o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1089
1279 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0796 PRESSURE CONTROL SOLENOID ºCº
PERFORMANCE (SHIFT SOLENOID VALVE
SL3)
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
troubles of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0796The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SL3 remains open or closed

Valve body is blocked

Shift solenoid valve SL3

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 DTCs
P0796:
Shift solenoid valve SL3/OFF malfunction
Shift solenoid valve SL3/ON malfunction
Required sensors/ComponentsShift solenoid valve SL3, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration
OFF malfunction (A)
0.8 sec.
OFF malfunction (B)
1 sec.
ON malfunction (A) and (B)
0.8 sec.
ON malfunction (C)
0.4 sec.
MIL operation2 driving cycles
Sequence of operationNone
05C15-12

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

05-1094- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1284 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0798 PRESSURE CONTROL SOLENOID ºCº
ELECTRICAL (SHIFT SOLENOID VALVE
SL3)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR 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
operated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0798
ECM checks for an open or short circuit in shift solenoid valves
SL3 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL3 circuit

Shift solenoid valve SL3

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 05-1030).
MONITOR STRATEGY
Related DTCsP0798: Shift solenoid valve SL3/Range check
Required sensors/ComponentsShift solenoid valve SL3
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 05-1007
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C16-22

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-971
1161 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0982 SHIFT SOLENOID ºDº CONTROL CIRCUIT
LOW (SHIFT SOLENOID VALVE S4)
DTC P0983 SHIFT SOLENOID ºDº CONTROL CIRCUIT
HIGH (SHIFT SOLENOID VALVE S4)
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
P0982ECM detects short in solenoid valve S4 circuit 2 times when
solenoid valve S4 is operated (1-trip detection logic)
Short in shift solenoid valve S4 circuit

Shift solenoid valve S4

ECM
P0983ECM detects open in solenoid valve S4 circuit 2 times when
solenoid valve S4 is not operated (1-trip detection logic)
Open in shift solenoid valve S4 circuit

Shift solenoid valve S4

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 DTCsP0982: Shift solenoid valve S4/Range check (Low resistance)
P0983: Shift solenoid valve S4/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S4
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P0982: Range check (Low resistance)
The monitor will run whenever this DTC is not present.See page 05-895
Shift solenoid valve S4ON
Battery voltage8 V or more
Ignition switchON
StarterOFF
P0983: Range check (High resistance)
The monitor will run whenever this DTC is not present.See page 05-895
Shift solenoid valve S4OFF
Battery voltage8 V or more
Ignition switchON
StarterOFF
05C17-23

05-1 100- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1290 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0985 SHIFT SOLENOID ºEº CONTROL CIRCUIT
LOW (SHIFT SOLENOID VALVE SR)
DTC P0986 SHIFT SOLENOID ºEº CONTROL CIRCUIT
HIGH (SHIFT SOLENOID VALVE SR)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR 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
operated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0985ECM detects short in solenoid valve SR circuit 2 times when
solenoid valve SR is operated (1-trip detection logic)
Short in shift solenoid valve SR circuit

Shift solenoid valve SR

ECM
P0986ECM detects open in solenoid valve SR circuit 2 times when
solenoid valve SR is not operated (1-trip detection logic)
Open in shift solenoid valve SR circuit

Shift solenoid valve SR

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 05-1030).
MONITOR STRATEGY
Related DTCsP0985: Shift solenoid valve SR/Range check (Low resistance)
P0986: Shift solenoid valve SR/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve SR
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P0985: Range check (Low resistance)
The monitor will run whenever this DTC is not present.See page 05-1007
Shift solenoid valve SRON
Battery voltage8 V or more
Ignition switchON
StarterOFF
P0986: Range check (High resistance)
The monitor will run whenever this DTC is not present.See page 05-1007
Shift solenoid valve SROFF
Battery voltage8 V or more
Ignition switchON
StarterOFF
05C18-12

- 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

A87825
T13
Throttle
Actuator
2
1B
WECM
M+
M- Shielded
GE01 M+
M-
E92
E9 E93
17 05-244
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
434 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsP2102: Throttle actuator current (low current)
P2103: Throttle actuator current (high current)
Required sensors / components (Main)Throttle actuator
Required sensors / components (Related)-
Frequency of operationContinuous
Duration2 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
P2102:
Throttle actuator duty ratio80 % or more
Throttle actuator power supply8 V or more
P2103:
Throttle actuator power supply8 V or more
Battery voltage8 V or more
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
P2102:
Throttle actuator currentLess than 0.5 A
P2103:
Either of the following conditions is met:Condition 1 or 2
1. Hybrid IC diagnosis signalFail ( for 0.1 sec.)
2. Hybrid IC current limiter portFail (for 0.6 sec.)
WIRING DIAGRAM

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-247
437 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2111 THROTTLE ACTUATOR CONTROL SYSTEM
- STUCK OPEN
DTC P2112 THROTTLE ACTUATOR CONTROL SYSTEM
- STUCK CLOSED
CIRCUIT DESCRIPTION
The throttle actuator is operated by the ECM and it opens and closes the throttle valve using gears. 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 to control the throttle actuator and set the
throttle valve 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
P2111Throttle valve locked during ECM order to close
(1 trip detection logic)

Throttle actuator circuit

Throttle actuator

Throttle body

Throttle valve
P2112Throttle valve locked during ECM order to open
(1 trip detection logic)
Same as DTC No. P2111
MONITOR DESCRIPTION
The ECM concludes that there is a malfunction of the ETCS when the throttle valve remains at a fixed angle
despite high drive current from the ECM. The ECM will turn on the MIL and will set a DTC.
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.
MONITOR STRATEGY
Related DTCsP2111: Throttle actuator stuck open
P2112: Throttle actuator stuck closed
Required sensors/ components (Main)Throttle actuator
Required sensors/ components (Related)-
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
05EVS-05

05-248
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
438 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not presentSee page 05-16
P2111:
Throttle motor current2 A or more
Throttle actuator close duty ratio80 % or more
P2112:
Throttle motor current2 A or more
Throttle actuator open duty ratio80 % or more
TYPICAL MALFUNCTION THRESHOLDS
TP (throttle position) sensor voltage change for 0.016 se-
condLess than 0.1 V
WIRING DIAGRAM
Refer to DTC P2102 on page 05-243.
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 CHECK OTHER DTC OUTPUT
Display (DTC output)Proceed to
P2111 or P2112A
P2111 or P2112 and other DTCsB
B GO TO RELEVANT DTC CHART (See page
05-48)
A
2 CHECK THROTTLE BODY ASSY (VISUALLY CHECK THROTTLE VALVE)
Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body.
And check that the throttle valve moves smoothly.
OK: The throttle valve is not contaminated with foreign objects and can move smoothly.
NG REPLACE THROTTLE BODY ASSY (See page
10-6)
OK

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-251
441 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 the ignition switch is turned OFF, the fail-safe operation will stop and
the system will return to normal.
MONITOR STRATEGY
Related DTCsP2118: Throttle actuator power supply
Required sensors / components (Main)Throttle actuator, ETCS fuse
Required sensors / components (Related)-
Frequency of operationContinuous
Duration0.8 seconds
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
Battery voltageMore than 8 V
TYPICAL MALFUNCTION THRESHOLDS
Throttle actuator power supply voltageLess than 4 V
COMPONENT OPERATING RANGE
Throttle actuator power supply voltage9 to 14 V