Fault Phenomenon: SANY SKT105 wide body mining truck instrument falsely reports low transmission pressure, but measured pressure is normal, machine sometimes limits speed.

Troubleshooting Process:
– Checked switch: pressure switch internal contacts poor contact or normally closed.
– Checked wiring: wiring shorted to ground.
– Checked actual pressure: mechanical gauge measurement meets standard.
– Checked controller: TCU receiving incorrect signal.

Root Cause: The transmission pressure switch is internally faulty, incorrectly sending a low-pressure signal to the controller, triggering protection logic.

Required Parts: Replace transmission pressure switch.