Lexus ES300 (1997 year). Manual — part 349

D00048

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–173

325

1997 LEXUS ES300 (RM511U)

3

Check shift solenoid valve No.1 or No.2.

PREPARATION:
(a)

Jack up the vehicle.

(b)

Remove the oil pan.

(c)

Disconnect the solenoid connector.

(d)

Remove the shift solenoid valve No.1 or No.2.

CHECK:
(a)

Measure resistance between solenoid connector and
body ground.

(b)

Connect the positive

lead to terminal of solenoid con-

nector, negative

lead to solenoid body.

OK:

(a) Resistance: 11

∼

15

Ω

(b) The solenoid makes an operating noise.

NG

Replace the solenoid valve.

OK

Repair or replace the solenoid wire.

Q04874

Controlled
Pressure

Line
Pressure

Drain

Controlled
Pressure

Q08040

DI–174

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

326

1997 LEXUS ES300 (RM511U)

DTC

P0770

Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)

SYSTEM DESCRIPTION

The ECM uses the signals from the Throttle position sensor,
Air–flow meter and crankshaft position sensor to monitor the
engagement condition of the lock–up clutch.
Then the ECM compares the engagement condition of the
lock–up clutch with the lock–up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body and torque converter clutch.

DTC No.

DTC Detecting Condition

Trouble Area

P0770

Lock–up does not occur when driving in the lock–up range

(normal driving at 80 km/h

[

50 mph

]

), or lock–up remains ON

in the lock–up OFF range.

(2 trip detection logic)

Shift solenoid valve SL is stuck open or closed

Valve body blocked up or stuck

Lock–up clutch

INSPECTION PROCEDURE

1

Check solenoid valve SL operation.

PREPARATION:
(a)

Remove the oil pan.

(b)

Remove the shift solenoid valve SL.

CHECK:
(a)

Applying 490 kPa (5 kgf/cm

2

, 71 psi) of compressed air,

check that the solenoid valve does not leak air.

(b)

When battery positive voltage is supplied to the shift sole-
noid valve, check that the solenoid valve opens.

NG

Replace the solenoid valve SL.

OK

DI0CU–01

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–175

327

1997 LEXUS ES300 (RM511U)

2

Check valve body (See page

DI–164

).

NG

Repair or replace the valve body.

OK

Replace the torque converter clutch
(See page

AX–18

).

Q04972

Transaxle

Shift Solenoid
Valve SL

2

E3

P–L

27

E10

B+

SL

ECM

DI–176

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

328

1997 LEXUS ES300 (RM511U)

DTC

P0773

Shift Solenoid E Electrical Malfunction
(Shift Solenoid Valve SL)

CIRCUIT DESCRIPTION

The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure
acting on the lock–up relay valve, which then controls operation of the lock–up clutch.
Fail safe function
If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.

DTC No.

DTC Detecting Condition

Trouble Area

P0773

Either (a) or (b) are detected for 1 time.

(2 trip detection logic)

(a) Solenoid resistance is 8

Ω

or less short circuit when sole

noid is energized.

(b) Solenoid resistance is 100

k

Ω

or more open circuit when

solenoid is not energized.

Open or short in shift solenoid valve SL circuit

Shift solenoid valve SL

ECM

WIRING DIAGRAM

DI0CV–01