2001 TOYOTA HIGHLANDER clutch

05-940- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1130 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0724 BRAKE SWITCH ºBº CIRCUIT HIGH
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 Detecting ConditionTrouble Area
P0724
The stop light switch remains ON even when the vehicle is
driven in a GO (30 km/h) and STOP (3 km/h) fashion 5 times.
(2-trip detection logic).
Short in stop light switch signal circuit

Stop light switch

ECM
MONITOR DESCRIPTION
This DTC indicates that the stop light switch remains on. When the stop light switch remains ON during ºstop
and goº driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM
stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) 5 times
for two driving cycles in order to detect malfunction.
MONITOR STRATEGY
Related DTCsP0724: Stop light switch/Range check/Rationality
Required sensors/ComponentsStop light switch, Vehicle speed sensor
Frequency of operationContinuous
DurationGO and STOP 5 times
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage8 V or more
Ignition switchON
StarterOFF
GO (Vehicle speed is 30 km/h (18.63 mph) or more)Once
STOP (Vehicle speed is less than 3 km/h (1.86 mph))Once
TYPICAL MALFUNCTION THRESHOLDS
Brake switchRemain ON during GO and STOP 5 times
05F3C-05

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-949
1139 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0746 PRESSURE CONTROL SOLENOID ºAº
PERFORMANCE (SHIFT SOLENOID VALVE
SL1)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0746The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SL1 remains open or closed

Valve body is blocked

Shift solenoid valve SL1

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the
actual gear position are not same, the ECM illuminates the MIL.
Example:
When either condition (a) or (b) is met, the ECM detects a malfunction.
(a) The ECM commands the 1st gear, but the actual gear is 2nd.
(b) The ECM commands the 2nd gear, but the actual gear is 1st.
MONITOR STRATEGY
Related DTCs
P0746:
Shift solenoid valve SL1/OFF malfunction
Shift solenoid valve SL1/ON malfunction
Required sensors/ComponentsShift solenoid valve SL1, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration
OFF malfunction, ON malfunction (A)
0.8 sec.
ON malfunction (B)
1 sec.
MIL operation2 driving cycles
Sequence of operationNone
05C0Z-17

D25466
12
12
(+)
(-)
Shift Solenoid Valve SL1:
05-952- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1142 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SHIFT SOLENOID VALVE(SL1)
(a) Remove the shift solenoid valve SL1.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 25.0 to 5.6 W
(c) Connect the positive (+) lead with a 21 W bulb to terminal
2 and the negative (-) lead to terminal 1 of the solenoid
valve connector, then check the movement of the valve.
OK:
The solenoid makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SL1)
OK
3 INSPECT TRANSMISSION VALVE BODY ASSY(See chapter 2 in the problem
symptoms table)
(SEE PAGE 05-904)
OK:
There are no foreign objects on each valve and they operate smoothly.
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY (SEE PAGE 40-40)
OK
4 INSPECT TORQUE CONVERTER CLUTCH ASSY (SEE PAGE 40-29)
OK:
The torque converter clutch operates normally.
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE PAGE 40-12)

05-956- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1146 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0766 SHIFT SOLENOID ºDº PERFORMANCE
(SHIFT SOLENOID VALVE S4)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0766The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve S4 remains open or closed

Valve body is blocked

Shift solenoid valve S4

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the
actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0766:
Shift solenoid valve S4/ON malfunction
Shift solenoid valve S4/OFF malfunction
Required sensors/ComponentsShift solenoid valve S4, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration1 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)60°C (140°F) or more
TFT (Transmission fluid temperature)-20C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuitNot circuit malfunction
Intermediate shaft speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Electronic throttle systemNot circuit malfunction
05C11-19

G28386
Shift Solenoid Valve S4:
(+) (-)
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-959
1149 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SHIFT SOLENOID VALVE(S4)
(a) Remove the shift solenoid valve S4.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
20 C (68 F)
Solenoid Connector (S4) - Solenoid
Body (S4)11 to 15 W
(c) Connect positive (+) lead to the terminal of solenoid con-
nector, negative (-) lead to the solenoid body.
OK:
The solenoid makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(S4)
OK
3 INSPECT TRANSMISSION VALVE BODY ASSY(See chapter 2 in the problem
symptoms table)
(SEE PAGE 05-904)
OK:
There are no foreign objects on each valve and they operate smoothly.
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY (SEE PAGE 40-40)
OK
4 INSPECT TORQUE CONVERTER CLUTCH ASSY (SEE PAGE 40-29)
OK:
The torque converter clutch operates normally.
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE PAGE 40-12)

05-1072- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1262 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0771 SHIFT SOLENOID ºEº PERFORMANCE
(SHIFT SOLENOID VALVE SR)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0771The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SR remains open or closed

Valve body is blocked

Shift solenoid valve SR

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and
the actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCsP0771: Shift solenoid valve SR/Rationality check
Required sensors/ComponentsShift solenoid valve SR, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration
OFF malfunction (A)
1 sec.
OFF malfunction (B)
3.5 sec.
ON malfunction (A)
Continuous
ON malfunction (B) and (C)
0.8 sec.
MIL operation2 driving cycles
Sequence of operationNone
05C12-12

C90640
(+) (-)
Shift Solenoid Valve SR:
05-1076- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1266 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SHIFT SOLENOID VALVE(SR)
(a) Remove the shift solenoid valve SR.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
20C (68F)
Solenoid Connector (SR) - Solenoid
Body (SR)11 to 15 W
(c) Connect positive (+) lead to the terminal of solenoid con-
nector, negative (-) lead to the solenoid body.
OK:
The solenoid makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SR)
OK
3 INSPECT TRANSMISSION VALVE BODY ASSY(See chapter 2 in the problem
symptoms table)
(SEE PAGE 05-1016)
OK:
There are no foreign objects on each valve and they operate smoothly.
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY (SEE PAGE 40-44)
OK
4 INSPECT TORQUE CONVERTER CLUTCH ASSY (SEE PAGE 40-29)
OK:
The torque converter clutch operates normally.
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE PAGE 40-18)

05-960- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1150 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0776 PRESSURE CONTROL SOLENOID ºBº
PERFORMANCE (SHIFT SOLENOID VALVE
SL2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0776The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SL2 remains open or closed

Valve body is blocked

Shift solenoid valve SL2

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the
actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0776:
Shift solenoid valve SL2/OFF malfunction
Shift solenoid valve SL2/ON malfunction
Required sensors/ComponentsShift solenoid valve SL2, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration0.8 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)60°C (140°F) or more
TFT (Transmission fluid temperature)-20C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuitNot circuit malfunction
Intermediate shaft speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Electronic throttle systemNot circuit malfunction
05C13-17