Accent GT Coupe L4-1495cc 1.5L DOHC MFI (1997)
Transmission Speed Sensor: All Technical Service Bulletins
A/T - Driveability Concerns/DTC's Set/MIL ON
Group: TRANSAXLE
Number: 97-40-025-1
Date: August, 1997
Model: ALL
Subject:
PULSE GENERATOR DIAGNOSIS
This TSB revises TSB # 97-40-025 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.
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Delayed or erratic 1-2 shift, with engine hot or cold
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Harsh 1-2 shift
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Harsh 2-1 downshift, at a higher speed than the normally scheduled downshift
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Erratic downshift during light acceleration
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Third-gear "fail-safe" condition and/or "Check Engine" light on
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Bucking and/or hesitation
The following 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:
*Fail-safe code
Note 2:
Always check the "Transaxle" menu in the HDS scanner for additional codes. DTC P0732 (non-synchronous 2nd Gear), P0733 (nonsynchronous 3rd
Gear), P0734 (non-synchronous 4th Gear) and P1624 (transaxle system concern) may also be found in memory in the TCM. These DTCs may be
induced by the incorrect output of the PG-B and do not necessarily indicate a mechanical condition in the transaxle. 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.
DIAGNOSTIC PROCEDURE:
As part of the diagnostic procedure, inspect and test the pulse generator according to the procedure shown below:
1.
Turn the ignition switch to "ON" and connect the HDS Scanner to the Data Link Connector (DLC).
2.
From the Menu, select "Transaxle", "Codes and Data", and "Codes". If DTC for pulse generators shown on the previous page are stored in
memory, replace the pulse generators and go to the "Main Connector Repair" section of this TSB. If no codes are stored, continue to step 3.
3.
From the Menu, select "Data". While driving the vehicle at approximately 30 mph in third gear, with the overdrive switch off, have an assistant
monitor PG-A and PG-B. Check that both PG-A and PG-B are approximately equal to the engine rpm in third gear.
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If so, continue to "Main Connector Repair".
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If not or if the PG-A or PG-B outputs fluctuate rapidly when the improper shift condition occurs, the pulse generators are not functioning
properly or the wiring harness is damaged. Continue to "Main Connector Repair".