0401-18 Service Bulletin/Repair Instructions

04 01-18
1
04 01-18
SUBJECT
DATE
SPN 1231 (MCM) (EPA10; GHG14)
April 2018
Additions, Revisions, or Updates

Publication Number / Title
Platform
Section Title
Change
DDC-SVC-MAN-0084
DD Platform
SPN 1231/FMI 9 EPA10 - GHG14
The procedure has been updated.
DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this newest version. To update the

tool troubleshooting guide, open DiagnosticLink and from the Help – Troubleshooting Guides menu, select the appropriate

troubleshooting manual, then click Update.
All information subject to change without notice.
04 01-18
Copyright © 2018 DETROIT DIESEL CORPORATION
3
2 SPN 1231/FMI 9 - EPA10 - GHG14
2
SPN 1231/FMI 9 - EPA10 - GHG14
Aftertreatment Control Module Message Not Received or Has Stopped Arriving

Table 1.

SPN 1231/FMI 9

Description
This Fault Code Sets when the Motor Control Module (MCM) Stops

Receiving Messages from the Aftertreatment Control Module (ACM)
Monitored Parameter
ACM Controller Area Network (CAN) Communication
Typical Enabling Conditions
Always Enabled
Monitor Sequence
None
Execution Frequency
Always Enabled
Typical Duration
Two Seconds
Dash Lamps
MIL is Solid, CEL and AWL Flash
Engine Reaction
30 Seconds Shutdown
Verification
Turn the Ignition OFF, disconnect the USB link from the 9-pin

connector. Wait Five Minutes, reconnect the USB link and

DiagnosticLink. Turn the Ignition ON and recheck for the fault code.
4
All information subject to change without notice.
Copyright © 2018 DETROIT DIESEL CORPORATION
04 01-18
04 01-18
Possible causes:

•

•

•

•

•

•
Over/under voltage supply to the ACM module

Fault set during a reprogram event

Loss of power to the ACM

Loss of ground to the ACM

Loss of ignition switch power to the ACM

Open in the CAN-H/Can-L communication circuit to the ACM
Tools Needed:

Table 2.

Part Number
Description
Wire /Shrink tube color
DKI470E16022-37
0.64mm x 0.64mm Probe
Red/Red
DKI470E16022-42
2.8mm x 0.8mm Probe
Light brown/Red
1. Connect DiagnosticLink®.

2. Have the Aftertreatment Control Module (ACM), Motor Control Module (MCM), Common Powertrain Controller

(CPC), Transmission Control Module (TCM) or Integrated Powertrain Predictive Controller (IPPC)/Integrated

Powertrain Module (IPM) been recently programmed?

a. Yes; Go to step 3.

b. No; Go to step 4.
All information subject to change without notice.
04 01-18
Copyright © 2018 DETROIT DIESEL CORPORATION
5
2 SPN 1231/FMI 9 - EPA10 - GHG14

3. Turn ignition OFF, close DiagnosticLink, and disconnect the USB link from the 9-pin connector. Wait five minutes,

reconnect the USB link and DiagnosticLink. Turn the Ignition ON and recheck for the fault code. Does fault code SPN

625/FMI 9 become active in the CPC?

a. Yes; Go to step 4.

b. No; the fault code was set during the reprogramming event. No further diagnostics or repairs are needed for this

fault.

4. Check for battery voltage fault codes. Are fault codes SPN 168/FMI any present in the modules?

a. Yes; diagnose the battery voltage fault codes.

b. No; Go to step 5.

5. Check for other communication fault codes; is fault code SPN 625/FMI 9 also present in the CPC?

a. Yes; Go to step 17.

b. No; Go to step 6.

6. Turn the ignition OFF.

7. Disconnect and inspect the ACM 21-pin electrical connector harness side. Refer to section "Electrical Connector

Inspection". Is there corrosion, damage, bent or spread pins?

a. Yes; Refer to section "Electrical Connector Inspection".

b. No; Go to step 8.

