A/T - Harsh Delayed DRIVE or REVERSE Engagement

Group:
TRANSAXLE

Number:
04-40-011

Date:
AUGUST, 2004

Model:
2003-05 ELANTRA SULEV

Subject:
AUTOMATIC TRANSAXLE HARSH AND/OR DELAYED ENGAGEMENT INTO DRIVE OR REVERSE

DESCRIPTION:

NOTE:
This TSB is applicable for Elantra SULEV vehicles only. Refer to TSB 02-40-008 or TSB 02-40-010 for other vehicles.

If you are servicing a 2003 or later Elantra SULEV transaxle for harsh or delayed engagement into Drive or Reverse, compare the customer's vehicle with another vehicle of the same year and model. If the engagement shock or delay is more noticeable than other vehicles, follow the repair procedure shown below:

DIAGNOSTIC PROCEDURE:

1. Check the ATF level when the engine is idling in "N" according to TSB 03-40-019. Add SPIII ATF if necessary.

2. Check that idle speed is within specification. If not, inspect the Idle Speed Actuator according to the appropriate shop manual, Fuel System Section.

3. Check the engine and transaxle mounting brackets and roll support brackets for broken or deteriorated mounts. If necessary, replace the mounts.

4. Attach the Hi-Scan Pro and check for Diagnostic Trouble Codes in both the "ENGINE" and "AUTOMATIC TRANSAXLE" menu. If DTC are found, repair according to the appropriate TSB or shop manual.





5. Attach the Hi-Scan Pro and select "HYUNDAI VEHICLE DIAGNOSIS" menu, "AUTOMATIC TRANSAXLE" menu, "CURRENT DATA" menu and "FLUID TEMPERATURE SENSOR". Confirm the oil temperature sensor operates correctly as shown. If not, replace the oil temperature sensor.

6. Attach the Hi-Scan Pro and select the following menus:

^ "HYUNDAI VEHICLE DIAGNOSIS"

^ "AUTOMATIC TRANSAXLE"

^ "FLIGHT RECORD", then select:

^ LR and UD solenoid, then F1 "FIX"

^ F6 "RCD" and ENTER

^ Wait 2-3 seconds, move the shift selector to "R" or "D", wait 2-3 seconds and then select F6 "END"

^ Select F1 "GRPH"

HARSH OR DELAYED NEUTRAL-REVERSE ENGAGEMENT:





Confirm the PCM adjusts the duty during the N-R shift similar to graph (LR duty must change from 100% to 0-30% to 100% within 1-2 seconds).

^ If so, continue to next step.

^ If not, check the wiring between the PCM and transaxle for an open or short circuit. If the wiring is ok, replace the PCM (unified ECU & TCU).

Toggle the left and right keys to measure the start and end of the shift, then subtract the two numbers. If the N-R shift requires:

^ 2.0 seconds or less: Go to Step 7.

^ More than 2.0 seconds: Swap a PCM (unified ECM and TCM) from a known good vehicle. If the condition is not improved, replace the transaxle.

HARSH OR DELAYED NEUTRAL-DRIVE ENGAGEMENT:

Perform Step 6.

Confirm the PCM adjusts the duty during the N-D shift similar to graphs (UD duty changes from 0% to 100% within 1-2 seconds).





NOTE:
The duty must change from 0% to 100% within 1-2 seconds. Both graphs show correct solenoid operation.

^ If so, continue to next step.

^ If not, check the wiring between the PCM and transaxle for an open or short circuit. If the wiring is ok, replace the PCM (unified ECU and TCU).

Toggle the left and right keys to measure the start and end of the shift, then subtract the two numbers. If the N-D shift requires:

^ 2.0 seconds or less: Go to Step 7.

^ More than 2.0 seconds: Swap a PCM (unified ECM and TCM) from a vehicle with good shift quality. If the condition is not improved, replace the transaxle.

7. If Steps 1-6 indicate all components are within specification and no DTCs are found, compare the customer's vehicle with another vehicle of the same year and model. If the engagement shock or delay is:

^ Similar to other vehicles: Advise the customer the N-R or N-D engagement is normal for that model/year.

^ More noticeable than other vehicles: Replace the transaxle.





WARRANTY INFORMATION