Fault Code: 3911 | SPN: 5848 | FMI: 9 · 3/7/2019 · • Connect the recommended Cummins electronic service tool or equivalent. Action • Use the recommended Cummins electronic

© 2008 Cummins Inc., Box 3005, Columbus, IN 47202-3005 U.S.A. Printed from QuickServe® Online.All Rights Reserved. Last Modified: 07-Mar-2019

File: 189-t06-3911 Page 1 of 21

ISX15 CM2350 X101

Fault Code: 3911 | SPN: 5848 | FMI: 9Aftertreatment 1 SCR Intermediate NH3 Sensor - Abnormal Update

Rate

1 Check for primary fault codes

2 Low battery voltage

2.1 Battery load test

2.2 Fuse/distribution panel check

2.3 Ground inspection

3 Aftertreatment intermediate NH3 sensor module voltage check

3.1 Aftertreatment intermediate NH3 sensor open circuit check

4 J1939 data link engine wiring harness voltage check 3 pin serviceconnector

4.1 OEM sensor voltage check

4.2 J1939 data link harness pin to ground short circuit

5 Fault Code 3911 triggered by a malfunction in the J1939 data link withmultiple OEM fault code

6 J1939 data link terminating resistance is incorrect

6.1 Engine wiring harness has incorrect J1939 terminating resistance

6.2 OEM wiring harness has incorrect J1939 terminating resistance

7 J1939 data link harness open circuit check

8 OEM terminating resistor ohms check for the J1939 data link


File: 189-t06-3911 Page 2 of 21

9 Incorrect terminating resistance in the J1939 data link by a J1939 datalinked component

9.1 J1939 wire resistance check at the crossover connector for eachcomponent

10 ECM calibration revision history check


File: 189-t06-3911 Page 3 of 21

1 Check for primary fault codes

Solution: S00000911

Verification

Conditions• Turn keyswitch ON.• Connect the recommended Cummins electronic service tool or equivalent.

Action• Use the recommended Cummins electronic service tool or equivalent to read the fault codes.

SpecificationBefore troubleshooting this fault code, troubleshoot any fault code that is active or has more than one inactive countwithin the last 25 engine operating hours from the following list: 1894, 2636Linked Solutions• None

Repair

• Perform a search on the appropriate fault codes.

Validation

• None


File: 189-t06-3911 Page 4 of 21

2 Low battery voltage

Solution: S00001110

Verification

Conditions• Turn keyswitch OFF.

Action• Visually inspect the batteries and the battery cable connections for corrosion.• Measure the voltage from the positive (+) battery terminal to the negative (-) battery terminal.• If this vehicle has been repaired within the last 30 days for the same fault code, then proceed to the Linked

Solutions section.Specification• If the battery voltage is not at least 12 VDC (12 volt systems) or 24 VDC (24 volt systems), then proceed to the

Linked Solutions section.• If the battery or battery cables show signs of corrosion or damage, then proceed to the Repair Section.

Linked Solutions• Battery load test (Refer to 2.1 of Solution Set [S00001379])• Fuse/distribution panel check (Refer to 2.2 of Solution Set [S00000753])• Ground inspection (Refer to 2.3 of Solution Set [S00000754])

Repair

Repair or replace only the components that were found to be out of specification.• Clean corrosion or tighten battery cable connections.• Charge or replace the batteries.

Validation

• Connect all components• Connect the recommended Cummins electronic service tool or equivalent.• Disable Fault Code• Operate the engine within the "Conditions for Clearing the Fault Code" found in the Overview section of the

troubleshooting procedure.• Verify that the fault code is no longer active.• Check ECM Calibration Revision History• Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision

number in the ECM.• Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration

Revision History Database for applicable changes related to this fault code.• Refer to ECM Calibration Revision History Database.


File: 189-t06-3911 Page 5 of 21

2.1 Battery load test

Solution: S00001379

Verification


Action• Disconnect the batteries from each other.• Connect a load tester separately to each battery.• Measure the voltage from the positive (+) battery terminal to the negative (-) battery terminal.

Specification• If the battery voltage while load tested is not at least 12 VDC (12 volt systems) or 24 VDC (24 volt systems) for

each battery, then proceed to the Repair section.Linked Solutions• None

Repair

• Charge or replace the batteries.

