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.
Automatic Transmission System: Initialization
- PERFORM ROAD TEST TO ALLOW TCM TO LEARN CAUTION:
- Perform the following procedures while strictly observing all traffic laws and speed limits.
- Do not accelerate or decelerate rapidly.
- "Road test" procedure is as follows:
- Warm up the engine.
- According to the replacement parts, perform the road test shown below.PARTS SPECIFICATION
Replacement Parts Road Test - Automatic transmission assembly
- TCM
- Valve body assembly
- Shift solenoid valve SL3
- Engine assembly
- ECM
Perform pattern 1 and 2
Pattern 1:*1
With shift lever on D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approx. 30 km/h (19 mph)
Pattern 2:*2
With shift lever on S4, after gradually accelerating to 30 km/h (19 mph) or more, gradually decelerate to approx. 10 km/h (6 mph)- Shift solenoid valve SL1
- Shift solenoid valve SL2
- Shift solenoid valve SL4
- Shift solenoid valve SL5
Pattern 1:*1
With shift lever on D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approx. 30 km/h (19 mph)HINT: - *1: After gradually accelerating a distance of approximately 130 m (426.4 ft.) for a period of approximately 15 seconds, gradually decelerate a distance of approximately 45 m (147.6 ft.) for a period of approximately 5 seconds.
- *2: After gradually accelerating a distance of approximately 40 m (131.2 ft.) for a period of approximately 8 seconds, gradually decelerate a distance of approximately 20 m (65.6 ft.) for a period of approximately 5 seconds.
- When decelerating, apply the brakes as necessary to adjust the vehicle speed.
HINT:
- *1: The speed, time and distance values are approximate values.
- *2: After accelerating, the deceleration does not need to be performed immediately.
- Repeat until the shift shock and engine speed overrun settles down.NOTE: Before repeating tests, stop the vehicle once, and then start moving the vehicle again.
- RESET MEMORY NOTE:
- Perform the Reset Memory (AT initialization) when replacing the engine assembly or ECM.
- The Reset Memory can be performed only with the Techstream.
- Reset Memory cannot be completed by only reconnecting the cable to the negative (-) battery terminal.
HINT:
The TCM memorizes the vehicle conditions when the ECT controls the automatic transmission assembly and engine assembly.
- The "Reset Memory" procedure is as follows:
- Turn the engine switch off.
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Powertrain / ECT / Utility / Reset Memory.NOTE: After performing the Reset Memory, be sure to perform the ROAD TEST described previously.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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