2001 TOYOTA HIGHLANDER throttle body

A19755A19802
Throttle Position Sensor ECM
Magnet
Magnet
IC No. 2 IC No. 1
VC
VTA1
E2 VTA2Throttle Position Sensor Output Voltage (V)
Fail-safe Angle
*1
Usable Range
Throttle Valve Opening Angle (deg.)84 6.5
0 5
2.58
2.25
0.95
0.69
Throttle Valve Fully Opened
(Throttle Position expressed as percentage
(VTA1) 64 to 96 %)
Fail-safe Angle 6.5°
(Throttle Position expressed as percentage
(VTA1) about 16 %) Throttle Valve Fully Closed
(Throttle Position expressed as percentage
(VTA1) 10 to 24 %)
*
1:
VTA1 VTA2
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-103
293 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CIRCUIT DESCRIPTION
HINT:

This Electronic Throttle Control System (ETCS) does not use a throttle cable.

This throttle position sensor is a non-contact type.
The throttle position sensor is mounted on the throttle body and it detects the opening angle of the throttle
valve. This sensor is electronically controlled and uses Hall-effect elements, so that accurate control and
reliability can be obtained. The throttle position sensor has 2 sensor elements/signal outputs: VTA1 and
VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1.
Voltage applied to VTA1 and VTA2 change between 0 V and 5 V in proportion to the opening angle of the
throttle valve. There are several checks that the ECM performs to confirm proper operation of the throttle
position sensor and VTA1.
The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA1
and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to
driver inputs.

Y
B53781
A81699A85510
Wire Harness Side
T13
Throttle Position Sensor
VC VTA2VTA1
E2
VC
VTA1
VTA2 E2 E7
ECM
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-107
297 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Hand-held tester:
1 READ VALUE OF HAND-HELD TESTER (THROTTLE POS AND THROTTLE POS
#2)
(a) On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL / THROTTLE POS and THROTTLE POS #2. Read the values.
Result:
Throttle position expressed as percentage and voltage
Accelerator pedal releasedAccelerator pedal depressedTrouble AreaProceed toTHROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)THROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)Trouble AreaProceed to
0 %0 to 0.2 V0 %0 to 0.2 VVC circuit open
100 %4.5 to 5.5 V100 %4.5 to 5.5 VE2 circuit open
0 % or 100 %2.1 to 3.1 V
(fail safe)0 % or 100 %2.1 to 3.1 V
(fail safe)VTA1 circuit open or
ground shortA
about 16 %
(fail safe)0 to 0.2 or 4.5 to 5.5 Vabout 16 %
(fail safe)0 to 0.2 or 4.5 to 5.5 VVTA2 circuit open or
ground short
10 to 24 %2.1 to 3.1 V64 to 96 %
(does not fail safe)4.5 to 5.5 V
(does not fail safe)Throttle position sen-
sor circuit is normalB
B Go to step 5
A
2 CHECK WIRE HARNESS (THROTTLE POSITION SENSOR - ECM)
(a) Disconnect the T13 throttle position sensor connector.
(b) Disconnect the E7 ECM connector.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
T13-5 (VC) - E7-18 (VC)
T13-6 (VTA1) - E7-21 (VTA1)
T13-4 (VTA2) - E7-31 (VTA2)
T13-3 (E2) - E7-28 (E2)
Below 1 W
T13-5 (VC) or E7-18 (VC) - Body ground
T13-6 (VTA1) or E7-21 (VTA1) - Body ground
T13-4 (VTA2) or E7-31 (VTA2) - Body ground
10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK

A76903
E2 (-)VC (+)
E7
ECM
05-108
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
298 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT ECM (VC VOLTAGE)
(a) Disconnect the T13 throttle position sensor connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the ECM connector.
Standard:
Tester ConnectionSpecified Condition
E7-18 (VC) - E7-28 (E2)4.5 to 5.5 V
NG REPLACE ECM (See page 10-9)
OK
4 REPLACE THROTTLE BODY ASSY (See page 10-6)
GO
5 READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)
(a) Clear the DTC (see page 05-38).
(b) Start the engine.
(c) Run the engine at idle for 15 seconds or more.
(d) Read the DTC.
Result:
Display (DTC Output)Proceed to
P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135 are output againA
No DTC outputB
B SYSTEM OK
A
REPLACE ECM (See page 10-9)

