2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 1681 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 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 (

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TOYOTA HIGHLANDER 2001 Service Repair Manual 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 se

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-1 10
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
300 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)
(a) Clear the DTC (see page 05

Page 1685 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 11
301 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºAº CIRCUIT
RANGE/PERFORMANCE PROBLEM
HINT:
Thi

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 11
301 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºAº CIRCUIT
RANGE/PERFORMANCE PROBLEM
HINT:
This is the purpose of the ºthrottle position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page 05-102.
DTC No.DTC Detection ConditionTrouble Area
P0121
Condition (a) continues for 2.0 seconds:
(a) Difference between VTA1 and VTA2 deviates from thresh-
old
Throttle position sensor
MONITOR DESCRIPTION
The ECM uses the throttle position sensor to monitor the throttle valve opening angle.
This sensor includes 2 signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2
is used to detect malfunctions in VTA1. There are several checks that the ECM performs to confirm proper
operation of the throttle position sensor and VTA1.
There is a specific voltage difference between VTA1 and VTA2 for each throttle opening angle.
If the voltage output difference between the VTA1 and VTA2 deviates from the normal operating range, the
ECM interprets this as a malfunction of the throttle position sensor. The ECM will turn on the MIL and will
set a DTC.
FAIL-SAFE
If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle
control motor. 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 (inter-
mittent 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 DTCsP0121: TP (Throttle position) sensor rationality
Required sensors / components (Main)TP sensor
Required sensors / components (Related)-
Frequency of operationContinuous
Duration2 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
052NE-53

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-1 12
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
302 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
Difference in learning voltage value of (VTA1 - VTA2 y0.8)Less t

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 13
303 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0125 INSUFFICIENT COOLANT TEMPERATURE
FOR CLOSED LOOP FUEL CONTROL
CIRCUIT DESCRIPTION
Refer

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 13
303 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0125 INSUFFICIENT COOLANT TEMPERATURE
FOR CLOSED LOOP FUEL CONTROL
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page 05-95.
DTC No.DTC Detection ConditionTrouble Area
If ECT (engine coolant temperature) or IAT (intake air temper-
ature) is less than -19.45°C (-3°F) at engine start; 20 min-
utes or more after starting engine, ECT sensor value is 20°C
(68°F) or less (2 tripdetection logic)
P0125
(68°F) or less (2 trip detection logic)
If ECT and IAT are between -19.45°C (-3°F) and -8.34°C
(17°F) at engine start; 5 minutes or more after starting en-
gine, ECT sensor value is 20°C (68°F) or less (2 trip detec-
ti l i )
Cooling system
ECT sensor
Thermostat
tion logic)
If ECT and IAT greater than -8.34°C (17°F) at engine start; 2
minutes or more after starting engine, ECT sensor value is
20°C (68°F) or less (2 trip detection logic)
MONITOR DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is used to monitor the temperature of the engine coolant.
The resistance of the sensor varies with the actual coolant temperature. The ECM applies a voltage to the
sensor and the varying resistance of the sensor causes the signal voltage to vary. The ECM monitors the
ECT signal voltage after engine start-up.
If, after sufficient time has passed, the sensor still reports that the
engine is not warm enough for closed-loop fuel control, the ECM interprets this as a fault in the sensor or
cooling system and sets a DTC.
Example:
The ECT is 0C (32F) at engine start. After 5 minutes running time, the ECT sensor still indicates that the
engine is not warm enough to begin active feedback control of the air-fuel ratio. The ECM interprets this as
a fault in the sensor or cooling system and sets a DTC.
MONITOR STRATEGY
Related DTCsP0125: Insufficient ECT (Engine coolant temperature) for closed loop
Required sensors/components (Main)Thermostat, cooling sysem
Required sensors/components (Related)ECT sensor, MAF meter
Frequency of operationContinuous
Duration
2 minutes: Engine start ECT is -8.34C (17F) or more
5 minutes: Engine start ECT is -19.45 to -8.34C (-3 to 17F)
20 minutes: Engine start ECT is less than -19.45C (-3F)
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not
presentSee page 05-16
Fuel cutOFF
EngineRunning
IdleOFF
TYPICAL MALFUNCTION THRESHOLDS
Time until ºactual ECTº reaches ºClosed Loop ECTº
2 minutes: Engine start ECT is -8.34C (17F) or more
5 minutes: Engine start ECT is -19.45 to -8.34C (-3 to 17F)
20 minutes: Engine start ECT is less than -19.45C (-3F)
05ESW-05

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-1 14
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
304 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneousl

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