The shift solenoid valve SLT controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the current of the SLT solenoid valve to control the hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 AB60F AUTOMATIC TRANSMISSION / TRANSAXLE

Warm up the engine.

This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid.

Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are stored with 1 trip detection logic.

DTCs which are stored in the ECM can be output to the intelligent tester.

The tester can display pending DTCs and current DTCs. Some DTCs are not stored unless a malfunction is detected in consecutive driving cycles. When a malfunction is detected in only one driving cycle, it is stored as a pending DTC.

When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (complying with SAE J1987). Various data output from the vehicle ECM can then be read.

Using an oscilloscope, check waveform 1.

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 AB60F AUTOMATIC TRANSMISSION / TRANSAXLE