New Holland NH 3100 – Engine ECU: CAN TSC1_AE Control - SOURCE LOW

A Controller Area Network (CAN) bus communication error where the Engine Control Unit (ECU) detects a low voltage or short-to-ground condition on the CAN bus circuit responsible for the 'TSC1_AE' (Torque Speed Control - Agricultural Equipment) message.

• T5000
• T6000
• T7000
• TL Series
• TLA Series
• TS Series
• TSA Series
• TM Series

1. 1

   Check for accompanying 'ghost' codes (NH 3096 or NH 3097) which can be generated due to normal shutdown timing differences between the Engine ECU and the XCM.

2. 2

   Perform a CAN Bus Resistance Test with the battery disconnected by measuring resistance across the CAN High and CAN Low pins at the diagnostic port (should read approximately 60 ohms).

3. 3

   Inspect the wiring harness routing between the XCM and the Engine ECU for chafing against the engine block or frame.

4. 4

   Inspect the ECU and XCM connectors for moisture, corrosion, or pushed-out pins.

1. 1

   Clear and Verify

   If the code only appears during machine shutdown and is accompanied by NH 3096/3097, clear the codes using a diagnostic tool. Run the machine to see if the code returns during normal operation. If it does not, no physical repair is needed (though a dealer software update for the ECU/XCM may resolve the timing mismatch).

2. 2

   Isolate the Short

   If the code is active during operation, disconnect the negative battery terminal.

3. 3

   Disconnect Modules

   Unplug the harness connectors at both the Engine ECU and the XCM to isolate the wiring.

4. 4

   Test for Ground Short

   Using a multimeter, test the CAN High and CAN Low wires for continuity to the chassis ground.

5. 5

   Repair Harness

   If a short to ground is found, trace the harness to locate the chafed wire. Repair the wire using weather-sealed butt connectors and heat shrink, or replace the affected harness section.

6. 6

   Clean and Reassemble

   Spray the ECU and XCM connector pins with electrical contact cleaner. Allow them to dry, apply a small amount of dielectric grease to the connector seals, and reconnect them.

7. 7

   Final Test

   Reconnect the battery, clear the fault codes, and start the tractor. Verify that the engine responds properly to throttle/torque requests and that the code does not return.