A/T - Harsh Shifts, DTCs P0717/P0722 Set

Group:
TRANSAXLE

Number:
00-40-011

Date:
AUGUST, 2000

Model:
ALL EXCEPT SONATA

Subject:
PULSE GENERATOR ANALYSIS

DESCRIPTION:
The following conditions may be caused by an improperly functioning pulse generator. The conditions may be intermittent and difficult to duplicate.

^ Delayed or erratic 1-2 shift, with engine hot or cold

^ Harsh 1-2 shift

^ Harsh 2-1 downshift, at a higher speed than the normally scheduled downshift

^ Erratic downshift during light acceleration

^ Third-gear "Fail-Safe" condition and/or "Check Engine" light on

^ Vehicle "Bucking" and/or Hesitation





The following diagnostic codes (DTC) may be stored in memory in the transaxle control module TCM):

Note 1:
Always check the "Engine" and "Automatic Transaxle" menus in the HDS ScanTool or Hi-Scan Pro for additional codes.





Note 2:
The illustrated DTCs may be induced by an incorrect output of the PG-B and do NOT necessarily indicate a mechanical condition exists in the transaxle

SERVICE PROCEDURE:

1. Check for DTCs using the Scantool or HI-Scan Pro. If you find:

^ DTCs P0717 or P0722: Replace the pulse generators. Go to Step 4.

^ No DTCs: Go to Step 2





2. Disconnect the pulse generator connector.





3. Use a DVOM to measure the resistance between male pins 1-2 and 3-4 of the pulse generators. If the resistance is:

^ Below 215 ohms or above 275 ohms, replace the pulse generators

^ Within 215-275 ohms, go to Step 4





4. Using small needle nose pliers, gently twist the male pins in the pulse generator main connector approximately ten (10) degrees clockwise to ensure electrical contact.

Clean both ends of the pulse generator connector with aerosol electrical contact cleaner such as NAPA Electronic Cleaner, P/N 765-1843 or MOPAR MP-50 Electrical Contact Cleaner, P/N 04549626 or equivalent.

5. Reconnect the pulse generator connector.

6. Remove the connector from the transaxle mounting bracket. Leave the connector loose on the transaxle case to prevent any tension on the harness.

7. Verify the correct operation of the pulse generator according to the procedure shown below:

A. Connect the Scan Tool or Hi-Scan Pro to the DLC.

B. From the Menu, select "Vehicle Diagnosis", "Automatic Transaxle" and "Current Data".

C. Drive the vehicle at a steady speed in third gear with the overdrive switch off while an assistant monitors PG-A and PG-B. Check that both PG-A and PG-B are approximately equal to the engine rpm in third gear. If so, the pulse generators are functioning properly.

D. Select "Hyundai Vehicle Diagnosis", "Automatic Transaxle" and "Diagnostic Trouble Code". Confirm the DTCs have not returned.





WARRANTY INFORMATION: