Hyundai Tiburon (2003 year). Manual — part 104

brake system

• Noise generated

P0733

3rd gear ratio does not meet the specification
If the output from the output shaft speed sensor multiplied by the 3rd
gear ratio is not the same as the output from the input shaft speed
sensor after the shift to 3rd gear has been completed, diagnosis code
P0733 is set. If diagnosis code P0733 is set four times, the transmission
is locked into 3rd gear as a fail-safe measure.

• Malfunction of the input shaft

speed sensor

• Malfunction of the output shaft

speed sensor

• Malfunction of the underdrive

clutch retainer

• Malfunction of the transfer drive

gear or driven gear

• Malfunction of the underdrive

clutch system

• Malfunction of the overdrive

clutch system

• Noise generated

P0734

4th gear ratio does not meet the specification
If the output from the output shaft speed sensor multiplied by the 4th
gear ratio is not the same as the output from the input shaft speed
sensor after the shift to 4th gear has been completed, diagnosis code
P0734 is set. If diagnosis code P0734 is set four times, the transmission
is locked into 3rd gear as a fail-safe measure.

• Malfunction of the input shaft

speed sensor

• Malfunction of the output shaft

speed sensor

• Malfunction of the underdrive

clutch retainer

• Malfunction of the transfer drive

gear or driven gear

• Malfunction of the second

brake system

• Malfunction of the overdrive

clutch system

• Noise generated

P0736

Reverse gear ratio does not meet the specification
If the output from the output shaft speed sensor multiplied by the
reverse gear ratio is not the same as the output from the input shaft
speed sensor after the shift to reverse gear has been completed,
diagnosis code P0736 is set. If diagnosis code P0736 is set four times,
the transmission is locked into 3rd gear as a fail-safe measure.

• Malfunction of the input shaft

speed sensor

• Malfunction of the output shaft

speed sensor

• Malfunction of the underdrive

clutch retainer

• Malfunction of the transfer drive

gear or driven gear

• Malfunction of the low and

reverse brake system

• Malfunction of the reverse

clutch system

• Noise generated

P1749

Serial communication
If normal communication is not possible for a continuous period of 1
second or more when the ignition switch is at the ON position, the
battery voltage is 10V or more and the engine speed is 450r/min or
more, diagnosis code No.P1749 is set. Diagnosis code No.P1749 is
also set if the data being received is abnormal for a continuous period of
4 seconds under the same conditions.

• Malfunction of connector

• Malfunction of the ECM

• Malfunction of the TCM

P1723

A/T control relay system
If the A/T control relay voltage is less than 7V
after the ignition switch has been turned ON, it
is judged that there is an open circuit or a short-
circuit in the A/T control relay ground and
diagnosis code P1723 is set. Then the
transmission is locked into 3rd gar as a fail-safe
measure.

Short circuit to ground/
Open circuit

• Malfunction of the A/T control

relay

• Malfunction of connector

• Malfunction of the TCM

P0707

Transaxle range switch
No signal is continuous for > 30 seconds

• Malfunction of transaxle range

switch

P0708

Above 2 signals are continuous for > 30 seconds

P1630

CAN-BUS OFF

• No 3 speed hold fail

• No PG-A, B fail

• Battery voltage > 10V continuously for 0.5 second

• No engine stop

• Receive BUS OFF information from CAN CONTROLLER

• TCM Fail

• TCM side open & short

P1631

CAN-TIME OUT ECM

• No 3 speed hold fail

• No PG-A, B fail

• Battery voltage > 10V continuously for 0.5 second

• No engine stop

• No output signal for 1.5 second

• ECM fail

• ECM side open & short

P1764

TCM CAN MI-COM

• No 3 speed hold fail

• No PG-A, B fail

• Battery voltage > 10V continuously for 0.5 second

• No engine stop

• Communication error output is continuously for > 1 second

• CAN MI-COM CIRCUIT

INSPECTION CHART FOR THROUBLE SYMPTOMS

Trouble symptom

Probable cause

Communication with HI-SCAN is not possible
is not functioning.

• Malfunction of diagnosis line

• Malfunction of connector

• Malfunction of the TCM

Driving impossible

Starting impossible
Starting is not possible when the selector lever
is in P or N range. In such cases, the cause is
probably a defective engine system, torque
converter or oil pump.

• Malfunction of the engine system

• Malfunction of the torque converter

• Malfunction of the oil pump

Does not move forward
If the vehicle does not move forward when the
selector lever is shifted from N to D range while
the engine is idling, the cause is probably
abnormal line pressure or a malfunction of the
underdrive clutch or valve body.

• Abnormal line pressure

• Malfunction of the underdrive solenoid valve

• Malfunction of the underdrive clutch

• Malfunction of the valve body

Does not reverse
If the vehicle does not reverse when the
selector lever is shifted from N to R range while
the engine is idling, the cause is probably
abnormal pressure in the reverse clutch or low
and reverse brake or a malfunction of the
reverse clutch, low and reverse brake or valve
body.

• Abnormal reverse clutch pressure

• Abnormal low and reverse brake pressure

• Malfunction of the low and reverse brake

solenoid valve

• Malfunction of the reverse clutch

• Malfunction of the low and reverse brake

• Malfunction of the valve body

Does not move (forward or reverse)
If the vehicle does not move forward or reverse
when the selector lever is shifted to any
position while the engine is idling, the cause is
probably abnormal line pressure or a
malfunction of the power train, oil pump or
valve body.

• Abnormal line pressure

• Malfunction of power train

• Malfunction of the oil pump

• Malfunction of the valve body

Malfunction when

Engine stalling when shifting

• Malfunction of the engine system

starting

If the engine stalls when the selector lever is
shifted from N to D or R range while the engine
is idling, the cause is probably a malfunction of
the engine system, damper clutch solenoid
valve, valve body or torque converter (damper
clutch malfunction).

