Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI1995ACCENT L4-1.5L SOHC ALPHA ENGINEREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSTCM - ADAPTIVE CONTROL
1995 Hyundai Accent L4-1.5L SOHC Alpha Engine
TCM - Adaptive Control
1995 Hyundai Accent L4-1.5L SOHC Alpha EngineSECTION TCM - Adaptive Control
Group: TRANSAXLE
Number: 97-40-030
Date: SEPTEMBER 1997
Model: ALL
Subject
TRANSAXLE CONTROL MODULE ADAPTIVE CONTROL
DESCRIPTION:
Adaptive control is a software feature built into Hyundai transaxle control modules (TCM) to compensate for:
1. Component parameter drift over time, and
2. Mechanical tolerance changes which may occur during the life of a transaxle due to normal wear
Adaptive control was applied to all TCMs beginning with the 1991 model year. With adaptive control, the TCM compensates for transaxle clutch clearances that are at the high or low end of the specification. The TCM measures the time required to complete the shift from N-R and N-D and compares to a target time of approximately 0.5 - 0.6 seconds. If the shift time is more or less than the target time, the TCM adjusts the pressure control solenoid valve (PCSV) duty cycle during the shift to meet the target time. In a similar manner, the TCM adjusts PCSV duty cycle for the upshifts and downshifts between 1-2, 2-3 and 3-4 gears.
SERVICE PROCEDURE:
Whenever a TCM is installed in a vehicle, the TCM must begin adaptive "learning".
^ If a TCM is disconnected from battery power, the TCM must restore adaptive "learning" after reconnection to battery power. (DO NOT return the vehicle to the customer until adaptive "learning" is completed.)
^ If a transaxle was replaced, the TCM must "relearn" adaptive control parameters to accommodate the new transaxle. Do not conclude that the transaxle has an internal concern until adaptive "learning" is completed.
The TCM will complete adaptive "learning" during normal driving. Depending on the production variations within the transaxle, up to ten upshifts and downshifts between 1-2, 2-3 and 3-4 at varying throttle inputs may be required. Up to ten gear engagements from Neutral to Reverse and Neutral to Drive may also be required.
Number: 97-40-030
Date: SEPTEMBER 1997
Model: ALL
Subject
TRANSAXLE CONTROL MODULE ADAPTIVE CONTROL
DESCRIPTION:
Adaptive control is a software feature built into Hyundai transaxle control modules (TCM) to compensate for:
1. Component parameter drift over time, and
2. Mechanical tolerance changes which may occur during the life of a transaxle due to normal wear
Adaptive control was applied to all TCMs beginning with the 1991 model year. With adaptive control, the TCM compensates for transaxle clutch clearances that are at the high or low end of the specification. The TCM measures the time required to complete the shift from N-R and N-D and compares to a target time of approximately 0.5 - 0.6 seconds. If the shift time is more or less than the target time, the TCM adjusts the pressure control solenoid valve (PCSV) duty cycle during the shift to meet the target time. In a similar manner, the TCM adjusts PCSV duty cycle for the upshifts and downshifts between 1-2, 2-3 and 3-4 gears.
SERVICE PROCEDURE:
Whenever a TCM is installed in a vehicle, the TCM must begin adaptive "learning".
^ If a TCM is disconnected from battery power, the TCM must restore adaptive "learning" after reconnection to battery power. (DO NOT return the vehicle to the customer until adaptive "learning" is completed.)
^ If a transaxle was replaced, the TCM must "relearn" adaptive control parameters to accommodate the new transaxle. Do not conclude that the transaxle has an internal concern until adaptive "learning" is completed.
The TCM will complete adaptive "learning" during normal driving. Depending on the production variations within the transaxle, up to ten upshifts and downshifts between 1-2, 2-3 and 3-4 at varying throttle inputs may be required. Up to ten gear engagements from Neutral to Reverse and Neutral to Drive may also be required.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.