Lexus ES300 (1997 year). Manual — part 350

Q07648

SL

Q07938

SL

SL

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–177

329

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Measure resistance between terminal SL of ECM and body ground.

PREPARATION:
Disconnect the connector from ECM.
CHECK:
Measure resistance between terminal SL of ECM and body
ground.
OK:

Resistance: 8

∼

100,000

Ω

OK

Check and replace the ECM.

NG

2

Check harness and connector between ECM and automatic transaxle solenoid
connector (See page

IN–27

).

PREPARATION:
Disconnect the solenoid connector from the transaxle.
CHECK:
Check the harness and connector between terminal SL of ECM
and terminal SL of solenoid connector.
OK:

There is no open or short circuit.

NG

Repair or replace the harness or connector.

OK

D00049

DI–178

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

330

1997 LEXUS ES300 (RM511U)

3

Check shift solenoid valve SL.

PREPARATION:
(a)

Jack up the vehicle.

(b)

Remove the oil pan.

(c)

Disconnect the shift solenoid valve SL connector.

(d)

Remove the shift solenoid valve SL.

CHECK:
(a)

Measure resistance between terminal SL of shift solenoid
valve and solenoid body.

(b)

Connect positive

lead to terminal of solenoid connec-

tor, negative

lead to solenoid body.

OK:

(a) Resistance: 11

∼

15

Ω

(b) The shift solenoid valve SL makes operation
noise.

NG

Replace the shift solenoid valve SL.

OK

Check and replace or repair the solenoid
wire.

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–179

331

1997 LEXUS ES300 (RM511U)

DTC

P1520

Stop Light Switch Signal Malfunction

CIRCUIT DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling, while driving in lock–up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signals to ECM. Then the ECM cancels operation
of the lock–up clutch while braking is in progress.

DTC No.

DTC Detecting Condition

Trouble Area

P1520

No stop light switch signal to ECM during driving.

(2 trip detection logic)

Open or short in stop light switch circuit

Stop light switch

ECM

WIRING DIAGRAM

See page

DI–123

.

INSPECTION PROCEDURE

See page

DI–123

.

DI0CW–04

Q04869

NC2 Revolution Sensor

Q04973

Direct Clutch
Speed Sensor

2

V3

1 V3

G

R

E9

9

E9

4

ECM

NC2

+

NC2–

4

∼

6 V

DI–180

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

332

1997 LEXUS ES300 (RM511U)

DTC

P1705

NC2 Revolution Sensor Circuit Malfunction
(Direct Clutch Speed Sensor)

CIRCUIT DESCRIPTION

This sensor detects the rotation speed of the direct clutch drum.
By comparing the direct clutch speed signal and the vehicle
speed sensor signal, the ECM detects the shift timing of the
gears and appropriately controls the engine torque and hydrau-
lic pressure in response to various conditions, thus performing
smooth gear shifting.

DTC No.

DTC Detecting Condition

Trouble Area

P1705

The ECM detects conditions (a), (b), (c), (d), (e) and f) continu-

ity for 4 secs or more.

(2 trip detection logic)

(a) Vehicle speed : 32 km/h (20 mph) or more

(b) 3rd or 4th gear

(c) NC2 < 300 rpm

(d) Park/neutral position switch: OFF

(e) Solenoid valves and vehicle speed sensor are normal

(f) L position: OFF

Open or short in direct clutch speed sensor circuit

Direct clutch speed sensor

ECM

WIRING DIAGRAM

DI0CX–01