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 MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTA/T - DRIVEABILITY CONCERNS
1991 Hyundai Sonata V6-3.0L
A/T - Driveability Concerns
1991 Hyundai Sonata V6-3.0LSECTION A/T - Driveability Concerns
Number: 97-40-031
Group: TRANSAXLE
Date: SEPTEMBER, 1997
Subject: TRANSAXLE DRIVEABILITY (REFERENCE TO ACCELERATOR SWITCH, TPS AND IDLE SWITCH ADJUSTMENT PROCEDURE)
Model:
ALL
DESCRIPTION:
Correct adjustment of the accelerator switch, throttle position sensor (TPS) and idle switch is essential for proper driveability. An accelerator sWitch, TPS or idle switch out of adjustment may cause one or more of the following driveability conditions:
^ Park to Reverse or Park to Drive engagement shock
^ Engine speed fluctuation between 1000-1700 rpm during slow cruise at light throttle opening or during deceleration
^ Harsh 4-3 downshift shock when decelerating to a stop
^ Harsh 1-2 and 2-3 upshift
^ Rough idle
It a vehicle has a driveability condition, verify the adjustment of the accelerator switch (if equipped), TPS and idle switch according to the procedures in the appropriate Shop Manual. These components may be checked using the scan tool (select "4-Speed Trans" menu). Adjust these components if necessary.
For your convenience, the reference pages in each Shop Manual are listed in this TSB.
Note:
TPS is not adjustable on the OBD-II vehicles listed below. For these vehicles, check the operation of TPS and idle switch at idle and open throttle using the scan tool (select "4-Speed Trans", "Codes and Data" and "Data" menus).
ACCENT, ELANTRA, TIBURON
SONATA
EXCEL, SCOUPE
Group: TRANSAXLE
Date: SEPTEMBER, 1997
Subject: TRANSAXLE DRIVEABILITY (REFERENCE TO ACCELERATOR SWITCH, TPS AND IDLE SWITCH ADJUSTMENT PROCEDURE)
Model:
ALL
DESCRIPTION:
Correct adjustment of the accelerator switch, throttle position sensor (TPS) and idle switch is essential for proper driveability. An accelerator sWitch, TPS or idle switch out of adjustment may cause one or more of the following driveability conditions:
^ Park to Reverse or Park to Drive engagement shock
^ Engine speed fluctuation between 1000-1700 rpm during slow cruise at light throttle opening or during deceleration
^ Harsh 4-3 downshift shock when decelerating to a stop
^ Harsh 1-2 and 2-3 upshift
^ Rough idle
It a vehicle has a driveability condition, verify the adjustment of the accelerator switch (if equipped), TPS and idle switch according to the procedures in the appropriate Shop Manual. These components may be checked using the scan tool (select "4-Speed Trans" menu). Adjust these components if necessary.
For your convenience, the reference pages in each Shop Manual are listed in this TSB.
Note:
TPS is not adjustable on the OBD-II vehicles listed below. For these vehicles, check the operation of TPS and idle switch at idle and open throttle using the scan tool (select "4-Speed Trans", "Codes and Data" and "Data" menus).
ACCENT, ELANTRA, TIBURON
SONATA
EXCEL, SCOUPE
RENDER: 1.0x
NO RELATED
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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.