TOYOTA HIGHLANDER 2001 Service Repair Manual

C58536
1 2
Sensor Side:
(Connector Front View):
T3
C82158C91565
NT+
NT-
E7E8E9E6E5
ECM:
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-939
1129 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SPEED SENSOR(NT)
(a) Disconnect the speed sensor connector from the trans-
axle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2560 to 680 W
NG REPLACE SPEED SENSOR(NT)
OK
3 CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 27 (NT+) - E8 - 35 (NT-)500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 27 (NT+) - E8 - 35 (NT-)560 to 680 W
(d) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
E8 - 27 (NT+) - Body ground10 kW or higher
E8 - 35 (NT-) - Body ground=
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (SEE PAGE 01-36)
OK
REPLACE ECM (SEE PAGE 10-9)

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TRANSAXLE [ECT] (U241E/U140F)
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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

G30837G32448
ECM
STP
E6 19
BR
4M BPassenger Side J/B
Instrument Panel J/B S15
Stop Light SW
F7
FL Block
Battery FL MAINW
ALT1
1A 3
112
1E
1 2
Y
STOP 4L
2B 1
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

E65594
Free Pushed in2
3
41
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INSPECTION PROCEDURE
HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten labor time.
(a) Turn the ignition switch off.
(b) Connect the OBD II scan tool or hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Push the ºONº button of the OBD II scan tool or the hand-held tester.
(e) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LISTº.
(f) According to the display on tester, read the ºDATA LISTº.
ItemMeasurement Item/
Range (display)Normal Condition
STOP LIGHT SWStop light SW Status/
ON or OFF
Brake Pedal is depressed: ON

Brake Pedal is released: OFF
1 INSPECT STOP LAMP SWITCH ASSY
(a) Remove the stop lamp switch assy.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Switch positionTester ConnectionSpecified Condition
Switch pin free1 - 210 kW or higher
Switch pin pushed in=Below 1 W
Switch pin free3 - 4Below 1 W
Switch pin pushed in=10 kW or higher
NG REPLACE STOP LAMP SWITCH ASSY
OK

G26289
STP(+)
E7E8E9E6E5
ECM:
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-943
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH ASSY - ECM)
(a) Connect the stop lamp switch assy connector.
(b) Measure the voltage according to the value(s) in the table
below when the brake pedal is depressed and released.
Standard:
ConditionTester ConnectionSpecified Condition
Brake pedal is depressedE6 - 19 (STP) -
Body ground10 to 14 V
Brake pedal is released=Below 1 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (SEE PAGE 01-36)
OK
REPLACE ECM (SEE PAGE 10-9)

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-949
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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

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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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
OFF malfunction
ECM selected gear1st
Vehicle speed10 to 40 km/h (6.2 to 24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (A)
ECM selected gear2nd
Vehicle speed10 km/h (6.2 mph) or more
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (B)
ECM lock-up commandOFF
ECM selected gear3rd or 4th
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction, or ON malfunction (A) and (B)
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
OFF malfunction
Input (turbine) speed/Intermediate shaft speed1.49 to 1.63
ON malfunction (A)
Input (turbine) speed/Intermediate shaft speed2.72 to 2.86
ON malfunction (B)
Engine speed - Input (tubine) speed250 rpm or more

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INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Turn the ignition switch off.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Push the ºONº button of the hand-held tester.
(e) Select the item ºDIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SHIFTº.
(f) According to the display on tester, perform the ºACTIVE TESTº.
HINT:
While driving, the shift position can be forcibly changed with the hand-held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (see page 05-916).
ItemTest DetailsDiagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set the each shift position by your-
self.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]

Press º"º button: Shift up

Press ºuº button: Shift down
Possible to check the operation of
the shift solenoid valves.
HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the hand-held
tester.
1 CHECK OTHER DTCS OUTPUT(IN ADDITION TO DTC P0746)
(a) Connect the OBD II scan tool or the hand-held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main
switch ON.
(c) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODESº.
(d) Read the DTCs using the OBD II scan tool or the hand-held tester.
Result:
Display (DTC output)Proceed to
Only ºP0746º is outputA
ºP0746º and other DTCsB
HINT:
If any other codes besides ºP0746º is output, perform the troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART
(SEE PAGE 05-920)
A

D25466
12
12
(+)
(-)
Shift Solenoid Valve SL1:
05-952- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
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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)

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0748 PRESSURE CONTROL SOLENOID ºAº
ELECTRICAL (SHIFT SOLENOID VALVE
SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL1 circuit

Shift solenoid valve SL1

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0748: Shift solenoid valve SL1/Range check
Required sensors/ComponentsShift solenoid valve SL1
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C10-19