Validation






File: 189-t06-3911 Page 6 of 21

2.2 Fuse/distribution panel check

Solution: S00000753

Verification


Action• Visually inspect ECM battery supply fuses for damage, corrosion or loose connections.• Visually inspect aftertreatment battery supply fuses for damage, corrosion or loose connections.• Visually inspect the battery supply fuses under a microscope or a magnifying glass for micro cracks.

Fuses can be difficult to locate. Some applications utilize a fuse distribution box within the battery box while othersutilize inline fuses. There are instances where these will be located behind the battery box wrapped in a buddle ofwires next to the frame rail.Micro cracks most commonly occur near the bends on either side of the interior of the fuse.Specification• If damage, corrosion or cracks are found, then proceed to the Repair section.

Linked Solutions• None

Repair

• Replace the fuse.

Validation






File: 189-t06-3911 Page 7 of 21

2.3 Ground inspection

Solution: S00000754

Verification


Action• Visually inspect the ECM ground for damage, corrosion and loose connections.• Visually inspect the aftertreatment interface harness ground for damage, corrosion and loose connections.• Visually inspect the grounds for proper routing.

Specification• If damage, corrosion or incorrect routing of grounds are found, then proceed to the Repair section


Repair

• Clean or replace connections.

Validation






File: 189-t06-3911 Page 8 of 21

3 Aftertreatment intermediate NH3 sensor module voltage check

Solution: S00000909

Verification

Conditions• Turn keyswitch OFF.• Disconnect the aftertreatment SCR intermediate NH3 sensor module from the OEM wiring harness.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Turn keyswitch ON.• Measure the voltage from the aftertreatment intermediate NH3 sensor module battery voltage SUPPLY circuit and

the aftertreatment intermediate NH3 sensor module battery voltage RETURN circuit at the aftertreatmentintermediate NH3 sensor module wiring harness connector.

• Refer to the circuit diagram or wiring diagram for connector pin identification.Specification• Proceed to the next solution if voltage is within the following specification of battery voltage: 1 VDC• Proceed to the Linked Solutions section if the voltage is not within the following specification of battery voltage: 1

VDCLinked SolutionsClick on the link below:• Aftertreatment intermediate NH3 sensor open circuit check (Refer to 3.1 of Solution Set [S00001065])

Repair

• No additional action is required for this solution.

Validation

• None


File: 189-t06-3911 Page 9 of 21

3.1 Aftertreatment intermediate NH3 sensor open circuit check

Solution: S00001065

Verification

Conditions• Turn keyswitch OFF.• Disconnect the aftertreatment SCR intermediate NH3 sensor module from the OEM wiring harness.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Turn keyswitch ON.• Measure the voltage between the aftertreatment intermediate NH3 sensor module battery voltage SUPPLY pin of

the OEM wiring harness to engine block ground.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• A malfunctioning OEM wiring harness RETURN circuit has been detected if the voltage is within the following

specification of battery voltage: 1 VDC• A malfunctioning OEM wiring harness SUPPLY circuit has been detected if the voltage is not within the following

specification of battery voltage: 1 VDCLinked Solutions• None

Repair

Repair or replace only the components that were found to be out of specification.• Troubleshoot the OEM wiring harness, and all interconnects.• Replace the fuse.• Repair or replace the OEM wiring harness. Refer to Procedure 019-071.

Validation






File: 189-t06-3911 Page 10 of 21

4 J1939 data link engine wiring harness voltage check 3 pin serviceconnector

Solution: S00000594

Verification

Conditions• Turn keyswitch OFF.• Connect all SAE J1939 components.• Turn keyswitch ON.

ActionThe service tool datalink adapter can NOT be connected to the 3-pin J1939 datalink connector during this check.• Measure the J1939 voltage of the J1939 (+) wire to battery ground at the 3 pin connector for the J1939 datalink.

Refer to Procedure 019-417.• Measure the J1939 voltage of the J1939 (-) wire to battery ground at the 3 pin connector for the J1939 datalink.

