DDEC TROUBLESHOOTING
61.3 TROUBLESHOOTING FLASH CODE 61
The following procedure will troubleshoot Flash Code 61.
61.3.1
Test Alternator Ground
Perform the following steps to test alternator ground.
1. Disable the alternator by removing the alternator belt.
2. Start and run the engine; warm to greater than 87
F (30
C).
3. Does the code return?
[a] If Flash Code 61 does not return, repair or replace the alternator grounds and
refer to section 61.3.5.
[b] If the code(s) return, refer to section 61.3.2.
61.3.2
Determine Cylinders With Fault
The injector location that is logging the codes is listed in Table 61-1.
#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 61-1
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 1,000 , replace the ECM.
Refer to section 61.3.5.
[b] If all terminals have a resistance of greater than 1,000 , refer to section 61.3.3.
61.3.3
Check for Short
Perform the following steps to check for a short.
1. Locate the injector harness connector terminals associated with the codes. See Figure 61-2.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
61-5
