DDEC TROUBLESHOOTING
3. The RPM Mode lamp should be lit, indicating the system is in RPM Mode.
4. Engine speed can be adjusted using the following buttons:
Press the PRESET button to command the engine to go to the preset speed.
Press the INC button to increase engine speed in 25 RPM increments each time
the button is pressed.
Press and hold the INC button to increase the speed at a faster rate equivalent to 2
increments per second.
Press the DEC button to decrease engine speed in 25 RPM increments.
Press and hold the DEC button to decrease the speed at a faster rate equivalent to 2
increments per second.
Press the IDLE button to immediately return the engine to the normal idle speed.
10.13.9.3
Setting the Pressure Mode
Perform the following steps to set the Pressure Mode:
1. Start engine and adjust the system to run in the RPM Mode as described in the previous
sections.
2. Ensure conditions are met for the PUMP ENGAGED and OKAY TO PUMP and
THROTTLE READY lamps to be on. (This usually requires that required safety interlocks
for engine speed increase and pump operation are met.)
3. Press the MODE button and the PRESSURE lamp will illuminate.
4. Pump discharge pressure can now be adjusted with the following buttons.
Press the PRESET button to command the engine to go to the preset pump pressure.
Press the INC button to increase discharge pressure in 4 PSI increments each time
the button is pressed.
Press and hold the INC button to increase the pressure at a faster rate equivalent to 2
increments per second.
Press the DEC button to decrease discharge pressure in 4 PSI increments.
Press and hold the DEC button to decrease the pressure at a faster rate equivalent to 2
increments per second.
Press the IDLE button to return the engine immediately to the normal idle speed.
10.13.9.4
Cavitation
If the water pump discharge pressure falls below 30 psi and the engine r/min rises a minimum of
400 r/min above the current setpoint for more than five seconds, the system considers cavitation to
have occurred. It takes the following actions:
The engine will return to idle.
The current engine speed and discharge pressure setpoints will be cleared.
The check engine light will illuminate and a cavitation code will be logged.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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