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TCM is activated by power supply. Signals from several sensors, such as ATFS and APS, is inputted to TCM. Comparing inputted siganals with control LOGIC saved at micro controller and EEPROM, TCM controlls Transmission as actuating solenoids . To guarantee accurate control, TCM performs SELF TEST, DIAGNOSIS of several sensors and actuators. And if serious trouble which affects vehicle performance occurrs, TCM sets DTCs. At certain cases, TCM inhibites shifting in order to prevent dangerous situation due to incorrect control.

By comparing the checksum value with a stored value in flash ROM, a malfunction can be detected after IG ON.

caution

The function with the higher priority will aiways take precedence. However, a low-priority is not overruled by a higher priority function.

Functions from different priority categories can also run in parallel. It is important to note which function will take precedence in this case.

In such an event it is possible for a substitute function with low priority not be carried out if a second, higher-priority function is present. This has been taken into account when compiling the priority list and is international.

The mechanical emergency run function must always have the highest priority, since from the electrical standpoint it is the only safe condition.

Does the scantool show same DTC again ?

	▶ Substitute with a known-good Mechatronics (Valve-body + TCM) and check for proper operation. If the problem is corrected,replace Mechatronics (Valve-body + TCM) and then go to "Verification of Vehicle Repair" procedure.
	▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

How to perform Initial Learning

If you replace the automatic transmission or Mechatronics (Valve-body + TCM), or if you overwrite the TCU software, be sure to initialize the learned values and perform initial learning.

Step 1) Warm-up

Raise the ATF temperature by leaving the vehicle idling or performing city drive. Check the ATF temperature using the Scan-tool and make sure it is between 50°C( 122 °F) and 120°C( 248 °F). If the ATF temperature is outside this range, work to bring the range.

caution

Don't raise the oil temperature by stalling the engine.

(Reference)

If the oil temperature is not between 50°C( 122 °F) and 120°C ( 248 °F), initial learning can not be performed. Before learning, check for variable speed shock or shift shock.

STEP 2) Driving learning

Select "D" range then depress accelerator pedal smoothly, and keep the APS value 17%, shift gear to 5th gear.

RKeep the vehicle speed over 60kM/h.

In condition that release the accelerator pedal and then depress the brake pedal narmally.Stop the vehicle then keep 5seconds.

STEP 3) Repeat this procedure 10 times.(Not necessary N-D,N-R Learning)

Item	Detecting Condition	Possible Cause
DTC Strategy	● Watchdog / EEPROM	● Mechatronics(Valve-body + TCM)
Enable Conditions	● "IG KEY" ON
Threshold Value	● Different from correct CHECKSUM value in flash ROM
Diagnostic Time	● Immediately
Fail Safe	● High speed : fixed at 5th gear, low speed : fixed at 3rd gear ● Reverse : Shift lock(Push "Unlock button → possible to shift) (priority :4)

	▶ Go to the applicable troubleshooting procedure.
	▶ System performing to specification at this time.