8. Measure the resistance between 3, 5, 6, 8, and 9 of the 21-pin ACM connector, harness side and battery ground. Are

the resistances less than five ohms for each pin?
a. Yes; Go to step 9.

b. No; repair the circuit between pins 3, 5, 6, 8, 9 and the circuit splice.

9. Measure the battery voltage directly at the batteries. Record the results.

10. Turn the ignition ON (key ON, engine OFF).

11. Measure the voltage on pins 11, 12, 14, 15, and 18 of the ACM 21-pin connector, harness side and battery ground. Is

the voltage measurement on pins 11, 12, 14, 15, and 18 within 0.5 volt of the battery voltage?
6
All information subject to change without notice.
Copyright © 2018 DETROIT DIESEL CORPORATION
04 01-18
04 01-18
a. Yes; Go to step 12.

b. No; repair the circuits in question.

12. Measure the voltage between pin 16 of the ACM 21-pin electrical connector, harness side and battery ground. Is the

voltage within 0.5 volt of the battery voltage?
a. Yes; Go to step 13.
All information subject to change without notice.
04 01-18
Copyright © 2018 DETROIT DIESEL CORPORATION
7
2 SPN 1231/FMI 9 - EPA10 - GHG14

b. No; repair the ignition power circuit between pin 18 of the ACM 21-pin electrical connector, harness side, and

fuse A in the Powernet Distribution Box (PNDB).

CAUTION: ELECTRICAL SHOCK

To avoid injury from electrical shock, use care when connecting battery cables. The magnetic

switch studs are at battery voltage.

13. Turn the ignition OFF and disconnect the batteries.

14. Measure and record the resistance between pin 10 and pin 20 of the ACM electrical connector component side. Is the

resistance between 115 and 125 ohms?
a. Yes; Reconnect the ACM 21-pin electrical connector and Go to step 15.

b. No; replace the ACM.

15. Disconnect and inspect the 18-pin Powertrain Starpoint electrical connector harness side. Refer to section "Electrical

Connector Inspection". Is there corrosion, damage, bent or spread pins?
8
All information subject to change without notice.
Copyright © 2018 DETROIT DIESEL CORPORATION
04 01-18
04 01-18
a. Yes; Refer to section "Electrical Connector Inspection".

b. No; Go to step 16.

16. Measure and record the resistance between pins 7 and 9 of the Starpoint electrical connector harness side. Is the

resistance within 1.5 ohms of the measurement taken in step 14?

a. Yes; replace ACM.

b. No; repair the CAN circuits between the powertrain Starpoint and the ACM.

17. Disconnect and inspect the CPC electrical connector #3. Refer to section "Electrical Connector Inspection". Is there

corrosion, damage, bent or spread pins?
All information subject to change without notice.
04 01-18
Copyright © 2018 DETROIT DIESEL CORPORATION
9
2 SPN 1231/FMI 9 - EPA10 - GHG14
a. Yes; Refer to section "Electrical Connector Inspection".

b. No; Go to step 18.

18. Measure and record the resistance between pin 19 and pin 21 component side. Is the resistance between 115 and 125

ohms?
10
All information subject to change without notice.
Copyright © 2018 DETROIT DIESEL CORPORATION
04 01-18
04 01-18
a. Yes; reconnect the CPC electrical connector and Go to step 19.

b. No; replace the CPC.

19. Disconnect and inspect the ACM 21-pin electrical connector harness side. Refer to section "Electrical Connector

Inspection". Is there corrosion, damage, bent or spread pins?

a. Yes; Refer to section "Electrical Connector Inspection".

b. No; Go to step 20.

20. Measure and record the resistance between pin 10 and pin 20 of the ACM electrical connector component side. Is the

resistance between 115 and 125 ohms?
a. Yes; reconnect the ACM 21-pin electrical connector and Go to step 21.

b. No; replace the ACM.

21. Multiply the resistance measurements from steps 18 and 20 together and record the results. Then add the resistance

measurements from steps 18 and 20 together. Finally divide the multiple results by the added results. Record your

results. Then Go to step 22.