Refer to Procedure 019-417.Specification• A malfunctioning wiring harness has been detected due to the J1939 data link circuit being shorted to a voltage

source if the voltage is greater than the following specification: 4.5 VDC• Proceed to the Linked Solutions section if the voltage is less than the following specification: 1 VDC• Proceed to the next solution if the voltage is within the following specification for both the SAE J1939 data link (+)

and SAE J1939 data link (-) circuit: 1 - 4.5 VDCLinked Solutions• OEM J1939 data link component isolation (Refer to 4.1 of Solution Set [S00003176])• Engine or OEM wiring harness shorted to ground (Refer to 4.2 of Solution Set [S00003331])

Repair

Repair or replace only the components that were found to be out of specification.• Repair or replace the engine wiring harness. Refer to Procedure 019-043.• Repair or replace the OEM wiring harness. Refer to Procedure 019-071.

Validation






File: 189-t06-3911 Page 11 of 21

4.1 OEM sensor voltage check

Solution: S00003176

Verification


Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Reconnect the crossover connector.

Inspect the following components if applicable:• Turn keyswitch ON.• Measure the J1939 voltage of the SAE J1939 data link (+) and SAE data link J1939 (-) wires at the variable

geometry turbocharger actuator engine wiring harness connector to battery ground while each component isdisconnected one at a time.

• Disconnect the aftertreatment outlet NOx sensor• Disconnect the aftertreatment DPF temperature sensor module.• Disconnect the aftertreatment SCR temperature sensor module.• Disconnect the aftertreatment intermediate NH3 sensor.• Disconnect the aftertreatment particulate sensor• Disconnect the aftertreatment diesel exhaust fluid tank level/temperature/quality sensor.• Disconnect the aftertreatment exhaust gas temperature sensor.• Disconnect the aftertreatment intake NOx sensor.

Specification• Proceed to the next Linked Solution if the voltage is not within the following specification: 1 - 4.5 VDC• A malfunctioning SAE J1939 data link component has been detected if the voltage is within the following

specification after the component has been disconnected: 1 - 4.5 VDCLinked Solutions• None

Repair

Repair or replace only the components that were found to be out of specification.• Replace the aftertreatment diesel exhaust fluid tank level/temperature/quality sensor.• Replace the aftertreatment exhaust gas temperature sensor module. Refer to Procedure 019-449.• Replace the aftertreatment particulate sensor Refer to Procedure 019-478.• Replace the aftertreatment outlet NOx sensor. Refer to Procedure 019-451.• Replace the aftertreatment intake NOx sensor. Refer to Procedure 019-463.• Replace aftertreatment DPF temperature sensor module. Refer to Procedure 019-449.• Replace the aftertreatment SCR temperature sensor module. Refer to Procedure 019-449.• Replace aftertreatment intermediate NH3 sensor. Refer to Procedure 019-479.

Validation






File: 189-t06-3911 Page 12 of 21

4.2 J1939 data link harness pin to ground short circuit

Solution: S00003331

Verification

Conditions• Turn keyswitch OFF.• Disconnect the 14 pin crossover connector from the OEM wiring harness.• Turn keyswitch ON.

ActionThe service tool datalink adapter can NOT be connected to the 3-pin J1939 datalink connector during this check.• Measure the J1939 voltage of the J1939 (+) wire to battery ground at the 3 pin connector for the J1939 datalink.

Refer to Procedure 019-417.• Measure the J1939 voltage of the J1939 (-) wire to battery ground at the 3 pin connector for the J1939 datalink.

Refer to Procedure 019-417.Specification• A malfunctioning OEM wiring harness has been detected if voltage is within the following specification with the 14

pin crossover connector disconnected: 1 - 4.5 VDC• A malfunctioning engine wiring harness has been detected if voltage is not within the following specification with

the 14 pin crossover connector disconnected: 1 - 4.5 VDCLinked Solutions• None

Repair

Repair or replace only the components that were found to be out of specification.• Repair or replace the engine wiring harness. Refer to Procedure 019-043.• Repair or replace the OEM wiring harness. Refer to Procedure 019-071.

Validation






File: 189-t06-3911 Page 13 of 21

5 Fault Code 3911 triggered by a malfunction in the J1939 data link withmultiple OEM fault code

Solution: S00000912

Verification

Conditions• None

Action• Reconnect the variable geometry turbocharger actuator to the engine wiring harness.• Reconnect the aftertreatment intake NOx sensor to the engine wiring harness.• Reconnect the crossover connector.• Turn keyswitch ON.• Connect the recommended Cummins electronic service tool or equivalent.• Use the recommended Cummins electronic service tool or equivalent to read the fault codes.

