Automatic Transaxle System > Automatic Transaxle System > Troubleshooting

Component Location

General Description

The TCU is control each solenoid-valve in order to maintain optimum gear shift.

DTC Description

The TCU set this code, when the abnormal code is happened.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	Check the shift signal

•	S1,S2 solenoid-valve

•

TCU

•	Line pressure solenoid-valve(SLT)

•	Shift solenoid-valve(SLC1,SLC2, SLC3,SLB1)

Enable Conditions

•	ATF temp.>65°C

•	TCU communication = normal

•	Shift lever switch = "D" range

•	Output speed > 300rpm

Threshold Value

•	Detect abnormal shifting

Diagnostic Time

•	more than 20 times × more than1 sec

Fail Safe

•	Self learning control is inhibited.

•	Adaptive control is inhibited

Schematic Diagram

Monitor Scantool Data

1.	Connect scantool to data link connector(DLC).

2.	Engine "ON".

3.	Monitor the all solenoid-valve parameters on the scan tool.

4.	Shift gear at each position.

Does all "SOLENOID DUTY" follow the reference data?

	▶ Fault is intermittent caused by poor contact in the sensor's and/or TCM(PCM)'s connector or was repaired and TCM(PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Component inspection 1" procedure.

Component Inspection 1

1.	IG KEY OFF.

2.	Remove the TCU.

3.	Measure the resistance between "S1" solenoid-valve terminal and groung terminal of "S1" solenoid-valve.

Measure the resistance between "S2" solenoid-valve terminal and groung terminal of "S2" solenoid-valve.

Specification : Approx. 11~15Ω ( 20°C)

Is resistance within specifications?

	▶ Go to "Component inspection 2" procedure.
	▶ Replace solenoid-valve as necessary and Go to "Verification of Vehicle Repair" procedure.

Component Inspection 2

1.	IG KEY OFF.

2.	Remove the TCU.

Measure the resistance of "SLC1" "SLC2" "SLC3" "SLB1" solenoid-valves.

Specification : Approx. 5.0 ~ 5.6Ω ( 20°C)

Is resistance within specifications?

	▶ Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Replace solenoid-valve as necessary and Go to "Verification of Vehicle Repair" procedure.

NOTE)

When replacing the TCU, must perform the N position learning and the Initial learning. (refer to Troubleshooting's 'How to perform N position learning' and 'How to perform initial learning')

Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

2.	Using a scantool, Clear DTC.

3.	Operate the vehicle within DTC Enable conditions in General information.

Are you DTCs present?

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