New Holland 3157 – Vehicle Control Module: CAN Engine Timeout SCH Code

The system has detected a timeout in the CAN engine communication, indicating that a critical vehicle control module (such as the instrument cluster, transmission controller, or armrest controller) has lost communication with the Engine Control Module (ECM/ECU). This occurs when expected data is not received over the CAN bus for a specific period, suggesting the ECM is unpowered, disconnected, or has failed internally. This fault can result in a no-start condition, sudden engine shutdown, or erratic acceleration, often accompanied by a 'STOP engine' light.

• T6.155
• T7.200
• T7.210
• Boomer Series
• CR9040
• CR9060
• CR9070
• CR9080
• CR9090
• WM Series
• B110
• B115
• B95B
• D150B
• D85B
• F104B
• F170B

1. 1

   Check all fuses and relays related to the ECM and engine controls for blown fuses or faulty relays

2. 2

   Verify battery voltage and solid ground connections at the main ECM harness connector using a multimeter

3. 3

   Visually inspect the engine wiring harness and ECM connectors for abrasion, corrosion, or loose pins (perform a wiggle test to check for intermittent faults)

4. 4

   Perform CAN bus physical layer diagnostics with power OFF: measure termination resistance between CAN High and CAN Low (should be approximately 60 Ohms)

5. 5

   Check for shorts to ground by measuring resistance from CAN High to chassis ground and CAN Low to chassis ground (should be open circuit/mega-ohms)

1. 1

   Address basic electrical issues

   If diagnostic checks reveal power supply issues, clean corroded terminals, replace blown fuses, swap faulty relays, and secure loose power or ground connections to the ECM.

2. 2

   Repair wiring harness

   If wiring damage such as chafing or broken wires is found, repair the affected section. Ensure the repaired wire is properly insulated and secured to prevent future damage.

3. 3

   Isolate faulty module

   If CAN bus resistance is incorrect (e.g., 120 Ohms or very low) and wiring is intact, disconnect modules one by one from the CAN network and re-measure resistance to isolate the faulty component.

4. 4

   Replace the Engine Control Module (ECM)

   If all wiring, power, ground, and CAN bus checks pass, the fault is likely internal to the ECM. Replace the ECM with the correct unit for the machine's serial number. Note that the new unit will likely require programming or cloning to transfer vehicle-specific data.