MPU electric motor has poor power connection, or an internal component fault
1. Check power supply connection for corrosion: - Switch battery OFF - Remove MPU pole cover - Thoroughly inspect the plus pole cable ring terminal, the associated M6 nut, and the cable wire where it is crimped to the ring terminal, for corrosion. >> If corroded, the ring terminal, nut and wire/cable, must be replaced as a set. >> If the terminal screw on the MPU::eMotor is badly corroded, the eMotor must be replaced as well. 2. Check power supply to MPU electric motor: - Remove MPU pole cover - Switch battery ON (connections / master switch) and measure voltage on MPU power terminals (M6 screws). It should be approximately 24 volt (battery voltage). - Switch battery OFF - Check tightening torque for both M6 terminal nuts, and ground cable connection to frame. - Check the MPU fuse - Visually inspect the isolation along the entire cable length, for abrasion damage that could lead to a short circuit against frame or similar. 3. Replace electric motor (M53) in the MPU.
What you'll see
No driver-visible symptom recorded.
System reaction
Red Steer tag axle fault warn ESTA in released or fixed mode
Diagnostic depth
The Electric motor (M53) in the MPU has detected an internal component failure. This could however also be caused by a poor power supply connection (which is more likely).
Poor power supply connection might be caused by: • Corrosion on plus connection • Power terminal nuts are loose • Faulty cable harness Internal component failure is set for: • MPU Phase overcurrent • MPU Speed sensor error • MPU Battery overcurrent • MPU Gate driver fault • MPU demagnetization of position magnet • MPU unplausible temperature