Case IH 18306 – ACML: ASP Aggressivity Switch CAN Signal Error

Indicates an error state with the CAN signal for the ASP Aggressivity Switch coming from the ACML. The system is detecting that the CAN bus communication regarding the aggressivity switch's position or state is invalid.

• VESTRUM CVX
• CVX 140
• CVX 150
• CVX 160
• CVX 175
• CVX 195
• Maxxum 115
• Maxxum 135
• Puma 150
• Puma 210
• Vestrum 100

1. 1

   Verify if the input signal from the Aggressivity switch has incorrect phasing or is permanently stuck on a steady voltage instead of the expected PWM duty cycle

2. 2

   Check for broader CAN Bus communication errors (e.g., 'CAN Bus OFF') that might be interrupting the signal from the ACML to the main tractor network

3. 3

   Inspect the wiring harness between the ASP (Armrest Switch Panel) and the ACML for line interruptions, short circuits to ground, or short circuits to +12V

4. 4

   Check if the switch signal has plausibility with the coupling sensor

1. 1

   Access ASP

   Access the ASP (Armrest Switch Panel) located on the tractor's multicontroller armrest.

2. 2

   Disconnect harness

   Disconnect the harness connecting the Aggressivity Switch to the ACML.

3. 3

   Test wiring continuity

   Using a multimeter, test the continuity of the wiring harness to rule out a short or open circuit. Repair any damaged wiring.

4. 4

   Test Aggressivity Switch

   Test the Aggressivity Switch itself for proper PWM signal output. If the switch is outputting a steady voltage or incorrect phasing, the switch (or the ASP panel it is housed in) must be replaced.

5. 5

   Replace ACML

   If the switch and wiring test good, the fault lies within the ACML (Armrest Control Module) failing to process or broadcast the CAN signal. Replace the ACML and reprogram/calibrate it to the tractor.