DDEC TROUBLESHOOTING
[c] If the Eng Brk Svc Brk indicate No, and Eng Brk Min mph indicate 0,
refer to section 10.10.6.
10.10.6 Check Engine Brake Operation
Perform the following steps listed in Table 10-11 to check out the brake and clutch switch, and
the wiring.
NOTE:
If table below leads to section 10.11, troubleshoot clutch and brake inputs. Then check
operation of engine brake. If engine brake is still inoperative, refer to section 10.10.7.
1. Turn ignition ON. Engine must not be running.
2. Plug in DDR. Select switch/light status.
Step
Brake Pedal
Clutch
Pedal
DDR
Readout
Looked At
DDR
Display
Status OK
1.
Released
Released
Service Brake
(Release)
On Off
Yes No
refer to Step
2 refer to
section 10.11
2.
Depressed
Released
Service Brake
Release
On Off
No Yes
refer to
section 10.11
refer to Step 3
3.
Released
Released
Clutch
Release
On Off
Yes No
refer to Step
4 refer to
section 10.11
4.
Released
Depressed
Clutch
Release
On Off
No Yes
refer to
section
10.11refer
to section
10.10.7
Table 10-11
Engine Brake Operation
10.10.7 Check Brake Solenoids
Perform the following steps to troubleshoot the brake solenoids:
1. Check engine brake solenoids. Refer to OEM guidelines.
[a] If solenoids are okay, refer to section 10.10.8.
[b] If solenoids are bad, repair or replace the solenoids. Refer to section 10.10.9.
10.10.8 Verify Conditions
Perform the following steps to verify conditions:
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
10-45
