4.
Shift gear at each position.
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FIG 1) P,N
FIG 2) "R"
FIG 3) "D 1st" grar
FIG 4) "2nd" gear
FIG 5) "3rd" gear
FIG 6) "4th" gear
FIG 7) "5th" gear
The Automatic transmission changes the gear position of the transmission by utilizing a combination of clutches and brakes, which are controlled by solenoid valves. The HIVEC Automatic Transmission consists of a: LR (Low and Reverse Brake), 2ND (2nd Brake), UD (Under Drive Clutch), OD (Over Drive Clutch), REV (Reverse Clutch), and a RED (Reduction Brake, only for 5 speed transmissions).
The UD Clutch is engaged in the 1st gear, 2nd gear and 3rd gear positions.
The TCM checks the Under Drive Clutch Control Signal by monitoring the feedback signal from the solenoid valve drive circuit. If an unexpected signal is monitored (for example, high voltage is detected when low voltage is expected, or low voltage is detected when high voltage is expected), the TCM judges that Under Drive control solenoid circuit is malfunctioning and sets this code.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Check voltage range | ● Open or short in circuit ● Faulty UD SOLENOID VALVE ● Faulty PCM/TCM |
Enable Conditions | ● 16V ＞ Voltage Battery ＞11V ● In gear state(no gear shifting) 500msec is passed from turn on the relay ● A/T Relay = ON ● Engine state = RUN | |
Threshold value | ● Out of available voltage range | |
Diagnostic Time | ● More than 5 seconds | |
Fail Safe | ● Locked in 3rd gear.(Control relay off) |
Solenoid Valve for Pressure Control
Sensor type : Normal open 3-way
Operating temperature : -22~266°F(-30°C∼130°C)
Frequency :
- LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20°C above) - DCC : 30.64Hz - VFS : 600 ± 20Hz ※ KM series : 35Hz |
Internal resistance :
- 2.7~3.4Ω(68°F or 20°C) - LR, 2ND, UD, OD, RED, DCC - 4.35±0.35Ω(68°F or 20°C) - VFS |
Surge voltage : 56 V
Connect scantool to data link connector(DLC)
Engine "ON".
Monitor the "UD SOL. VALVE" parameter on the scantool.
Shift gear at each position.
FIG 1) P,N
FIG 2) "R"
FIG 3) "D 1st" grar
FIG 4) "2nd" gear
FIG 5) "3rd" gear
FIG 6) "4th" gear
FIG 7) "5th" gear
Does "UD SOLENOID DUTY " follow the reference data?
▶ Fault is intermittent caused by poor contact in the sensor's and/or TCM(PCM)'s connector or was repaired and TCM(PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of vehicle repair" procedure.
▶ Go to "Terminal＆connector inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and then go to "Verification of vehicle repair" procedure.
▶ Go to "Power supply circuit inspection" procedure.
Disconnect "A/T SOLENOID VALVE" connector.
Measure voltage between terminal "5" of the sensor harness connector and chassis ground.
Turn ignition switch OFF → ON.
Specification: 12V is measured only for approx. 0.5sec
Is voltage within specifications?
▶ Go to "Signal circuit inspection" procedure.
▶ Check that A/T-20A fuse in engine room junction is installed or not blown.
▶ Check for open in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.
Check signal circuit open inspection
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
Measure resistance between terminal "3" of the ATM SOLENOID VALVE harness connector and terminal "3" of the PCM/TCM harness connector.
Specification: approx. 0 Ω
Is resistance within specifications?
▶ Go to "Check signal circuit short inspection" procedure.
▶ Check for open in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.
Check signal circuit short inspection
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
Measure resistance between terminal "3" of the ATM SOLENOID VALVE harness and chassis ground.
Specification: Infinite
Is resistance within specifications?
▶ Go to "Component inspection" procedure.
▶ Check for short to ground in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.
CHECK SOLENOID VALVE
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector.
Measure resistance between terminal "3" and terminal "5" of the ATM SOLENOID VALVE harness connector.
Specification: Approximately 2.7~3.4 Ω [20°C(68°F)]
Is resistance within specification?
▶ Go to "CHECK PCM/TCM" as below.
▶ Replace UD SOLENOID VALVE as necessary and go to "Verification of vehicle repair" procedure.
CHECK PCM/TCM
Connect scantool to data link connector(DLC).
Ignition "ON" ＆ Engine "OFF".
Select A/T Solenoid valve Actuator test and Operate Actuator test.
Can you hear operating sound for UD SOLENOID VALVE actuator testing function?
▶ Go to "Verification of vehicle repair" procedure.
▶ Replace PCM/TCM as necessary and go to "Verification of vehicle repair" procedure.
ACTUATOR TEST CONDITION
IG SWITCH ON
TRANSAXLE RANGE SWITCH is normal
P RANGE
Vehicle Speed 0mph(0km/h)
Throttle position sensor ＜ 1V
IDLE SWITCH ON
ENGINE RPM 0
After a repair, it is essential to verify that the fault has been corrected.
Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.
Using a scantool, Clear DTC.
Operate the vehicle within DTC Enable conditions in General information.
Are any DTCs present ?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