Specification• Proceed to the next solution, if any fault code is active or has more than one inactive count within the last 25

engine operating hours from the following list: 1894, 2636, 2771, 3232, 3868, 4151, 4152, 4572, 4677, 6688• A malfunctioning aftertreatment selective catalyst reduction sensor has been detected if a fault code from the

following list is not active, or does not have more than one inactive count within the last 25 engine operatinghours: 1894, 2636, 2771, 3232, 3868, 4151, 4152, 4572, 4677, 6688


Repair

• Replace aftertreatment SCR intermediate NH3 sensor module. Refer to Procedure 019-479.

Validation

• Check ECM Calibration Revision History• Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision


Revision History Database for applicable changes related to this fault code.• Refer to ECM Calibration Revision History Database.• Connect all components• Connect the recommended Cummins electronic service tool or equivalent.• Operate the engine within the "Conditions for Clearing the Fault Code" found in the Overview section of the

troubleshooting procedure.• Verify that the fault code is no longer active.


File: 189-t06-3911 Page 14 of 21

6 J1939 data link terminating resistance is incorrect

Solution: S00000593

Verification

Conditions• Turn keyswitch OFF.• Wait for 90 seconds.• Disconnect the INLINE adapter from the 3-pin service data link connector.• Reconnect the variable geometry actuator if it has been previously disconnected.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the 3-

pin service data link connector. Refer to Procedure 019-417.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• Follow your technical escalation process if the resistance is within the following specification: 54 - 66 ohms• Proceed to the Linked Solutions section if the resistance is not within the following specification: 54 - 66 ohms

Linked SolutionsClick on the link below:• Engine wiring harness has incorrect J1939 terminating resistance (Refer to 6.1 of Solution Set [S00000972])• OEM wiring harness has incorrect J1939 terminating resistance (Refer to 6.2 of Solution Set [S00000971])

Repair


Validation

• None


File: 189-t06-3911 Page 15 of 21

6.1 Engine wiring harness has incorrect J1939 terminating resistance

Solution: S00000972

Verification

Conditions• Turn keyswitch OFF.• Reconnect previously disconnected components.• Disconnect the INLINE adapter from the 3-pin service data link connector.• Disconnect the aftertreatment intake NOx sensor from the engine wiring harness.• Disconnect the engine wiring harness from the OEM wiring harness crossover connector.

Action• Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the 3-

pin service data link connector. Refer to Procedure 019-417.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• A malfunctioning engine wiring harness has been detected if the resistance is not within the following

specification: 108-132 ohmsLinked Solutions• None

Repair

• Repair or replace the engine wiring harness. Refer to Procedure 019-043.

Validation






File: 189-t06-3911 Page 16 of 21

6.2 OEM wiring harness has incorrect J1939 terminating resistance

Solution: S00000971

Verification

Conditions• Turn keyswitch OFF.• Disconnect the engine wiring harness from the OEM wiring harness crossover connector.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the

crossover of the OEM wiring harness connector. Refer to Procedure 019-417.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• Proceed to the next solution if the resistance is not within the following specification: 108 - 132 ohms• Follow your technical escalation process if the resistance is within the following specification: 108 - 132 ohms


Repair


Validation

• None


File: 189-t06-3911 Page 17 of 21

7 J1939 data link harness open circuit check

Solution: S00004534

Verification

Conditions• Turn keyswitch OFF.• Disconnect the appropriate data link component from the data link wiring harness.• Disconnect the engine wiring harness connector from the ECM.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Measure the resistance between the J1939 (+) pin at the appropriate component data link wiring harness

connector and the appropriate data link component J1939 (+) pin at the data link wiring harness ECM connector.• Measure the resistance between the J1939 (-) pin at the appropriate component data link wiring harness

connector and the appropriate data link component J1939 (-) pin at the data link wiring harness ECM connector.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• A malfunctioning J1939 data link wiring harness has been detected if the resistance is greater than the following

specification: 10 ohmsLinked Solutions• None

Repair

Repair or replace only the components that were found to be out of specification.• Repair or replace the OEM wiring harness. Refer to Procedure 019-071.• Repair or replace the engine wiring harness. Refer to Procedure 019-043.

Validation






File: 189-t06-3911 Page 18 of 21

8 OEM terminating resistor ohms check for the J1939 data link

Solution: S00000907

Verification

Conditions• Turn keyswitch OFF.• Disconnect the OEM terminating resistor from the OEM wiring harness.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Measure the resistance between the pins for the OEM terminating resistor.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• If the resistance is not between 108 ohms and 132 ohms, then malfunctioning OEM terminating resistor has been

detected.Linked Solutions• None

Repair

• For a malfunctioning OEM terminating resistor, replace the OEM terminating resistor.

Validation






File: 189-t06-3911 Page 19 of 21

9 Incorrect terminating resistance in the J1939 data link by a J1939 datalinked component

Solution: S00001002

Verification

Conditions• Turn keyswitch OFF.• Disconnect the engine wiring harness from the OEM wiring harness crossover connector.• Reconnect the OEM terminating resistor if previously disconnected.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.• Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the

crossover of the OEM wiring harness connector. Refer to Procedure 019-417.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• Proceed to the Linked Solutions section if the resistance is not within the following specification: 108 - 132 ohms

Linked Solutions• J1939 wire resistance check at the crossover connector for each component (Refer to 9.1 of Solution Set

[S00001003])

Repair


Validation

• None


File: 189-t06-3911 Page 20 of 21

9.1 J1939 wire resistance check at the crossover connector for eachcomponent

Solution: S00001003

Verification

Conditions• Turn keyswitch OFF.• Disconnect the engine wiring harness from the OEM wiring harness crossover connector.• Reconnect the OEM terminating resistor if previously disconnected.

Action• Inspect the pins and connectors for damage. Refer to Procedure 019-361.

Inspect the following components if applicable:• Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the

crossover of the OEM wiring harness connector for each component while disconnecting them one at a time.• Disconnect the aftertreatment outlet NOx sensor• Disconnect the aftertreatment temperature sensor module• Disconnect the aftertreatment particulate sensor• Disconnect the aftertreatment diesel exhaust fluid tank level sensor• Disconnect the aftertreatment diesel exhaust fluid temperature sensor• Disconnect the aftertreatment diesel exhaust fluid quality sensor.• Refer to the circuit diagram or wiring diagram for connector pin identification.

Specification• If the resistance was not within 108 ohms to 132 ohms and it becomes within the specification of 108 ohms to 132

ohms when the J1939 component was disconnected, then a malfunctioning J1939 component has been detected.Linked Solutions• None

Repair

Repair or replace only the components that were found to be out of specification.• Replace the aftertreatment diesel exhaust fluid tank level sensor.• Replace the aftertreatment diesel exhaust fluid temperature sensor.• Replace the aftertreatment diesel exhaust fluid quality sensor.• Repair or replace the engine wiring harness. Refer to Procedure 019-043.• Repair or replace the OEM wiring harness. Refer to Procedure 019-071.• Replace the aftertreatment outlet NOx sensor. Refer to Procedure 019-451.• Replace aftertreatment DOC temperature sensor module. Refer to Procedure 019-449.• Replace the aftertreatment particulate sensor Refer to Procedure 019-478.

Validation






File: 189-t06-3911 Page 21 of 21

10 ECM calibration revision history check

Solution: S00000443

Verification

Conditions• Connect all components.• Turn keyswitch ON.• Connect the recommended Cummins electronic service tool or equivalent.

Action• Use the recommended Cummins electronic service tool or equivalent to read the fault codes.• Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision

number in the ECM.• Compare the ECM code and revision number in the ECM to the calibration revision listed in the ECM calibration

revision history for applicable changes.Specification• If a calibration update for this fault code is available, the ECM calibration revision must be that revision or higher.


Repair

• Prior to downloading the ECM calibration, check to see that all job images and all other troubleshooting has beendocumented as downloading an ECM calibration will remove the fault codes on the ECM.

• Download the updated ECM calibration code. Refer to Procedure 019-032.

Validation





If all steps have been completed and no root cause has been identified, then follow the technicalescalation process.

Documents

Fault Code: 3911 | SPN: 5848 | FMI: 9 · 3/7/2019 · • Connect the recommended Cummins electronic service tool or equivalent. Action • Use the recommended Cummins electronic