Lexus ES300 (2002 year). Manual — part 329
C82158
C91565
DSL
E1
C90646
(+)
(-)
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
05-435
588
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a)
Connect the transmission wire connector.
(b)
Disconnect the ECM connector.
(c)
Measure the resistance between terminals DSL and E1.
OK:
Resistance: 11 - 13
Ω
at 20
C (68
F)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page
)
OK
CHECK AND REPLACE ECM(See page
)
4
INSPECT SHIFT SOLENOID VALVE DSL
(a)
Remove the shift solenoid valve DSL.
(b)
Measure the resistance between the terminal DSL of shift
solenoid valve and the solenoid body.
OK:
Resistance: 11 - 13
Ω
at 20
C (68
F)
(c)
Connect positive (+) lead to the terminal of solenoid con-
nector, negative (-) lead to the solenoid body.
OK:
The solenoid valve makes an operationing noise.
NG
REPLACE SHIFT SOLENOID VALVE DSL
OK
REPAIR OR REPLACE TRANSMISSION WIRE(See page
05-436
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
589
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1520
STOP LIGHT SWITCH 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 depressed, this switch sends a signals to the ECM. Then the ECM cancels the op-
eration of the lock-up clutch while braking is in progress.
DTC No.
DTC Detection 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 lamp switch assy
ECM
WIRING DIAGRAM
See page
.
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 ”STOP LIGHT SW” 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
STOP LIGHT SW
Stop light SW Status/
ON or OFF
Brake Pedal is depressed: ON
Brake Pedal is released: OFF
←
OK
REPAIR OR REPLACE ECM(See page
NG
2
INSPECT STOP LAMP SWITCH ASSY
(See page
NG
REPLACE STOP LAMP SWITCH ASSY
OK
0527S-04
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
05-437
590
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH ASSY - ECM)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page
)
OK
REPAIR OR REPLACE ECM(See page
C93634
ECM
NT+
NT-
27
35
L
LG
2
1
E9
E9
T4
Turbine Speed Sensor
05-438
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
591
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1725
NT REVOLUTION SENSOR CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the input turbine. By comparing the input turbine speed signal (NT)
with the counter gear speed sensor signal (NC), the ECM detects the shift timing of the gears and appropri-
ately controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear
shifting is performed.
DTC No.
DTC Detection Condition
Trouble Area
P1725
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 park/neutral position switch are normal
(c) NT < 300 rpm
Open or short in turbine speed sensor circuit
Speed sensor (NT)
ECM
WIRING DIAGRAM
0527T-04
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