Detroit Diesel 13400 Outer Drive, West / Detroit, Michigan 48239 -4001
No.: 17 TS-12Rev
December 9, 2019
TO:
Service Locations
FROM:
Service Systems Development
SUBJECT:
GHG17 Heavy Duty Engine Platform 1-BOX
™ Aftertreatment System
(ATS) Wire Harness
ISSUE
For GHG17, the main Aftertreatment Control Module (ACM) harness shifted from a Daimler
Trucks North America (or vehicle OEM) part to a Detroit
™ part. There are two main issues with
the 1-BOX
™ ATS harness. Reference Figure 1.
Harness shows chaffing on the branch to the 21-pin connector and Soot Sensor
Harness and ACM show corrosion at the 21-pin connector
Figure 1
– GHG17 1-BOX™
ATS Wire Harness
These issues can cause various electrical fault codes such as:
MCM fault code SPN 1231/FMI 9 - ACM Message Not Received or has Stopped Arriving
CPC fault code SPN 625/FMI 9 - ACM PT-CAN DM1 Message Not Received or has
Stopped Arriving
CAUSE
The chaffing is caused by vibration and dirt collecting inside the harness conduit. The water
intrusion at the 21-pin connector is a secondary failure due to chafing and water entering the
harness wiring.
