Massey Ferguson 03.X.9A – TECU: High Amp Draw On Auxiliary Valve Switch 8 (TECU)

The control module is detecting an abnormally high electrical current on the circuit for the 8th auxiliary valve switch, typically pointing to a short circuit to ground (0 V) or an internally shorted switch.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Check the wiring harness connected to Auxiliary Valve Switch 8 for a short circuit to 0 V (ground).

2. 2

   Inspect the switch and its connectors for physical damage, melted plastic, or internal shorts causing the high amperage draw.

3. 3

   Verify the connections at the TECU module to ensure no pins are damaged, corroded, or shorted.

1. 1

   Locate the Switch

   Locate Auxiliary Valve Switch 8. Depending on your tractor's specific configuration, auxiliary spool valve switches are typically located on the armrest Multipad joystick or externally on the rear fenders.

2. 2

   Disconnect and Inspect

   Disconnect the wiring harness from the switch. Inspect the connector and the wiring loom for signs of chafing, rubbing, or shorting to the tractor's chassis.

3. 3

   Repair Wiring

   If the wiring is damaged and shorting to ground, repair or replace the affected section of the harness.

4. 4

   Replace the Switch

   If the wiring is intact and tests fine, the switch itself is likely suffering from an internal short causing the high amp draw. Remove and replace the faulty switch.

5. 5

   Clear Codes

   After repairing the wiring or replacing the switch, clear the fault codes from the TECU to verify the repair was successful.