DDEC TROUBLESHOOTING
71.3 TROUBLESHOOTING FLASH CODE 71
The following procedure will troubleshoot Flash Code 71.
71.3.1
Determine Cylinders With Fault
The injector location that is logging the codes is listed in Table 71-1.
#1
#2
#3
#4
#5
#6
(SID 1)
(SID 2)
(SID 3)
(SID 4)
(SID 5)
(SID 6)
S55/60
1
5
3
6
2
4
cyl #
S50
1
3
4
2
-
-
cyl #
Table 71-1
Determine Cylinders With Fault
1. Disconnect the 5-pin injector harness connector at the ECM for those injectors logging
the codes.
2. Establish a good ECM case ground by measuring the resistance across two points on the
ECM. The resistance should measure less than or equal to 1 .
3. Once a good case ground is established, keep one of the measurement probes in place and
move the other probe to one of the five exposed male injector terminals on the ECM.
4. Measure the resistance. Repeat this procedure at each of the five terminals.
[a] If any terminals have a resistance of less than 1000 , replace the ECM.
Refer to section 71.3.5.
[b] If all terminals have a resistance of greater than 1000 , refer to section 71.3.5.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
71-5
