CLAAS Id75C7h / 75C7h (308) – TR1 (A57-1): Reverse gear solenoid valve current > 1.4 A

The electrical current consumed by the reverse gear solenoid valve is greater than 1.4 A, which is the maximum allowable limit. This typically points to a short circuit in the wiring harness, a failed solenoid winding drawing excessive amperage, or a malfunctioning control module.

• Arion 640-510
• Arion 630-610
• Arion 420 CIS
• Axion 800
• Axion 850
• Ares 697 ATZ
• Ares 657

1. 1

   Verify if codes 301 or 302 are also present. If they are not shown, proceed to check the solenoid valve directly

2. 2

   Check for a possible 12V short circuit on the reverse gear solenoid valve power supply harness

3. 3

   Measure the resistance of the solenoid valve winding to see if it is internally shorted

4. 4

   Test the 'Auto 5' module using the specific CLAAS diagnostic tool (Tool n° 60 05 033 249)

1. 1

   Inspect Wiring and Connectors

   Check the connectors and the continuity of the harnesses linking the reverse gear solenoid valve to the TR1 (A57-1) transmission module.

2. 2

   Test for Shorts/Opens

   Use a multimeter to verify there are no short-circuits to 12V or open circuits in the wiring harness.

3. 3

   Check Power Sources

   Verify the sources of energy, including fuses, main power supply, and ground connections.

4. 4

   Measure Component Resistance

   Test the resistance of the reverse gear solenoid valve winding. If the resistance is out of specification (causing the current to spike above 1.4 A), the solenoid valve must be replaced.

5. 5

   Test the Control Module

   If the wiring and solenoid test fine, connect the CLAAS diagnostic tool (n° 60 05 033 249) to test the "Auto 5" module. Change the module if the tool indicates it has failed.

6. 6

   Clear Codes

   After replacing the faulty component, clear the codes. Note that an "ISC" reset is requested by the system for this fault family.