SERVICE MANUAL
  Applies to: Hyundai Coupe/Tiburon 1998-2000
GROUP
Transaxle/Transmission Automatic Transaxle System
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OIL PRESSURE TESTS 
  1. Completely warm up the transaxle.

  1. Raise the front of the vehicle so that the front wheels can be rotated.

  1. Connect an engine tachometer and place it in a position where it's easy to see.

  1. Attach the special oil-pressure gauge (09452-21500) and the adapter (09452-21002) to each oil-pressure outlet port. When the reverse pressure is to be tested, the 3,000 kPa (400 psi) type of gauge should be used.

  1. Measure the oil pressure under various conditions. Check to be sure that the measured results are within the standard value range shown in the "Standard oil pressure table" below.

    If the oil pressure is not within the specified range, check and repair as described in the section "Preliminary Steps If Oil Pressure Is Not Normal" on the next page.

    Standard Oil Pressure Table
    NOTE
    - must be 19.6 kpa (2.8 psi) or less.
    SW-ON: Switch ON the overdrive control switch.
    SW-OFF: Switch OFF the overdrive control switch.
    * : Hydraulic pressure is generated, but not the standard value.
Preliminary Steps If Oil Pressure is Not Normal
Trouble symptom
Probable cause
Remedy
*Line pressures are all low (or high).
NOTE
*"Line pressures" refers to oil pressures 2,3,4,5,6,7and 8 in the "Standard oil pressure table" on the previous page.
Clogging on oil filter
Visually inspect the oil filter; replace the oil filter if it is restricted.
Improper adjustment of oil pressure (line pressure) regulator valve
Measure line pressure 2 (kickdown brake pressure); if the pressure is not the standard value, readjust the line pressure, or if necessary, replace the valve body assembly.
Sticking of regulator valve
Check the operation of the regulator valve; repair if necessary, or replace the valve body assembly.
Looseness of valve body tightening part
Tighten the valve body tightening bolt and installation bolt.
lmproper oil pump discharge pressure
Check the side clearance of the oil pump gear; replace the oil pump assembly if necessary.
Improper reducing pressure
Improper line pressure
Check the 2 kickdown brake pressure (line pressure); if the line pressure is not the standard value, check as described in item 1 above.
Clogging of the filter (L shaped type) of the reducing pressure circuit
Disassemble the valve body assembly and check the filter; replace the filter if it is restricted.
Improper adjustment of the reducing pressure
Measure the 1 reducing pressure; if it is not the standard value, readjust, or replace the valve body assembly.
Sticking of the reducing valve
Check the operation of the reducing valve; if necessary, repair it, or replace the valve body assembly.
Looseness of valve body tightening part
Tighten the valve body tightening bolt and installation bolt.
Improper kickdown servo pressure
Malfunction of the D-ring or seal ring of the sleeve or kickdown servo piston.
Disassemble the kickdown servo and check whether the seal ring or D-ring is damaged.
If it is cut or has scratches, replace the seal ring or D-ring.
Looseness of valve body tightening part
Tighten the valve body tightening bolt and installation bolt.
Functional malfunction of the valve body assembly.
Replace the valve body assembly.
Trouble symptom
Probable cause
Remedy
Improper front clutch pressure
Malfunction of the D-ring or seal ring of the sleeve or kickdown servo piston.
Disassemble the kickdown servo and check whether the seal ring or D-ring is damaged.
Looseness of valve body tightening part.
If it is cut or has scratches, replace the seal ring or D-ring.
Malfunction of the valve body assembly.
Tighten the valve body tightening bolt and installation bolt.
Wear of the front dutch piston or retainer, or malfunction of the D-ring. (Refer to the figure on the next page.)
Replace the valve body assembly.
Oil pump gasket or seal ring (2) damaged.
Disassemble the transaxle itself and check whether or not there is wear of the front clutch piston and retainer inner circumference, or damage of the D-ring. If there is any wear or damage, replace the piston, retainer, D-ring and/ or seal ring.
Improper end clutch pressure

Malfunction of a D-ring, seal ring of the end clutch or O-ring of the pipe (Refer to the following figure.)
Disassemble the end clutch and check the seal ring, D-ring of the piston, seal ring of the retainer, etc.; replace if there are cuts, soars, scratches or damage.
Looseness of valve body tightening part.
Tighten the valve body tightening bolt and installation bolt.
Malfunction of the valve body assembly
Replace the valve body assembly.
Improper low-reverse brake pressure
O-ring between valve body and transaxle damaged or missing
Remove the valve body assembly and check to be sure that the O-ring at the upper surface of the upper valve body is not missing or damaged; install or replace the O-ring if necessary.
Looseness of valve body tightening part
Tighten the valve body tightening bolt and installation bolt.
Malfunction of the valve body assembly
Replace the valve body assembly.
Malfunction of the O-ring of the low-reverse brake piston or the O-ring of the retainer (Refer to the following figure.)
Disassemble the transaxle itself and check the O-ring for damage; replace if there are cuts, scars, scratches or damage.
Improper damper clutch release pressure
Sticking of the damper clutch control solenoid valve (DCCSV) or the damper clutch control valve.
Check the operation of the damper clutch system and the DCCSV.
Clogging or leaking of the oil cooler and/or lines.
Repair or replace, as necessary, the cooler and/or lines.
Damaged seal ring of the input shaft (Refer to the following the figure)
Disassemble the transaxle itself and check for damage of the seal ring; replace the seal ring if there is damage.
Malfunction of the torque converter
Replace the torque converter.
Improper rear clutch pressure
Malfunction of the D-ring or seal ring of the rear clutch.
Disassemble the end clutch and check the seal ring, D-ring of the piston, seal ring of the retainer, etc.; replace if there are cut, scars, scratches or damage.
Looseness of valve body tightening part.
Tighten the valve body tightening bolt and installation bolt.
Functional malfunction of the valve body assembly.
Replace the valve body assembly.
Improper damper clutch apply pressure
Same as the probable cause of damper clutch release pressure
Same as the remedy of damper clutch release pressure
NEUTRAL
PARKING
DRIVE (FIRST)
DRIVE (SECOND)
DRIVE (THIRD)
DRIVE (FOURTH)
LOCK UP
REVERSE