Upgraded E-Locker axle

Vlady · Aug 19, 2025

Toycoma2021 said: ↑

I did my measurement at the diff coil input and it was PWM, the output from the ECU would be the same with some waveform degradation at the diff. Voltage is input to the coil to energize it. It is not an output at the coil.

Your attached chart shows the output at F12 (the 4x4 ECU). Curious that they show no measurement test between pins 1&5 of F12; that is where the real power is put to the diff coil. You didn’t include the “Waveform 1&2” detail, they probably show reverse polarity. The test seems to be testing each side of the FET output from the ECU. Making sure both FETs are conducting. If one FET was not conducting properly it might seem like the locker was working but not reliably.
Click to expand...

here are forms
1 for Ign continuity, 2 for GRD continuity

Vlady · Aug 20, 2025

Just to add to PWM argument. PWN has Input and Output directions. The rear locker and front diff engagement operate on the same principals. PMW does not lock/engage.
PWM in both cases is a status to 4WD Ecu on the state of the locker/ADD (off- In Process-Locked-Failed to lock)
For both systems, PMW is output signal to ECU. In manual, it states that coil signal is used to pass the info to Stability and Brake booster control units.
Theoretically, you can send 5 V to the locker coil and engage the locker, but you won't know if it is locked/unlocked or still trying to lock. For that you need a "decoder" for PMW

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Upgraded E-Locker axle

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