Figure 1 GHG17 1- ATS Wire Harness

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No.: 17 TS-12RevDecember 9, 2019TO:Service LocationsFROM:Service Systems DevelopmentSUBJECT:GHG17 Heavy Duty Engine Platform 1-BOX Aftertreatment System(ATS) Wire HarnessISSUEFor GHG17, the main Aftertreatment Control Module (ACM) harness shifted from a DaimlerTrucks North America (or vehicle OEM) part to a Detroit part. There are two main issues withthe 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 connectorFigure 1 – GHG17 1-BOX ATS Wire HarnessThese 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 hasStopped ArrivingCAUSEThe chaffing is caused by vibration and dirt collecting inside the harness conduit. The waterintrusion at the 21-pin connector is a secondary failure due to chafing and water entering theharness wiring.Detroit Diesel 13400 Outer Drive, West / Detroit, Michigan 48239-4001

17 TS-12Rev-2-12/9/2019REQUIRED ACTIONAnti-chaffing tape should be applied to the current ATS harness, or to a new replacementharness if it does not have the tape. See the Repair Procedure section for instructions oninstalling the tape.REQUIRED MATERIALIf the harness needs replacing, the current production and service ATS harness is P/N:A4721504320. It superseded former P/N: A4721503620 with approximate ATS S/N:1240000769034 at the truck plants in July, 2017. The new harness has anti-chaffing tape underthe loom. Either part number is acceptable to use in a repair. Refer to the eParts Catalog onddcsn.com with the specific engine serial number to verify the correct ATS harness partnumber.If repairing or installing harness P/N: A4721503620, portions of the harness will need to bewrapped with anti-chaffing tape such as DTNA P/N: 48-25910-003 or commercially availabletape, Coroplast 832 MPX. The DTNA tape is 82’ long x 1” wide, and is enough for multiplevehicles. See the Repair Procedure section for instructions on installing the tape.REPAIR PROCEDUREFollow the procedure below.ELECTRICAL SHOCKTo avoid injury from electrical shock, use care when connecting battery cables. Themagnetic switch studs are at battery voltage.1. Shut off engine and apply the parking brake, chock the wheels, disconnect vehicle batterypower, and perform any other applicable safety steps.2. If necessary, remove the passenger side fairing. Refer to OEM procedures.3. Allow the ATS time to cool.

17 TS-12Rev-3-12/9/20194. Remove the six bolts securing the ACM protective cover to the ATS. Reference Figure 2.Figure 2 – ACM Cover5. Note the location of the zip ties securing the wiring harness to the ATS and the harnessrouting location. Remove the zip ties securing the wiring harness to the ATS. ReferenceFigure 3.Figure 3 – Harness Routing and Zip Tie Location

17 TS-12Rev-4-12/9/20196. Remove the following plastic connector clips. Reference Figure 4. Two 90-degree elbows Three T-fittings 21-pin connector fitting Soot Sensor fittingFigure 4 – Harness Clip Removal7. Remove the convoluted tubing using scissors or tool DKI0CHA17002-13 from the ChassisTerminal Extraction Tool Kit DKI0CHA17002. Take care not to cut the wire harness. DONOT USE A RAZOR BLADE. If using the Harness Fiber Tape Wrap Cutting Tool, use thesharp end to make an incision in the tubing, and then insert the blunt end to cut the tubing.Reference Figure 5.Figure 5 – Harness Fiber Tape Wrap Cutting Tool

17 TS-12Rev-5-12/9/20198. Carefully remove all convoluted tubing shown in red below. Reference Figure 6.Figure 6 – Convoluted Tubing Removal9. Inspect all exposed wires for damage or corrosion, looking carefully for wire insulation thathas worn through, exposing the wire core. Is there exposed wire core? Reference Figure 7.a. Yes; replace the ATS harness. Reference the removal and installation sections for the 1BOX Aftertreatment Harness in the GHG17 Heavy Duty Workshop Manual (DDC-SVCMAN-0190). Instructions for adding anti-chaffing tape are further below. Go to step 11.b. No; go to step 10.No wire core exposureFigure 7 – Wire Harness InspectionWire core exposure-REPLACE harness

17 TS-12Rev-6-12/9/201910. Inspect the ATS harness 21-pin and 120-pin connectors for excessive corrosion. ReferenceFigure 8. Is excessive corrosion present at one or both connectors?a. Yes; replace the ATS harness. Reference the removal and installation sections for the 1BOX Aftertreatment Harness in the GHG17 Heavy Duty Workshop Manual (DDCSVC-MAN-0190). Instructions for adding anti-chaffing tape are further below.b. No; the harness will be reused.Figure 8 – ATS Harness 21-pin and 120-pin Connector Inspection11. Inspect the ACM 21-pin and 120-pin connectors for excessive corrosion. Reference Figure9. Is excessive corrosion present at one or both connectors?a. Yes; replace the ACM. Reference the removal and installation sections for the 1-BOX Aftertreatment Control Module in the GHG17 Heavy Duty Workshop Manual (DDC-SVCMAN-0190). Go to step 13.b. No; go to step 12.Figure 9 – ACM 21-pin and 120-pin Connector Inspection

17 TS-12Rev-7-12/9/2019EYE INJURYTo avoid injury from flying debris when using compressed air, wear adequate eyeprotection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) airpressure.12. If light corrosion is present in the ACM 21-pin and 120-pin connectors, clean them withcommercially available electrical contact cleaner and an insulative nylon brush such asTechni-Stat Insulative Brush P/N: 758PR499 (reference Figure 10) or Techni-Tool ESDBrush P/N: 758PR121. Gently blow out the connector with compressed air until dry.Figure 10 – Insulative Nylon Brush used for Connector Cleaning13. If reusing the existing ATS harness or installing a new ATS harness P/N: A4721503620,install anti-chaffing tape around all exposed wires as shown in Figure 11. Overlap the tapeby 50% and proceed to step 14. If installing a new ATS harness P/N: A4721504320, notethat it already comes with anti-chaffing tape under the loom and proceed to step 15.Figure 11 – Anti-Chaffing Tape Installation

17 TS-12Rev-8-12/9/201914. Reinstall the convoluted tubing and install existing elbows, tees and connector fittings. Fullyapply electrical tape around the convoluted tubing. Reference Figure 12.Figure 12 – Tape Installation15. Connect the 120-pin and 21-pin electrical connectors and make sure the latches are fullyclosed. Connect the soot sensor electrical connector. Install new zip ties in the originallocations, securing the harness to the ATS. Reference Figure 13.Figure 13 – Zip Tie Location

17 TS-12Rev-9-12/9/201916. Install the ACM protective cover and hand-tighten the bolts. Torque the bolts to 10 N·m (7.4lb·ft). Reference Figure 14.Figure 14 – ACM Cover InstallationCLAIM PROCESSNormal Detroit in-warranty procedures apply. Proactive installation of the tape or ATSharness replacement is not allowed under warranty.If a mechanical failure is found in warranty, file the claim as follows: Claim type: 1 (base warranty) or 2 (extended coverage) Primary Failed Part: A4721503620 Fault type: 22 Parts return: RequiredTroubleshooting may include the following labor operations: Labor Operation SRT939-6225D, Computer Hook Up Used In Diagnostics Labor Operation 3RB-000EE, MCM/CPC/ACM/TCM Diagnostics-Difficult Labor Operation 246-6130E, ATS-After Treatment Device Harness R&R (One Box ATS) Labor Operation 246-6133E ATS-After Treatment Device Harness Anti-Chaffing TapeInstallation (Harness Installed On Vehicle) Labor Operation 246-6134E ATS-After Treatment Device Harness Anti-Chaffing TapeInstallation (Harness Removed From Vehicle) Labor Operation 246-6195E, ATS-ACM (Aftertreatment Control Module) R&R (Ifneeded/replacement) Admin Labor Operation 939-6010B

17 TS-12Rev- 10 -CONTACT INFORMATIONPlease contact the Detroit Customer Support Center at 800-445-1980 or emailcsc@daimler.com if you have any questions.12/9/2019

BOX Aftertreatment Harness in the GHG17 Heavy Duty Workshop Manual (DDC-SVC-MAN-0190). Instructions for adding anti-chaffing tape are further below. b. No; the harness will be reused. Figure 8 – ATS Harness 21-pin and 120-pin Connector Inspection 11. Inspect the ACM 21-pin and 120-pin connectors for excessive corrosion. Reference Figure 9.

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