engine TOYOTA HIGHLANDER 2001 Service Repair Manual

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

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1073
1263 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)10C (50F) 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 SL3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve DSL circuitNot circuit malfunction
OFF malfunction (A)
ECM selected gear5th
Throttle valve opening angle5% or more
Vehicle speed10 km/h (6.2 mph) or more
OFF malfunction (B)
ECM lock-up commandON
ECM selected gear3rd, 4th or 5th
Vehicle speed25 km/h (15.5 mph)
ON malfunction (A)
ECM lock-up commandOFF
ON malfunction (B)
ECM selected gear1st
Vehicle speedLess than 40 km/h (24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (C)
ECM selected gear3rd
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (D)
ECM selected gear4th or 5th
Duration time from shift command of ECM15 sec. or more

05-1074- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1264 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met:
OFF malfunction (A) and (B), or ON malfunction (A), (B), (C) and (D)
OFF malfunction (A)
Intermediate shaft speed/Output speed1.44 to 1.58
OFF malfunction (B)
Engine speed - Input (turbine) speed
When condition ºOFF malfunction (A)º of shift solenoid ºDº
is detected;
When condition ºOFF malfunction (A)º of shift solenoid ºDº
is not detected;
75 rpm or more
100 rpm or more
ON malfunction (A)
Difference between engine speed and input (turbine) speed150 rpm or more
ON malfunction (B)
Input (turbine) speed/Intermediate shaft speed0.93 to 1.07
ON malfunction (C)
Input (turbine) speed/Intermediate shaft speed0.93 to 1.07
ON malfunction (D)
Input (turbine) speed/Intermediate shaft speed0.64 to 0.74

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

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-961
1151 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
OFF malfunction
ECM selected gear1st
Vehicle speed10 km/h (6.2 mph) or more
Throttle valve opening angle
15% or more
4.5% or more at engine speed 1,900 rpm
(vary with engine speed)
ON malfunction
ECM selected gear3rd or 4th
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)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction or ON malfunction
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 speed0.93 to 1.07
ON malfunction
Input (turbine) speed/Intermediate shaft speed1.49 to 1.63

GND
C93866
1 V/DIV
1 ms/DIV
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-967
1157 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0793 INTERMEDIATE SHAFT SPEED SENSOR
ºAº
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC)
with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriate-
ly controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shift-
ing is performed.
DTC No.DTC Detection ConditionTrouble Area
P0793
ECM detects conditions (a), (b) and (c) continuity for 5 sec. or
more: (1-trip detection logic)
(a) Vehicle speed: 50 km/h (31 mph) or more
(b) Park/neutral position switch (NSW) is OFF
(c) Speed sensor (NC): less than 300 rpm
Open or short in transmission revolution sensor NC (speed
sensor NC) circuit

Transmission revolution sensor NC (speed sensor NC)

ECM
Reference (Using an oscilloscope):
Check the waveform between the terminals NC+ and
NC- of the ECM connector.
Standard: Refer to the illustration.
TerminalNC+ - NC-
Tool setting1V/DIV, 1ms/DIV
Vehicle conditionVehicle speed 30 km/h (19 mph): (3rd gear)
Engine speed 1,400 rpm
MONITOR DESCRIPTION
The NC terminal of ECM detects a revolution signal from the speed sensor (NC) (counter gear rpm). The
ECM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd or O/D gear in the shift position of D, if the counter gear revolution
is less than 300 rpm
*1 although the output shaft revolution is more than 1,000 rpm*2, the ECM detects the
trouble, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 50 km/h (31 mph) or more.
MONITOR STRATEGY
Related DTCsP0793: Speed sensor (NC)/Verify pulse input
Required sensors/ComponentsSpeed sensor (NC), Speed sensor (NT), NSW switch
Frequency of operationContinuous
Duration5 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
EngineRunning
NSW switchOFF
Output shaft rpm1,000 rpm or more
05F3D-05

G31763
ECM
NC+
NC-
E8 34 26
Y
W-G 2 1 C6
Counter Gear Speed Sensor
E8
E1 5V 05-968
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1158 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
Sensor signal rpmLess than 300 rpm
COMPONENT OPERATING RANGE
Counter gear speed sensor (NC)
[HINT]
4th (O/D) when shift lever position is D position (After warming up the engine);

Intermediate shaft speed (NC) becomes close to the engine speed.
WIRING DIAGRAM

BR3795OK NG
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-969
1159 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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) 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 to the ON position.
(e) Push the ºONº button of the OBD II scan tool or the hand-held tester.
(f) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LISTº.
(g) According to the display on tester, read the ºDATA LISTº.
ItemMeasurement Item/
Range (display)Normal Condition
SPD (NC)Counter Gear Speed/
display: 50 r/min
[HINT]
4th (O/D) when shift lever position is D position
(After warming up the engine);

Intermediate shaft speed (NC) becomes close
to the engine speed.
HINT:

SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.

SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph)
or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
1 INSPECT SPEED SENSOR INSTALLATION
(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and transaxle case.
NG REPLACE SPEED SENSOR(NC)
OK

05-1090- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1280 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)10C (50F) 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 SL3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve DSL circuitNot circuit malfunction
OFF malfunction (A)
ECM selected gear4th or 5th
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
OFF malfunction (B)
ECM selected gear4th
Throttle valve opening angle5% or more
Vehicle speed10 km/h (6.2 mph) or more
ON malfunction (A)
ECM selected gear1st
Vehicle speedLess than 40 km/h (24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (B)
ECM selected gear3rd
Throttle valve opening angle7.0% or more at output speed 1,400 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid ºBº (SL2) and ºCº
(SL3)Not detected
ON malfunction (C)
Throttle valve opening angle7.0% or more at output speed 1,050 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid ºBº (SL2)Not detected

- 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