• Malfunction of the damper clutch control

solenoid valve

• Malfunction of the valve body

• Malfunction of the torque converter

• (Malfunction of the damper clutch)

Shocks when changing from N to D and
large time lag
If abnormal shocks or a time lag of 2 seconds
or more occur when the selector lever is shifted
from N to D range while the engine is idling, the
cause is probably abnormal underdrive clutch
pressure or a malfunction of the underdrive
clutch, valve body.

• Abnormal underdrive clutch pressure

• Abnormal low and reverse brake pressure

• Malfunction of the underdrive solenoid valve

• Malfunction of the valve body

• Malfunction of the idle position switch

Shocks when changing from N to R and
large time lag
If abnormal shocks or a time lag of 2 seconds
or more occur when the selector lever is shifted
from N to R range while the engine is idling, the
cause is probably abnormal reverse clutch
pressure or low and reverse brake pressure, or
a malfunction of the reverse clutch, low and
reverse brake, valve body or idle position
switch.

• Abnormal reverse clutch pressure

• Abnormal low and reverse brake pressure

• Malfunction of the low and reverse solenoid

valve

• Malfunction of the reverse clutch

• Malfunction of the low and reverse brake

• Malfunction of the valve body

• Malfunction of the idle position switch

Shocks when changing from N to D, N to R
and large time lag
If abnormal shocks or a time lag of 2 seconds
or more occur when the selector lever is shifted
from N to D range and from N to R range while
the engine is idling, the cause is probably
abnormal line pressure or a malfunction of the
oil pump or valve body.

• Abnormal line pressure

• Malfunction of the oil pump

• Malfunction of the valve body

Malfunction when
shifting

Shocks and running up
If shocks occur when driving due to upshifting
or downshifting and the transmission speed
becomes higher than the engine speed, the
cause is probably abnormal line pressure or a
malfunction of a solenoid valve, oil pump, valve
body, brake or clutch.

• Abnormal line pressure

• Malfunction of each solenoid valve

• Malfunction of the oil pump

• Malfunction of the valve body

• Malfunction of each brake or each clutch

Displaced shifting
points

All points
If all shift points are displaced while driving, the
cause is probably a malfunction of the output
shaft speed sensor, TPS or solenoid valve.

• Malfunction of the output shaft speed

sensor

• Malfunction of the throttle position sensor

• Malfunction of each solenoid valve

• Abnormal line pressure

• Malfunction of the valve body

• Malfunction of the TCM

Some points
If some of the shift points are displaced while
driving, the cause is probably a malfunction of
the valve body, or it is related to control and is
not an abnormality.

• Malfunction of the valve body

Does not shift

No diagnosis codes
If shifting does not occur while driving and no
diagnosis codes are set, the cause is probably
a malfunction of the transaxle range switch, or
TCM

• Malfunction of the transaxle range

• Malfunction of the TCM

Malfunction while

Poor a acceleration

• Malfunction of the engine system

driving

If acceleration is poor even if downshifting
occurs while driving, the cause is probably a
malfunction of the engine system, brake or
clutch.

• Malfunction of the brake of clutch

Malfunction while
driving

Vibration
If vibration occurs when driving at constant
speed or when accelerating and deceleration in
top range, the cause is probably abnormal
damper clutch pressure or a malfunction of the
engine system, damper clutch control solenoid
valve, torque converter or valve body.

• Abnormal damper clutch pressure

• Malfunction of the engine system

• Malfunction of the damper clutch control

solenoid valve

• Malfunction of the torque converter

• Malfunction of the valve body

Transaxle range switch system
The cause is probably a malfunction of the inhibitor switch circuit,
ignition switch circuit or a defective TCM.

• Malfunction of the transaxle range switch

• Malfunction of the ignition switch

• Malfunction of connector

• Malfunction of the TCM

Idle position switch system
The cause is probably a defective idle position switch circuit, or a
defective TCM.

• Malfunction of the idle position switch

• Malfunction of connector

• Malfunction of the TCM

Triple pressure switch system
The cause is probably a defective triple pressure switch circuit or a
defective TCM.

• Malfunction of the triple pressure switch

• Malfunction of connector

• Malfunction of A/C system

• Malfunction of the TCM

Vehicle speed sensor system
The cause is probably a defective vehicle speed sensor circuit or a
defective TCM.

• Malfunction of the vehicle speed sensor

• Malfunction of connector

• Malfunction of the TCM

ELEMENTS IN USE IN EACH GEAR

Operating element

Underdrive
clutch (UD)

Reverse

clutch (REV)

Overdrive

clutch (OD)

Low-and

reverse

brake (LR)

Second

brake (2nd)

One way

clutch

(OWC)

Selector lever position

P

Parking

-

-

-

O

-

-

R

Reverse

-

O

-

O

-

-

N

Neutral

-

-

-

O

-

-

D

1st

O

-

-

O

-

O

2nd

O

-

-

-

O

-

3rd

O

-

O

-

-

-

4th

-

-

O

-

O

-

3

1st

O

-

-

O

-

O

2nd

O

-

-

-

O

-

3rd

O

-

O

-

-

-

2

1st

O

-

-

O

-

O

2nd

O

-

-

-

O

-

L

1st

O

-

-

O

-

O

OPERATING ELEMENTS AND THEIR FUNCTION

Operating element

Code

Function

Underdrive clutch

UD

Connects input shaft and underdrive sun gear

Reverse clutch

REV

Connects input shaft and reverse sun gear

Overdrive clutch

OD

Connects input shaft and overdrive planetary carrier