EX: 118 ohms x 120 ohms = 14160

118 ohms + 120 ohms = 238

14160 / 238 = 59 ohms

22. Disconnect and inspect the MCM 21-pin electrical connector harness side. Refer to section "Electrical Connector

Inspection". Is there corrosion, damage, bent or spread pins?

a. Yes; Refer to section "Electrical Connector Inspection".

b. No; Go to step 23.

23. Measure and record the resistance between pins 13 and 19 of the Starpoint electrical connector harness side. Is the

resistance within 1.5 ohms of the measurement taken in step 21?

a. Yes; replace the MCM.

All information subject to change without notice.
04 01-18
Copyright © 2018 DETROIT DIESEL CORPORATION
11
2 SPN 1231/FMI 9 - EPA10 - GHG14

b. No; repair the CAN circuits between the MCM and the powertrain Starpoint.
12
All information subject to change without notice.
Copyright © 2018 DETROIT DIESEL CORPORATION
04 01-18

Bestseller No. 1

iCarsoft Bidirectional Scan Tool, CR Max OBD2 Diagnostic Scanner for All Vehicles, Full System 49 Resets+46 Extra Services, 40000+Active Tests,ECU Coding, Battery Registration, Oil Reset/ABS,CAN FD

WHY CHOOSE THE 2025 CR MAX -Upgrade the latest diagnostic capabilities for all vehicles after 1996: upgrade to 49+maintenance services; 46 extra specific functions; real all systems/all control modules diagnose; over 40K+ bidirectional actuation tests for diagnosing all control moduels of cars; Powerful full OBD2 Functions; built-in ECU Coding for BMW/ Audi/ VW/ RollsRoyce; Fr ee V.A.G Guide Function; Battery retistration for new battery adaptation and more. It covers all vehicle diagnostic services and some special professional vehicle maintenance servces, assists you to do home DIY vehicle maintenance or car repair as a pro technician.
NEWEST IN INNOVATION FULL OBD2 SERVICES- iCarsoft auto car diagnostic scanner compatible with CAN-FD, CR MAX can do it all-reads and clears trouble codes, ALL SYSTEM DIAGNOSIS such as engine, transmission, ABS and airbag etc. CR MAX code reader for all cars can perform I/M Readiness, Live Data, Freeze Frame, Vehicle Information, Monitor Test, On-Board Monitor, E vap System Test,O2 Sensor Test,DTC Library Lookup,etc. (Warm Tips: If you car is after 2023,please contact us for compatibility; 3. It comes with 16PIN OBD2 diagnostic adapter, please check your car diagnostic socket if it is 16pin socket, if your car is 14pin diagnostic socket please contact us for the solution.)
49 RESET+ 46 SERVICES- Performs: Oil Reset, EPB,SAS,Throttle, D-P - F, Battery, ABS, Injector, TPMS, Suspension, AC, Head Lamp, Body Stablity, Engine, Tramsmission, Airbag, Seat, Door-Win-Roof, Fuel Pump, Door, E-G- R.+21 NEWEST SERVICES( Need update scanner)-AdBlue, Clutch, Crankshaft, High Voltage Battery, Cruise Control, NO xSensor, Rain Sensor, Stop And Start, Turbocharger, Head Up Display, Radar Camera, Vehicle Setup, Cyliner Misfire Check,Speedlimitassist, ControlUnitReset,OxygenSensor, Seatbelt. Extra 46+ extra services based on car brand.(Tips: Quantity of reset/ calibration fucitons are based on car system that your vehicle model has)
REVOLUTIONARY 40000+BIDIRECTIONAL ACTIVE TESTS: Upgraded CR Max scanner equip with numberous of actuational test items for covering all available vehicle control modules, no longer only do simple light test or window test like other scanners, performs hardware modules test and software control modules test for checking car units or new updated control moduels work well or not after maintenance/ repair/ re-installation/ control system updated (Example for Benz- Roller Sun Blind test; Backup Camera test ;Self-test; EPB test; Transport Mode test;Boost Pressure Positioner test; Fuel Pump test; AND MORE!!).(Warm tip: The available test items are based on control modules your car has)
ECU CODING+ BATTERY REGISTRATION- Powerful ECU Coding service for BMW/MINI/RollsRoyce / Audi/VW/Seat/Skoda/Bentley/Bugatti/Lamborghini, Improves Engine Power Performance and Optimizes Fuel Efficiency and Match New Hardware Unit to car and Customized a comfortable Driving Modes and Fixes & Updates Original Software Bug. The battery test function for checking car battery health, perform battery reset (BMS ) for replacing a damaged or aging car battery with a new one and register new battery to car ECU

