Case IH 19393 – Engine Control Module (ECM / ECU): CAN-Receive-Frame Torque / Speed control from ADR to ECM through TSC1_SDR Message.

This is a Controller Area Network (CAN) communication timeout error. It indicates that the Engine Control Module (ECM/ECU) has stopped receiving the expected torque and speed control data (the TSC1_SDR message) from the ADR module, which may cause the machine to default to a derated or limp home mode.

• Tier 4b
• Case IH Puma
• STM N Series Loaders
• backhoes

1. 1

   Use the CNH Electronic Service Tool (EST) to check for other CAN timeout codes. If multiple modules are reporting missing messages, the entire CAN backbone may be compromised.

2. 2

   Inspect the wiring harness running between the ADR module and the ECM for chafing, pinch points, or melted insulation.

3. 3

   Disconnect the ECM and ADR connectors and inspect for pushed-back pins, corrosion, or moisture intrusion.

4. 4

   With the machine off and the battery disconnected, measure the resistance across the CAN High and CAN Low pins at the diagnostic port. A healthy CAN network should read approximately 60 ohms. If it reads 120 ohms, one of the terminating resistors has failed or there is an open circuit.

5. 5

   Verify that both the ECM and the ADR module are receiving proper operating voltage and have clean grounds. A module suffering from low voltage will drop off the CAN network and stop broadcasting its messages.

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery terminal to prevent electrical spikes.

2. 2

   Clean Connections

   If corrosion or moisture was found during the diagnostic checks, apply a high-quality electrical contact cleaner to the ECM and ADR harness connectors. Allow them to dry completely.

3. 3

   Repair Harness

   If the CAN wires (CAN High / CAN Low) are damaged, cut out the damaged section. Splice in new wiring using weather-sealed, heat-shrink butt connectors to maintain the integrity of the twisted pair data lines.

4. 4

   Replace Terminating Resistor

   If the resistance test failed (reading 120 ohms or open), locate and replace the faulty CAN terminating resistor on the network backbone.

5. 5

   Reassemble and Power Up

   Reconnect all modules and restore battery power.

6. 6

   Clear Codes

   Connect the CNH EST diagnostic tool and clear the inactive 19393 fault code from the ECM's memory.

7. 7

   Operational Test

   Start the engine and operate the machine through its gears/driveline functions to verify that the torque/speed control messages are being successfully transmitted and the code does not return.