A/T - Intermittent Delayed, Erratic, Harsh Shifting
Group: TRANSAXLENumber: 98-40-002
Date: APRIL, 1998
Model: ALL
Subject
PULSE GENERATOR DIAGNOSIS
This TSB revises TSB # 97-40-025-1 to provide additional diagnosis procedures
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
^ Bucking and/or hesitation
The following diagnostic codes (DTC) may be stored in memory in the transaxle control module (TCM):
OBD II NON-OBD II DESCRIPTION
P0717 31 and/or 81 No pulse generator-A signal
P0722 32 and/or 82 No pulse generator-B signal
Note 1:
For Non-OBD II vehicles, always check the "Transaxle" menu in the HDS Scan Tool for additional codes.
Note 2:
The following DTCs may be induced by an incorrect output of the PG-B and do not necessarily indicate a mechanical condition in the transaxle.
P0732 A/T 2nd gear ratio problem
P0733 A/T 3rd gear ratio problem
P0734 A/T 4th gear ratio problem
P1624 MIL- On request from TCM
After repairs are made to the pulse generator, clear the codes and test drive the vehicle for two driving cycles*. If the DTCs do not return, the codes were induced by the incorrect output of the PG-B.
* A driving cycle is defined as:
^ The engine is started cold (coolant at ambient temperature)
^ The coolant temperature rises to 160°F
^ The fuel system goes into closed loop. (To determine closed loop, attach the HDS Scan Tool to the data link connector (DLC), select "Engine", "Codes and Data" and "Data" menus and monitor "Fuel Sys1" until the readout is "CL")
SERVICE PROCEDURE:
1. Disconnect the pulse generator connector.
2. 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.
3. Reconnect the pulse generator connector.
4. Remove the connector from the transaxle mounting bracket. Leave the connector loose on the transaxle case to prevent any tension on the harness.
5. Verify the correct operation of the pulse generator according to the procedure shown.
A. Connect the HDS Scan Tool to the DLC.
B. From the Menu, select "4-Speed Trans", "Codes and Data" and "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.
WARRANTY INFORMATION: