Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2010 Mazda 3 L4-2.5LFACTORY OEM SERVICE PROCEDURE
Oscilloscope Patterns and Waveforms
TCM INSPECTION [FS5A-EL]
Input/Output Wave From (Reference)
Shift solenoid A
- TCM terminals
AG (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 4GR
Shift solenoid B
- TCM terminals
AJ (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 1GR
Shift solenoid C
- TCM terminals
AL (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
D range 1GR
Pressure control solenoid B
- TCM terminals
AM (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
- Test Condition
Shifting from 4GR to 5GR or from 5GR to 4GR
Pressure control solenoid A (+)
- TCM terminals
AD (+)-body GND (-)
- Oscilloscope setting
5 V/DIV (Y), 1 ms/DIV (X), DC range
- Test Condition
The following conditions are met:
- Ignition switch ON (engine off)
- P position
- Accelerator pedal fully depressed
Pressure control solenoid A (-)
- TCM terminals
AE (+)-body GND (-)
- Oscilloscope setting
200 mV/DIV (Y), 1 ms/DIV (X), DC range
- Test Condition
The following conditions are met:
- Ignition switch ON (engine off)
- P position
- Accelerator pedal fully depressed
Input/turbine speed sensor
- TCM terminals
AB (+)-Y (-)
- Oscilloscope setting
1 V/DIV (Y), 2 ms/DIV (X), DC range
- Test Condition
Idle at P position after warm-up
Intermediate sensor
- TCM terminals
AC (+)-body GND (-)
- Oscilloscope setting
1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Test Condition
Vehicle speed at 30 km/h {19 mph}.
VSS
- TCM terminals
Z (+)-body GND (-)
- Oscilloscope setting
1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Test Condition
Vehicle speed at 30 km/h {19 mph}.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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