Pulse Generator Analysis (00-40-011)
Publication date: 2000-08-01Reference number: 00-40-011
PULSE GENERATOR ANALYSIS
TECHNICAL SERVICE BULLETIN
Reference Number(s): 00-40-011, Date of Issue:
August 2000
| HYUNDAI: | 1995-2001 Accent ; 1992-2001 Elantra ; 1986-1994 Excel ; 2001 Santa Fe ; 1991-1995 Scoupe ; 1997-2001 Tiburon and 2001 XG 30 |
| GROUP: | 40 - Transaxle |
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 1-2 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):
DIAGNOSTIC CODES (DTC)
| OBDII | NON-OBDII | DESCRIPTION |
|---|---|---|
| P0717 | 31 and/or 81 | No pulse generator - A signal |
| P0722 | 32 and/or 82 | No pulse generator - B signal |
NOTE:
Always check the "Engine" and "Automatic Transaxle" menus in the HDS Scan Tool or Hi-Scan Pro for additional codes.
NOTE:
The following DTCs may be induced by an incorrect output of the PG-B and do NOT necessarily indicate a mechanical condition exists in the transaxle.
INCORRECT OUTPUT DTCs
| Part Number | Qty |
|---|---|
| P0732 | A/T 2nd gear incorrect ratio |
| P0733 | A/T 3rd gear incorrect ratio |
| P0734 | A/T 4th gear incorrect ratio |
| P1624 | MIL - On request from TCM |
SERVICE PROCEDURE
- Check for DTCs using the Scan Tool 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
- Disconnect the pulse generator connector (Fig 1 ).
- Use a DVOM to measure the resistance between male pins 1-2 and 3-4 of the pulse generators (Fig 2
). If the resistance is:
- Below 215 ohms or above 275 ohms, replace the pulse generators
- Within 215-275 ohms, go to Step 4
- Using small needle nose pliers, gently twist the male pins in the pulse generator main connector (Fig 3
) 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.
- Reconnect the pulse generator connector.
- Remove the connector from the transaxle mounting bracket. Leave the connector loose on the transaxle case to prevent any tension on the harness.
- Verify the correct operation of the pulse generator according to the procedure shown below:
- Connect the Scan Tool or Hi-Scan Pro to the DLC.
- From the Menu, select "Hyundai Vehicle Diagnosis", "Automatic Transaxle" and "Current Data".
- 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.
- Select "Hyundai Vehicle Diagnosis", "Automatic Transaxle" and "Diagnostic Trouble Code". Confirm the DTCs have not returned.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
WARRANTY INFORMATION
| Op Code | Operation | Op Time | Op Qty | Causal Part | Nature Code | Cause Code |
|---|---|---|---|---|---|---|
| 45644R00 | Pulse generator replacement | See LTS | 1 | See Parts catalog for pulse generator assembly | N26 | C15 |
| 45644R0F | Pulse generator connector repair | 0.2 | 1 | " | " | " |
| 45644RP0 | Scan Tool Operation | 0.3 | 1 | " | " | " |