Diagnostic Procedure

1. Inspect the ATF level in "NEUTRAL" with the ATF at normal operating temperature (70-90°C, 158-194°F).

A. If the oil level is low, add ATF to bring the level to the top of the "Full" mark.

B. Inspect the ATF color and smell. If the ATF is black and smells burned, remove the transaxle oil pan. If metal particles and clutch material are found in the oil pan, replace the transaxle.

2. Check that idle speed is within specification. Adjust, if applicable. (Refer to appropriate Shop Manual, Fuel System section, "Service Adjustment Procedures").

3. Attach the scan tool to the data link connector (DLC) and select the "Transaxle" menu.

A. Select "Codes" and check for diagnostic codes (DTC). If DTCs are found, repair the condition.

B. Select "Data" and "Trans Temp." Check that the transaxle ATF temperature reads as shown below. If not, replace the oil temperature sensor.

^ ATF cold - scan tool reads the same temperature as outside air

^ ATF at normal operating temperature- scan tool reads 70-90°C (158-194°F)

C. Select "Data" and "Idle Switch". Check that the idle switch reads as shown below. If not, adjust or replace the idle switch. (For adjustment procedures, see TSB # 96-30-004 for 1995-97 Sonata 3.0L or TSB # 97-30-001 for 1995-97 Sonata 2.0L).

^ Engine idling - Idle switch reads "On" or "Closed"

^ Engine rpm increased 100-200 rpm above idle - Idle switch reads "Off" or "Open"

4. Check that the transaxle control module (TCM) commands the pressure control solenoid valve (PCSV) correctly when Drive or Reverse is selected by either of the following methods. If not, replace the TCM.

A. Connect the scan tool to the DLC and select "Transaxle" menu, then select "Data". Check that PCSV duty reads 50-95% momentarily when Drive or Reverse is engaged.

B. Install the J39853 automatic transaxle tester. Observe the PCSV indicator light when Drive or Reverse is engaged. The light should illuminate briefly during gear engagement.

5. Check the range switch for an internal short circuit using the procedure described in TSB # 97-40-002. If a short circuit in the range switch is found, replace the switch.

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

7. If Steps 1 - 6 indicate that 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 customer's vehicle engagement shock is:

^ Similar to other vehicles - advise the customer that the engagement is normal for that model/year.

^ More noticeable than other vehicles - replace the TCM for vehicles produced PRIOR to the effective date shown in the PARTS INFORMATION table. For all other vehicles, replace the transaxle.