Y
B53781
A81699A85510
Wire Harness Side
T13
Throttle Position Sensor
VC VTA2VTA1
E2
VC
VTA1
VTA2 E2 E7
ECM
A76903
VC (+)
E2 E7
ECM
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-109
299 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
OBD II scan tool (excluding hand-held tester):
1 CHECK WIRE HARNESS (THROTTLE POSITION SENSOR - ECM)
(a) Disconnect the T13 throttle position sensor connector.
(b) Disconnect the E7 ECM connector.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
T13-5 (VC) - E7-18 (VC)
T13-6 (VTA1) - E7-21 (VTA1)
T13-4 (VTA2) - E7-31 (VTA2)
T13-3 (E2) - E7-28 (E2)
Below 1 W
T13-5 (VC) or E7-18 (VC) - Body ground
T13-6 (VTA1) or E7-21 (VTA1) - Body ground
T13-4 (VTA2) or E7-31 (VTA2) - Body ground
10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 INSPECT ECM (VC VOLTAGE)
(a) Disconnect the T13 throttle position sensor connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the ECM connector.
Standard:
Tester ConnectionSpecified Condition
E7-18 (VC) - E7-28 (E2)4.5 to 5.5 V
NG REPLACE ECM (See page 10-9)
OK
3 REPLACE THROTTLE BODY ASSY (See page 10-6)
G0

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

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

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-243
433 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR
CIRCUIT LOW
DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR
CIRCUIT HIGH
CIRCUIT DESCRIPTION
The throttle actuator is operated by the ECM and it opens and closes the throttle valve.
The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the
throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to
control the throttle actuator and monitor the throttle opening angle in response to driver inputs.
HINT:
This Electronic Throttle Control System (ETCS) does not use a throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2102
Conditions (a) and (b) continue for 2.0 seconds:
(a) Throttle actuator output duty 80 % or more
(b) Throttle actuator current 0.5 A or less
(1 trip detection logic)
Open in throttle actuator circuit

Throttle actuator

ECM
P2103
Either of following conditions is met:

Throttle actuator current 10 A or more (0.1 seconds)

Throttle actuator current 7 A or more (0.6 seconds)
(1 trip detection logic)
Short in throttle actuator circuit

Throttle actuator

Throttle valve

Throttle body assy

ECM
MONITOR DESCRIPTION
The ECM monitors the flow of electrical current through the electronic throttle actuator, and detects malfunc-
tions or open circuits in the throttle motor based on the value of the electrical current. When the current devi-
ates from the standard, the ECM concludes that there is a fault in the throttle motor. Or, if the throttle valve
is not functioning properly (for example, stuck on), the ECM concludes that there is a fault and turns on the
MIL and a DTC is set.
Example:
When the current is more than 10 A, or the current is less than 0.5 A when the actuator driving duty ratio
is more than 80 %, the ECM concludes that the current is deviated from the standard, turns on the MIL and
a DTC is set.
FAIL-SAFE
If the ETCS has a malfunction, the ECM cuts off current to the throttle actuator. The throttle control valve
returns to a predetermined opening angle (approximately 16) by the force of the return spring. The ECM
then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in
accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimal speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop
and the system will return to normal condition.
05EVQ-05

A59778M- M+
T13
Throttle Actuator
Y
B53781
A81698A85540
Wire Harness Side
M+
M-
E9
ECM
M+ M-
T13
Throttle Actuator
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-245
435 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, and other data from the time the malfunction occurred.
1 INSPECT THROTTLE BODY ASSY (THROTTLE ACTUATOR)
(a) Disconnect the T13 throttle actuator connector.
(b) Measure the resistance of the throttle actuator terminals.
Standard:
Tester ConnectionSpecified Condition
T13-2 (M+) - T13-1 (M-)0.3 to 100 W (20 C (68F))
NG REPLACE THROTTLE BODY ASSY
OK
2 CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM)
(a) Disconnect the T13 throttle actuator connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
T13-2 (M+) - E9-3 (M+)
T13-1 (M-) - E9-2 (M-)Below 1 W
T13-2 (M+) or E9-3 (M+) - Body ground
T13-1 (M-) or E9-2 (M-) - Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK