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Datalink Circuit – Control
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 411 PID: S249 SPN: FMI: 3 LAMP: Yellow SRT: 00-608 |
Data transmission error on control datalink pins 10 and 20 of sensor harness. |
Control device possibly does not work properly. |
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Control Datalink Circuit |
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Circuit Description
The purpose of the control datalink is to allow the ECM to communicate to the vehicle control-operated systems such as the transmission controllers, antilock brake system, etc.
Component Location
The control datalink circuit is located in the sensor wiring harness.
Shop Talk
Possible causes for this fault code include electromagnetic induction or radio noise (citizens band radio or linear amplifier), supply wire short to chassis ground, electromagnetic induction from control devices on the circuit, supply wire is on (also connectors), electromagnetic induction because of poor or no ECM grounding, return wire short to chassis ground, datalink wires (+, -) shorted together, reversed wires, supply wire is shorted to other wires, improper voltage on the datalink wires, and moisture is in the sensor port shorting circuit.
Cautions and Warnings
 CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking measurement: |
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CAUTION To reduce the possibility of damaging the new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
Troubleshooting Steps
| STEPS | SPECIFICATIONS | |
|---|---|---|
| STEP 1. | Check vehicle items. | |
| STEP 1A. Check for possible sources of interference. | Fault Code 411 active | |
| STEP 1B. Inspect 2-pin control datalink connector on both sensor side and harness side. | No damaged pins | |
| STEP 1C. Check for any control devices connected to control data link. | Fault Code 411 active | |
| STEP 2. | Check sensor harness and ECM. | |
| STEP 2A. Check for reversed wires. | Pin A: 4 to 5 VDC, Pin B: 0 to 1 VDC | |
| STEP 2A-1. Inspect the sensor harness and the ECM connector pins. | ||
| STEP 2A-2. Check voltage at ECM receptacle. | ||
| STEP 2B. Inspect the sensor harness and the ECM connector pins. | No damaged pins | |
| STEP 2C. Check for short circuit between control data link circuit and any other wires in sensor harness. | More than 100k ohms | |
| STEP 2D. Check for short circuit to ground. | More than 100k ohms | |
| STEP 3. | Clear the fault codes. | |
| STEP 3A. Disable the fault code. | Fault Code 411 inactive | |
| STEP 3B. Clear the inactive fault codes. | All fault codes cleared | |
Guided Step 1 – Check vehicle items.
| Guided Step 1A – Check for possible sources of interference. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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Fault Code 411 active |
Fault Code 411 inactive. |
| Guided Step 1B – Inspect 2-pin control data link connector on both sensor side and harness side. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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No damaged pins |
Repair the damaged pins.
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| Guided Step 1C – Check for any control devices connected to control data link. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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Fault Code 411 active |
Fault Code 411 inactive. |
Guided Step 2 – Check sensor harness and ECM.
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CAUTION To reduce the possibility of damaging the new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
| Guided Step 2A – Check for reversed wires. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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Pin A: 4 to 5 VDC, Pin B: 0 to 1 VDC |
Out of specifications. |
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CAUTION To reduce the possibility of damaging the new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
| Guided Step 2A-1 – Inspect the sensor harness and the ECM connector pins. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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No damaged pins |
Repair the damaged pins, |
| Guided Step 2A-2 – Check voltage at ECM receptacle. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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Pin 10: 4 to 5 VDC, Pin 20: 0 to 1 VDC |
Replace ECM. Refer to Procedure 019-031. |
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CAUTION To reduce the possibility of damaging the new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
| Guided Step 2B – Inspect the sensor harness and the ECM connector pins. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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No damaged pins |
Repair the damaged pins. |
| Guided Step 2C – Check for short circuit between control data link circuit and any other wires in sensor harness. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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More than 100k ohms |
Repair or replace the sensor harness. |
| Guided Step 2D – Check for short circuit to ground. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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More than 100k ohms |
Repair or replace the sensor harness. |
Guided Step 3 – Clear the fault codes.
| Guided Step 3A – Disable the fault code. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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Fault Code 411 inactive |
Return to troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all steps have been completed and checked again. |
| Guided Step 3B – Clear the inactive fault codes. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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All fault codes cleared |
Troubleshoot any remaining active fault codes. |
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Repair Complete
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Appropriate troubleshooting chart
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