O test?
The EFC doesn’t light up.
Check:
Are the necessary switches turned on?
Is there 12 VDC between pins #1 and #2 at the EFC 4 pin connector.
Summary:
The DDC Pressure Sensor Governor operates similar to cruise control. It uses the
DDEC III digital inputs and outputs (ground) to control the engine and indicators.
Digital Inputs Pressure Governor System Enable (ground when enabled)
Pressure/RPM Mode Switch (ground
Parking Brake Interlock
Set/Coast On (Decrease)
(ground to decrease)
Resume/Acceleration On (Increase) (ground to Increase)
These inputs are programmed into the DDEC ECU and the configuration may vary, a
check should be done at installation to verify which port is configured for what input.
Digital Outputs Cruise Control Active Light (ground when active)
Pressure Governor Active Light (ground when PSG pressure
PSG Pressure Mode Achieved mode is active)
These outputs are programmed into the DDEC ECU and the configuration may vary, a
check should be done at installation to verify which port is configured for what output.