Automatic Transaxle System > Automatic Transaxle System > Troubleshooting

General Description

The value of the input shaft speed should be equal to the value of the output shaft speed, when multiplied by the 5th gear ratio, while the transaxle is engaged in the 5th gear. For example, if the output speed is 1000 rpm and the 5th gear ratio is 0.859, then the input speed is 859 rpm.

DTC Description

This code is set if the value of input shaft speed is not equal to the value of the output shaft, when multiplied by the 5th gear ratio, while the transaxle is engaged in 5th gear. This malfunction is mainly caused by mechanical troubles such as control valve sticking or solenoid valve malfunctioning rather than an electrical issue.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	5th gear incorrect ratio

•

C2 clutch

•

C3 clutch

•	Valve-body(C2, C3 pressure system)

•

TCU

•	Line pressure solenoid valve(SLT)

•	Shift control solenoid valve(SLC1, SLC2, SLB1)

•	S1,S2 solenoid valve

Enable Conditions

•	ATF temp. > 20°C

•	Output speed > 500rpm

•	TCU communication = normal

•

TPS >10%

•	Shift lever switch = "D" range

•	Shift gear = 5th gear

Threshold value

•	ㅣInput speed/5th gear ratio - output speed ㅣ≥200rpm

Diagnostic Time

•	More than 12 times × more than1sec

Fail Safe

•	Self learning control is inhibited

•	Locked in 3rd gear

•	Adaptive control is inhibited

Monitor Scantool Data

※ It is difficult to "STALL TEST" in 5th gear, therefore Go to "Signal circuit inspection" procedure.

Signal Circuit Inspection

1.	Connect Scantool.

2.	Engine "ON".

3.	Monitor the "INPUT & OUTPUT SPEED SENSOR" parameter on the scantool.

Accelerate the Engine speed until about 2000 rpm in the 5th gear.

Specification : INPUT SPEED - (OUTPUT SPEED × GEAR RATIO) ≤ 200 RPM

Does "INPUT & OUTPUT SPEED SENSOR" within specifications?

	▶ Go to "Component Inspection" procedure.
	▶ Check for electrical noise of circuit in INPUT & OUTPUT SPEED SENSOR or Replace INPUT & OUTPUT SPEED SENSOR. Repair as necessary and Go to "Verification of Vehicle Repair" procedure.

Component Inspection

1.	Connect Oil pressure gauge to "C1" port.

2.	Engine "ON".

3.	Drive a car with gear position 5 in "SPORTS MODE".

Compare it with reference data as below.

Specification : refer to Standard Oil Pressure Table as below

STANDARD PERSSURE
SHIFT LEVER POSITION	ENGINE STATUS	ELEMENT	Specification (Kg/cm²)
"D" RANGE	IDLE	C1 CLUTCH	3.8 ~ 4.4
"R" RANGE	IDLE	C3 CLUTCH	5.9 ~ 7.1

Is oil pressure value within specifications?

	▶ Repair AUTO TRANSAXLE(Clutch or Brake) as necessary and Go to "Verification of Vehicle Repair" procedure.
	▶ Replace AUTO TRANSAXLE (BODY CONTROL VALVE faulty) 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.