Lexus ES300 (2002 year). Manual - part 330

C58536

C82158

C91565

NT+

NT-

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-439

592

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

INSPECT SPEED SENSOR(NT)

(a)

Disconnect the speed sensor connector ftom the trans-
axle.

(b)

Measure the resistance between terminals of speed sen-
sor.
OK:
Resistance:
TOYOTA made: 500 - 620 

Ω

 at 20 



C (68 



F)

AISIN made: 560 - 680 

Ω

 at 20 



C (68 



F)

NG

REPLACE SPEED SENSOR(NT)

OK

2

CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)

(a)

Connect the speed sensor connector.

(b)

Disconnect the ECM connector.

(c)

Measure the resistance between terminals NT+ and NT-.
OK:
Resistance:
TOYOTA made: 500 - 620 

Ω

 at 20 



C (68 



F)

AISIN made: 560 - 680 

Ω

 at 20 



C (68 



F)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 

01-31

)

OK

CHECK AND REPLACE ECM(See page 

01-31

)

C93635

ECM

NC+

NC-

E9

34

26

R

G

2

1

C1 
Counter Gear Speed Sensor

E9

05-440

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

593

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

P1730

NC REVOLUTION SENSOR CIRCUIT
MALFUNCTION

CIRCUIT DESCRIPTION

This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC)
with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriate-
ly controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shift-
ing is performed.

DTC No.

DTC Detection Condition

Trouble Area

P1730

ECM detects conditions (a), (b), (c) and (d) continuity for 5 sec.
or more: (1 trip detection logic)

(a) Vehicle speed: 50 km/h (20 mph) or more

(b) Solenoid valves and neutral start switch are normal

(c) NC < 300 rpm

Open or short in counter gear speed sensor circuit

Speed sensor (NC)

ECM

WIRING DIAGRAM

0527U-04

C58536

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-441

594

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER

(a)

Warm up the engine.

(b)

Turn the ignition switch OFF.

(c)

Connect the OBD II scan tool or Hand-held tester to the DLC3.

(d)

Turn the ignition switch ON and push the OBD II scan tool or Hand-held tester main SW ON.

(e)

Select the item ”SPD (NC)” in the DATALIST and read its value displayed on the OBD II scan tool or
Hand-held tester.

NOTICE:
The values given below for ”Normal Condition” are representative values, so a vehicle may still be
normal even if its value differs from those listed here. Do not depend solely on the ”Normal Condi-
tion” here when deciding whether or not the part is faulty.

Item

Measurement Item/

Display (Range)

Normal Condition

Diagnostic Note

SPD (NC)

Counter Gear Speed

display: 50 r/min

D Position is warmed up, 3rd;
Same as input shaft speed

←

OK

CHECK AND REPLACE ECM(See page 

01-31

)

NG

2

INSPECT SPEED SENSOR(NC)

(a)

Disconnect the speed sensor connector ftom the trans-
axle.

(b)

Measure the resistance between terminals of speed sen-
sor.
OK:
Resistance:
TOYOTA made: 500 - 620 

Ω

 at 20 



C (68 



F)

AISIN made: 560 - 680 

Ω

 at 20 



C (68 



F)

NG

REPLACE SPEED SENSOR(NC)

OK

C82158

C91565

NC+

NC-

05-442

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

595

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)

(a)

Connect the speed sensor connector.

(b)

Disconnect the ECM connector.

(c)

Measure the resistance between terminals NC+ and
NC-.
OK:
Resistance:
TOYOTA made: 500 - 620 

Ω

 at 20 



C (68 



F)

AISIN made: 560 - 680 

Ω

 at 20 



C (68 



F)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 

01-31

)

OK

CHECK AND REPLACE ECM(See page 

01-31

)