Lexus ES300 (1997 year). Service 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
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
INSPECTION PROCEDURE
See page
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
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