SaleBestseller No. 2

iCarsoft Auto Diagnostic Scanner POR V2.0

Scanner POR V2.0 with all obd2 services
Do the scanning for engine
Support OBDII/EOBD Ten Modes of Operation

SaleBestseller No. 3

iCarsoft Bidirectional Diagnostic Tool for Most Mercedes-Benz/Sprinter/Smart from 1996-2023 MB V3.0 2026 Version Up to 38 Service Full System OBD2 Scanner All Test AutoVIN Battery Test Free Update

【Designed for Most Mercedes-Benz, Sprinter and Smart from 1996-2023】As every car model of Benz has its-owned specific car system and ECUs, not all models are equipped with a complete vehicle ECU, which may cause the scanner to be unable to perform all listed reset services on some models, or even completely incompatible. Like For Sprinter's newer models, it support diagnostic functions only, lacking support for specialized service functions.. So please tell us the car's VIN and required service before purchase for compatibility check. You may also refer to the instructions in the eighth image of the main product photos to perform your inquiry.
【Up to 38 Reset Services】MB V3.0 2026 Version diagnostic tool performs Up to 38 maintenance services - Oil Rest , SAS, EPB, ETC, D-P-F, TPMS, ABS, Suspension, Air Conditioner, Head Lamp, Body Stability, Engine Control, Seat, Fuel Pump, Air-Filter, Engine Idle, Door, Im-mo-bilizer, Injector Coding, Transmission Control, Miscellaneous, Adblue, BMS, Cluth, Water Pump, NOxSensor, Rain/Light Sensor, Start/Stop, Radar/Camera, Cylinder Shutoff Test, Speed Limit Assist, Control Unit Reset, Oxygen Sensor, Seat Belt, Cruise Control System, Turbocharger, Crankshaft, Language Setting and etc. (Tips: Please update the software after receiving the product to obtain new service functions)
【OE-Level All System OBD2 Scanner】iCarsoft MB V3.0 (2026 Version) diagnostic scanner offers comprehensive OBDII services, allowing you to quickly scan all systems, including the Engine, ABS, SAS, SRS, TPMS, TCM, Fuel Pump System, ESP, EPB, EPS, Suspension, SCM, Adaptive Systems, and more. It supports functions such as reading and erasing codes, checking I/M readiness, viewing freeze frame data, performing O2 sensor tests, conducting on-board monitoring, testing the evap system, auto VIN retrieval, and reading both generic and specific codes, as well as DTCs and battery tests.
【Bidirectional Scan Tool】iCarsoft MB V3.0 (2026 Version) Bidirectional scanner supports activate or control a vehicle system or component, allows commanding cars’ modules and receiving info from the ECU to perform active tests on individual components, including EVAP/ABS Motor Pump/Windows/Sunroof and more, to pinpoint fault causes & resolve issues,and allows you to re-learn certain components after making repairs or replacement.
【Real Time Record & Graph View】iCarsoft MB V3.0 (2026 Version) can automatically record vehicle text history and identify vehicle information. Preserve real-time data information. View & Graph Live Data. Support Data Review and Print. Multi-language: English, German, Dutch, Spanish, French and so on. We promise to offer Lifetime updates (Lifetime free Update via PC), and confidence in products. We also provide 1 year warranty + extra lifetime hardware free repair if you need it in the future. We prioritize user experience & strive to meet your expectations. Please do feel free to reach out to us if you have any question or problem about the usage, our tech team will service you in time.

This product presentation was made with AAWP plugin.

Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API

Buffer Email Facebook Flipboard Hacker News LinkedIn Messenger Mix Pinterest Print Reddit SMS Telegram Tumblr X VK WhatsApp Line Xing Threads Bluesky Copy Mastodon Nextdoor