IK1200926 ­ ACM and DSI Troubleshooting

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Title : ACM and DSI Troubleshooting
Applies To : 2010 and 2013 Emission MaxxForce DT, 9 & 10
CHANGE LOG
6/3/14 - Changed wording of step 5
5/13/14 - Added step based diagnostics, revised parts list / verified stock
3/10/14 - Brand new article

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

DESCRIPTION
This document is for troubleshooting the Aftertreatment Control Module(ACM) and Down Stream Injection(DSI) assembly on the 2010 and 2013
emissions MaxxForce DT/9/10 engines.

NOTE: Before the ACM or DSI is ever replaced it should be thoroughly diagnosed. A majority of concerns are found to be wiring and connection
issues.

SYMPTOM
Intermittent or active codes associated with the ACM or DSI assembly

Diagnostic Trouble Codes
The following is a list of the most frequent codes that are a result of wiring or connection issues:
DTC

Description

3471-10

AFT Fuel Doser Valve Abnormal Rate of Change

3480­3

AFTFP1 signal Out of Range HIGH

609­19

ACM not detected on J1939

3471­7

AFT Fuel Doser Valve Not Responding as Expected

3479­4

AFT Fuel Doser Valve Short to Ground

3482­4

AFT Fuel Shutoff Valve Short to Ground

Customer Complaint
- Check engine lamp (aftertreatment codes)
- Unit will not perform a regen (parked or rolling)
- Low power/de-rate (active 3719 codes)

DIAGNOSTICS
The ACM and DSI assembly should be thoroughly diagnosed before one is ever replaced. A majority of units with these codes are found to
have wiring issues with the module or assembly. The following steps highlight areas that should be checked for wiring or connection issues.

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IK1200926 ­ ACM and DSI Troubleshooting

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Figure # 1: MaxxForce DT/9/10 Aftertreatment wiring diagram

Step 1: DSI connector inspection

The four connectors at the DSI assembly (AFTFP1, AFTFP2, AFTFD, AFTFIS)
should be checked for lose or broken pins. Verify connector pins are making proper Yes: Continue to Step 2.
contact by performing a pin drag test. Each of the four connectors should snap
No: Replace any connectors or pins that do not make secure
securely into place, if not then check for cracked connectors.
connections. Retest and verify aftertreatment fault does not
Are all four connectors and pins properly secured?
return.

Step 2: ACM/DSI wiring inspection

Wiring from the ACM to DSI should be inspected for any chafing and that its
properly routed. Also inspect the powers and grounds for any issues. If the issue is
centralized on a particular wire or circuit then it should be load tested and wiggled to Yes: Continue to Step 3.
pinpoint the issue.
No: Correct any wiring issues and make sure it is properly
routed. Retest and verify aftertreatment fault does not return.
Is wiring intact and properly routed?
*See figure #2

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IK1200926 ­ ACM and DSI Troubleshooting

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Figure #2: Harness chafing(incorrectly routed)

Step 3: ACM connector inspection

The ACM 86­Pin, 53­pin and the 24­Pin Engine/IP connector should be inspected
for connection issues at the pins. A weak pin or one that is not fully snapped into
the connector can create intermittent codes from engine vibration or road feedback. Yes: Continue to Step 4.
By removing the connector comb you can easily inspect pins and check their crimp
No: Replace any connector pins that do not make a good
on the wire.
connection or properly snap into the connector. Retest and
verify aftertreatment fault does not return.
Do all connector pins make a secure connection?
*See figure #3

Figure #3: Connector Inspection(ACM 86-Pin)

Step 4: Verifying ACM communication

For issues with the Controller Area Network (CAN) bus reference IK0800080.
Ensure the ACM is communicating on the CAN bus and has ignition power
when turned on. Using servicemaxx, the ACM will show up on the sniffer if it is
communicating. Check wiring and splices for any power supply issues. If the ACM
is not properly powered up it will not communicate on the bus.

Yes: Continue to Step 5.
No: Find and correct the wiring or connection issue. Retest
and verify aftertreatment fault does not return.

Does the ACM power up and communicate on the CAN bus?

Step 5: Verify fault codes

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Retest for the aftertreatment fault and verify that it is still a current issue (faults have been corrected by disconnecting and reconneting connectors
that had a bad/dirty connection). If all diagnostics have been completed and the fault code continues to return then a new ACM should be installed
(If available try a test ACM first). Verify the fault codes do not return after replacing the module.

Component Location
ACM - Is installed underneath the cab just below the drivers floorboard
DSI Assembly - Is on the left side of the engine, to the rear of the fuel filter module

Diagnostic Manual Updates
Follow the Engine Diagnostic Manual(click here) for proper voltage and wiring specifications. The information below has been updated from the
manual.
Updated ACM Voltage Referance (VREF)
‐ ACM P/N 1890993C1, KOEO voltage referance is 6V
‐ ACM P/N 7085804C1, KOEO voltage referance is 12V
‐ ACM P/N 7094050C1, KOEO voltage referance is 12V

SERVICE PARTS INFORMATION
- ACM Connector Part Numbers
ACM 53-Pin connector

ACM 86-Pin connector

Terminal 16GA

3710403C1

N/A

Terminal 20GA

3710402C1

3710402C1

- 24-Pin Engine/IP Connector Part Numbers
24-Pin(Female)

Terminal 20GA
(cavities 5-10 & 15-19)

3860055C1

Connector Body

3857801C1

- DSI Connector Part Numbers
AFTSV 2-Pin connector

AFTFP2 3-Pin connector

AFTFD 2­Pin connector

AFTFIS 4-Pin connector

Terminal 18GA

3689960C1

3689959C1

3689960C1

3689959C1

Connector Body

Located in harness repair kit

Located in harness repair kit

Located in harness repair kit

Located in harness repair kit

WARRANTY INFORMATION
Warranty Claim Coding

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IK1200926 ­ ACM and DSI Troubleshooting

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Group: 1200 - ENGINES
Noun:

1010 - Harness Aftertreatment Wiring

Standard Repair Time
Description

SRT Link

Hours

Wiring Repair(s)

A08­2004A

0.8

OTHER RESOURCES
MaxxForce DT/9/10 Diagnostic Manual
Aftertreatment Diagnostic Manual (I6/BB)
MaxxForce DT/9/10 Wiring Schematic
J1939 Data Link Troubleshooting

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You received the following feedback From: u022453 - Chris Moran Email Address: SMTP:{Chris.Moran@navistar.com}Chris.Moran@navistar.com Feedback: Where 7/1/2014 9:17:21
is the ACM on the RE, CE and AE (in fact on all) buses?
AM

Copyright © 2014 Navistar, Inc.

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