Class1 Electronic Fire Commander - Manual (Page 4)

Unofficial
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.
DISPLAY
SWITCH: OUTPUT:
When a switch is pressed (IDLE for instance), it will show up as:
SWITCH: IDLE and if the output is grounded with the switch, that will show up as
SWITCH: IDLE
OUTPUT: IDLE.
If an output is grounded, it will show up as OUTPUT: (function name).
This can be used to test for a grounded signal wire.
The throttle won’t increase in RPM Mode.
Check:
Is the THROTTLE READY LED on? The EFC won’t respond in RPM mode unless
the OEM safety interlock requirements that enable the throttle are met.
Try using both the PRESET and INC switches.
Does PSG Disabled display on the information center?
If operating with PTO, is VSS enabled?
Re-initialize the EFC. (Remove power to the EFC wait 10 seconds and then repower
the unit and try again.)
NOTE: The EFC performs a self-check when it is powered up. This is indicated on the
EFC by a momentary lighting of all the display segments.
The throttle won’t increase in Pressure Mode.
Check:
Are all three LED’s (PUMP ENGAGED, OKAY TO PUMP, and THROTTLE READY)
on?
Try both the INC and PRESET Switches to increase pump pressure.
Is the VSS enabled?
Re-initialize the EFC.
The THROTTLE READY LED won’t turn on.
Check:
Is the parking brake on?
Is the transmission in neutral or the PTO engaged?
Check for 12 VDC at pin # 2 of the EFC 12 pin connector.
The Engine Data Display is showing all zeroes or dashes.
Check:
Are the connections at pins # 3 and # 4 of the EFC 4 pin connector attached?