A/T - Harsh Delayed Shift Into Drive/Reverse
Group: TRANSAXLENumber: 07-40-015
Date: NOVEMBER 2007
Model:
2007 ELANTRA
Subject:
AUTOMATIC TRANSAXLE HARSH AND/OR DELAYED ENGAGEMENT INTO DRIVE OR REVERSE
NOTE:
This procedure uses the GDS to analyze shift performance for the 2007 Elantra with A4CF2 transaxle and is an alternative to the A/T Tester.
DESCRIPTION:
To diagnose a 2007 or later Elantra A4CF2 automatic transaxle with a harsh or delayed shift into Drive or Reverse, follow the Diagnostic Procedure shown below:
DIAGNOSTIC PROCEDURE:
1. Check the ATF level when the engine is idling in "N" according to TSB 06-40-016.
2. Perform adaptive learning by shifting from Neutral-Reverse and Neutral-Drive, stopping in each gear for 5 seconds. Repeat 10 times.
3. Compare to a similar model and year vehicle. If the shift delay is longer than the comparison vehicle, continue the diagnosis.
4. Check that idle speed is within specification. If not, inspect according to the appropriate shop manual, Fuel System Section.
5. Check the engine and transaxle mounting brackets and roll support brackets. If necessary, replace the mounts.
6. Attach the GDS or Hi-Scan Pro and check for Diagnostic Trouble Codes in both the "ENGINE" and "AUTOMATIC TRANSAXLE" menu. If DTCs are found, repair according to the appropriate TSB or shop manual.
7. Attach the GDS or Hi-Scan Pro and select "AUTOMATIC TRANSAXLE" menu, "CURRENT DATA" menu and "FLUID TEMPERATURE SENSOR". Confirm the oil temperature sensor operates correctly as shown. If not, inspect the oil temperature sensor according to TSB 04-40-016 or Elantra Shop Manual.
8. Select "CURRENT DATA" and "THROTTLE POSITION SENSOR". Open and close the throttle and confirm the TPS increases and decreases smoothly between approximately 0-100% duty.
9. Attach the GDS and select VIN and "A/T", "Current Data" and select "Shift Position", "Pressure Control Solenoids A, B and C and "On/off Solenoid" as shown.
10. Start the engine and move the shift lever between Neutral, Drive and Reverse, stopping 3-5 seconds in each gear.
11. Select "Record" shown at the top right of the screen. GDS will record up to 10 minutes data prior to selecting "Record".
12. Select "PC Record", then save file.
MEASURE PARK TO REVERSE (NEUTRAL TO REVERSE) ENGAGEMENT TIME:
13. Select "Flight Record" and "Data Review", select the vehicle you tested and open the file.
14. Select "Items List" (top right of screen), then select "Shift Position", "Pressure Control Solenoid Valve A, B, and C and ON/off Solenoid".
15. Click the "+" button to change to "0.5 sec/Div or smaller"
16. Move the cursor to the start of the shift and "Left click".
17. Move the cursor to the end of the shift and "Right click".
18. Read the Neutral to Reverse (Pressure Control Solenoid B) engagement time on the top right of the screen. If the Neutral to Reverse shift requires more than 2.0 seconds, exchange a PCM from a properly operating vehicle and follow TSB 06-40-005, "Reset and Relearn Adaptive Values".
^ If the condition is improved, replace the PCM.
^ If the condition is not improved, replace the transaxle.
NOTE:
The solenoid elapsed time is important; the shape of the graph is not.
MEASURE PARK TO DRIVE (NEUTRAL TO DRIVE) ENGAGEMENT TIME:
19. Select "Flight Record" and "Data Review", select the vehicle you tested and open the file.
20. Select "Items List" (top right of screen), then select "Shift Position", "Pressure Control Solenoid Valve A, B, and C and On/Off Solenoid".
21. Click the "+" button to change to "0.5 sec./Div or smaller"
22. Move the cursor to the start of the shift and "Left click".
23. Move the cursor to the end of the shift and "Right click".
24. Read the Neutral to Drive (Pressure Control Solenoid C) engagement time on the top right of the screen. If the Neutral to Drive shift requires more than 2.0 seconds, exchange a PCM from a properly operating vehicle and follow TSB 06-40-005, "Reset and Relearn Adaptive Values".
NOTE:
The solenoid elapsed time is important; the shape of the graph is not.
WARRANTY INFORMATION