2001 TOYOTA HIGHLANDER o2 sensor

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
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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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433 Author
: Date
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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
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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)
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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

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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)
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:
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

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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445 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2119 THROTTLE ACTUATOR CONTROL
THROTTLE BODY RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The Electronic Throttle Control System (ETCS) is composed of a throttle actuator that operates the throttle
valve, a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal
position sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system.
The ECM operates the throttle actuator to position the throttle valve for proper response to driver inputs. The
throttle position sensor, which is mounted on the throttle body, detects the opening angle of the throttle valve
and provides this signal to the ECM so that the ECM can regulate the throttle actuator.
DTC No.DTC Detection ConditionTrouble Area
P2119
Throttle opening angle continues to vary greatly from target
throttle opening angle
(1 trip detection logic)
Electronic throttle control system

ECM
MONITOR DESCRIPTION
The ECM determines the ºactualº throttle angle based on the throttle position sensor signal. The ºactualº
throttle position is compared to the ºtargetº throttle position commanded by the ECM. If the difference be-
tween these two values exceeds a specified limit, the ECM interprets this as a fault in the ETCS system. The
ECM 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.
MONITOR STRATEGY
Related DTCsP2119: ETCS malfunction
Required sensors / components (Main)Throttle actuator
Required sensors / components (Related)-
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
Difference between ºtarget TP (Throttle position)º and ºactu-
al TPº0.3 V or more
WIRING DIAGRAM
Refer to DTC P2102 on page 05-243.
05EVU-05

05-256
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446 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 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P2119)
Display (DTC output)Proceed to
Only P2119 is outputA
P2119 and other codes are outputB
B GO TO RELEVANT DTC CHART (See page
05-48)
A
2 CHECK IF DTC OUTPUT REOCCURS
(a) Clear the DTC (see page 05-38).
(b) Allow the engine to idle for 15 seconds.
(c) Pull the hand brake and shift the gear to D.
(d) Depress the brake pedal securely and the accelerator pedal fully for 5 seconds.
(e) Read the DTC.
HINT:
Actual throttle position (TP) sensor voltage can be confirmed using the hand-held tester [DATA LIST / ALL
/ THROTTLE POS #1].
OK: No DTC is output.
OK NORMAL
NG
REPLACE THROTTLE BODY ASSY