Inspection of TCM and Its Circuits

Inspection of TCM and Its Circuits

TCM and its circuits can be checked at TCM wiring connectors by measuring voltage and pulse signal.

NOTE:

If you connect a voltmeter or ohmmeter directly to the TCM terminals by removing the TCM connectors, you can damage the TCM.

Never connect a voltmeter or an ohmmeter directly to any terminal on the TCM by disconnecting the TCM connectors.

Voltage and Signal Check

1) Remove TCM (1) from vehicle. Service and Repair.
2) Connect TCM connectors (2) to TCM.
3) Check voltage and/or pulse signal at each terminal of connectors using voltmeter (3) and oscilloscope (4).

NOTE:
- As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition mode of keyless push start system is in "ON".
- Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope.
- *1: Reference voltage
- For "Ignition mode" described in the following table, it means power supply mode in keyless push start system.
For more details of ignition mode, refer to Description of Keyless Engine Start Function Description of Keyless Engine Start Function.










Connector "E19"







Connector "E20"











Reference Waveform

Oscilloscope display

Shown below is typical waveform display provided by oscilloscope.

NOTE:

- Display includes the following types of data:











- Waveforms may vary with measurement conditions and vehicle specifications.

CAN communication signal

CAN communication signal (High) (1):





CAN communication signal (Low) (2):





Measurement condition

- Engine: Stop
- Ignition mode: ON






TCC solenoid valve signal

TCC solenoid valve signal (1):





Measurement condition

- Vehicle: Running
- CVT: Lock-up on after warming up





- Vehicle: Running
- CVT: Lock-up off after warming up






Secondary pressure control solenoid valve signal

Secondary pressure control solenoid valve signal (1):





Measurement condition

- Engine: Running after warming up
- Select lever position: "D" range
- Accelerator pedal: Depressed fully





- Engine: Idle speed
- Select lever position: "D" range
- Accelerator pedal: Released






Line pressure control solenoid valve signal

Line pressure control valve signal (1):





Measurement condition

- Engine: Running after warming up
- Select lever position: "D" range
- Accelerator pedal: Depressed fully





- Engine: Idle speed
- Select lever position: "D" range
- Accelerator pedal: Released






Stepper motor signal

Stepper motor No.1 signal (1):





Stepper motor No.2 signal (2):





Stepper motor No.3 signal (1):





Stepper motor No.4 signal (2):





Measurement condition

- Engine switch: For 10 sec. from ignition mode to "ON"






Secondary pulley speed sensor signal

Secondary pulley speed sensor signal (1):





Measurement condition

- Vehicle: Drive vehicle at 20 km/h (12 mile/h)
- CVT: After warming up






Primary pulley speed sensor signal

Primary pulley speed sensor signal (1):





Measurement condition

- Vehicle: Drive vehicle at 20 km/h (12 mile/h)
- CVT: After warming up