ENGINE BRAKE INOPERATIVE
10.10.3 View Diagnostic Data Reader Display
Perform the following steps to troubleshoot the inoperative engine brake:
1. View DDR display.
Set brake dash switch position on medium.
[a] If Eng Brake Low is OFF and Eng Brake Med is ON, refer to section 10.9.5.
[b] If Eng Brake Low is ON and Eng Brake Med is ON, medium and low inputs are
shorted to each other. Repair. Refer to section 10.10.9.
[c] If Eng Brake Low is ON and Eng Brake Med is OFF, input wires are reversed.
Correct and refer to section 10.10.9.
[d] If Eng Brake Low is OFF and Eng Brake Med is OFF, refer to section 10.10.4.
10.10.4 Check for Open
Perform the following steps to check for an open:
1. Turn ignition OFF.
2. Turn engine brake switch to low.
3. Measure resistance between the engine brake low switch and a good ground (ECM side).
4. Set switch to Med. Measure resistance between medium input and a good ground.
[a] If the measured resistance is less than 10,000 , either the switch is bad or the wire
from the switch to the battery ground is bad. Replace the switch or repair the open.
[b] If the measured resistance is greater than 10,000 , or open, an open exists in the
input wire. Repair the open. Refer to section 10.10.9.
10.10.5 View Calibration - Engine Configuration
Perform the following steps to view calibration - engine configuration:
1. Go to View Cal-Eng Configuration. Check status of Eng Brk Serv Brk and Eng Brk mph.
If Eng Brk Serv Brk indicates YES, or Eng Brk Min mph has number other than "0",
check with the operator to ensure he or she understands how these functions operate.
[a] If the Eng Brk Serv Brk indicates YES, the application of service brake is required
for engine brake operation.
[b] If the Eng Brk Min mph has a number other than "0", the brakes will not operate
below this mph.
These two functions may work separately or together.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION