Lexus LS400 (2000 year). Manual - part 1

AT033–01

–

AUTOMATIC TRANSMISSION

AUTOMATIC TRANSMISSION SYSTEM

AT–1

1508

AUTOMATIC TRANSMISSION SYSTEM

PRECAUTION

If the vehicle is equipped with a mobile communication system, refer to the precautions in the IN sec-
tion.

AT038–01

D01014

Shift Lock Solenoid

Shift Lock Control Switch

Shift Lock Control ECU

Shift Lock Override
Button

Stop Light Switch

Key Interlock Solenoid

–

AUTOMATIC TRANSMISSION

SHIFT LOCK SYSTEM

AT–13

1520

SHIFT LOCK SYSTEM

LOCATION

AT039–01

Z16912

P

SLS

+

P1

P2

SLS

–

ACC

IG

STP

SPD

DOFF

E

B

A

KLS

+

D01015

3 (SLS

+)

6 (SLS

–)

AT–14

–

AUTOMATIC TRANSMISSION

SHIFT LOCK SYSTEM

1521

INSPECTION

1.

INSPECT SHIFT LOCK CONTROL ECU

Using a voltmeter, measure the voltage at each terminal.
HINT:
Do not disconnect the ECU connector.

Terminal

Measuring Condition

Voltage (V)

A, 1 – A, 5 (ACC – E)

IG SW ACC

10 – 14

A, 2 – A, 5 (IG – E)

IG SW ON

10 – 14

A, 8 – A, 5 (STP – E)

Depress brake pedal

10 – 14

(1) IG SW ACC and shift lever P position

Below 1.5

A, 3 – A, 5 (KLS

+

 – E)

(2) IG SW ON and shift lever R, N, D, 3, 2, L position

8.5 – 10.5

A, 3   A, 5 (KLS    E)

(3) IG SW ON and shift lever R, N, D, 3, 2, L position (after 1 second)

7.0 – 8.5

A 4

A 5 (SPD

E)

(1) IG SW ON, shift lever D or 3 position and vehicle speed more than 11 km/h 

(6.8 mph)

Below 2

A, 4 – A, 5 (SPD – E)

(2) IG SW ON, shift lever D or 3 position and vehicle speed less than 11 km/h 

(6.8 mph)

10 – 14

A 7

A 5 (DOFF

E)

(1) IG SW ON and shift lever D, 3 position

10 – 14

A, 7 – A, 5 (DOFF – E)

(2) IG SW ON and shift lever P, R, N, 2, L position

0

(1) IG SW ON and shift lever P position

0

B 3

B 6 (SLS

+

SLS )

(2) IG SW ON and depress brake pedal

8.8 – 12.5

B, 3 – B, 6 (SLS

+

 – SLS–)

(3) IG SW ON and depress brake pedal (after 20 seconds)

6.5 – 9.2

(4) IG SW ON and shift lever D, 3, 2, L position

0

B 5

B 1 (P1

P)

(1) IG SW ON and shift lever P position

0

B, 5 – B, 1 (P1 – P)

(2) IG SW ON and shift lever R, N, D, 3, 2, L position

10 – 14

B 4

B 1 (P2

P)

(1) IG SW ACC and shift lever P position

10 – 14

B, 4 – B, 1 (P2 – P)

(2) IG SW ACC and shift lever R, N, D, 3, 2, L position

0

2.

INSPECT SHIFT LOCK SOLENOID

(a)

Disconnect the solenoid connector.

(b)

Using an ohmmeter, measure the resistance between ter-
minals 3 and 6.
Standard resistance: 20 – 28 

Ω

If the resistance is not as specified, replace the solenoid.

D01016

3 (SLS

+)

6 (SLS

–)

Z16909

+

–

Z16910

+

–

D01017

1 (P)

5 (P1) 4 (P2)

–

AUTOMATIC TRANSMISSION

SHIFT LOCK SYSTEM

AT–15

1522

(c)

Apply the battery voltage between terminals 3 and 6. At
this time, confirm that the solenoid operates.

If the operation is not as specified, replace the solenoid.

3.

INSPECT KEY INTERLOCK SOLENOID

(a)

Disconnect the solenoid connector.

(b)

Using an ohmmeter, measure the resistance between ter-
minals 3 and 4.
Standard resistance: 12 – 17 

Ω

If the resistance value is not as specified, replace the solenoid.

(c)

Touch the solenoid with your finger and check that the so-
lenoid operation can be felt when battery voltage is ap-
plied intermittently to terminals 3 and 4.

If the operation is not as specified, replace the solenoid.

4.

INSPECT SHIFT LOCK CONTROL SWITCH

Inspect that there is continuity between each terminal.

Shift position

Tester condition

Specified value

P position (Shift lever at

left side)

5 – 1 (P1 – P)

Continuity

P position (Shift lever at

right side)

5 – 1 (P1 – P)

4 – 1 (P2 – P)

Continuity

R, N, D, 3, 2, L position

4 – 1 (P2 – P)

Continuity

If the continuity is not as specified, replace the switch.