An improperly functioning pulse generator on a 1996-2000 Elantra, 1997-2001 Tiburon or 1996-2004 Accent may result in the following conditions (Note: These conditions may be intermittent and difficult to duplicate.)
• Diagnostic Trouble Codes:
– P0717 – No pulse generator-A signal;
– P0722 – No pulse generator-B signal;
– P1624 – MIL-on request from TCM;
• Third-gear “Fail-Safe” condition and/or Check Engine light on;
• Harsh, delayed or erratic 1-2 upshift;
• Harsh or erratic 2-1 downshift during light acceleration; or
• Vehicle “bucking” and/or hesitation.
Repair Procedure:
1. Follow the procedure below according to the vehicle and production dates shown in the chart at right.
2. Check for DTC in both the “Engine” and “Automatic Transaxle” menus. If you have the DTC in the chart below, perform the repair procedure. 
3. Clean both ends of the pulse generator connectors and the connectors to the TCM with aerosol electrical contact cleaner. See Fig. 1.
4. Reconnect the pulse generator connector. For 1996-2000 Elantra vehicles only, remove the connector from the transaxle bracket. Leave the connector loose on the transaxle case to prevent any tension on the harness. See Fig. 2.
5. Test-drive the vehicle for at least two key-on, key-off driving cycles (including 1-2-3-4 upshifts and 4-3-2-1 downshifts):
– If P0722 recurs, go to Step 6.
– If P0717 recurs, go to Step 7.
6. For 1996-2000 Elantras or 1996-2000 Accents, replace the reed switch on the speedometer. For 1997-2001 Tiburons, replace the vehicle speed sensor on the transaxle. Test-drive the vehicle for at least two key-on, key-off driving cycles (including 1-2-3-4 upshifts and 4-3-2-1 downshifts):
– If P0717 or P0722 recur, go to Step 7.
7. Replace the TCM. Test-drive the vehicle for at least two key-on, key-off driving cycles (including 1-2-3-4 upshifts and 4-3-2-1 downshifts):
– If P0717 or P0722 recur, go to Step 8.
8. Replace the wiring harness between the TCM and pulse generators.
Courtesy of Identifix.
