FIRE TRUCK PRESSURE GOVERNOR FAULT
10.13.10.3 Troubleshooting the Electronic Fire Commander
This section lists some of the common troubles encountered during the installation and check out
of the Electronic Fire Commander. These conditions are listed and the suggested actions follow
each one. The Electronic Fire Commander wiring is listed in Table 10-18, listed in Table 10-19,
listed in Table 10-20.
1. Condition: The EFC will not light up.
Check if the necessary switches are turned on.
Check if there is a 12 VDC between pins #1 and #2 at the EFC 4-pin connector.
2. Condition: The throttle will not increase in RPM Mode.
Check if the THROTTLE READY lamp is on. The EFC will not respond in RPM
mode unless the OEM safety interlock requirements that enable the throttle are met.
Press the PRESET and then the INC switches. Does the EFC indicate it is increasing
RPM on the data display?
Check the switch and outputs in the Menu I/O test.
Re-initialize the EFC. (Remove power to the EFC; wait ten seconds and then power
the unit and try again.)
The EFC performs a "self-test" when it is powered up. This is indicated on the EFC by a
momentary lighting of all the display segments.
3. Condition: The throttle will not increase in Pressure Mode.
Check that all three lamps: PUMP ENGAGED, OKAY TO PUMP, and THROTTLE
READY are on.
Press the INC and then the PRESET buttons to increase pump pressure.
Check for a pump discharge pressure reading in the Menu.
Re-initialize the EFC.
4. Condition: The Engine Data Display is showing all zeroes.
Check that the connections at pins #3 and #4 of the EFC 4-pin connector are secure.
Check there is continuity on the 900 and 901 circuits from the ECM connector
to the EFC connector.
5. Condition: The THROTTLE READY lamp will not turn on.
Check that the parking brake is on.
Check that the transmission is in neutral, or the hand throttle (PTO) is engaged.
Check for 12 VDC at pin #2 of the EFC 12-pin connector.
6. Condition: The PUMP ENGAGED and OKAY TO PUMP lamps do not turn on.
Check that all OEM safety requirements for pump operation are fulfilled.
Is the parking brake on?
Is the transmission in the proper range for pump operation?
Is the hand throttle (PTO) engaged?
Is there an OK to PUMP indication in the cab?
Check for 12 VDC at pin #10 of the EFC 12-pin connector.
7. Condition: The mode will not change from RPM to Pressure.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION