2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 1889 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-255
445 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2119 THROTTLE ACTUATOR CONTROL
THROTTLE BODY RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The Electr

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-255
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

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-256
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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 to

Page 1891 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-257
447 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2120 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT
DTC P2122 THROTTLE/PEDAL POSITION
SE

Page 1892 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A19694A19694A19803
Accelerator Pedal
Position Sensor
ECM Magnet
Magnet
IC No. 2 IC No. 1
EPA2
VCP2 VPA2 EPA
VCPA VPA
Accelerator Pedal Position Sensor Output Voltage (V)Usable Range
Accelerator Pedal

Page 1893 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-259
449 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection Condition
(All of the following are 1 trip detection logic)Trouble Area
P212

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-259
449 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection Condition
(All of the following are 1 trip detection logic)Trouble Area
P2120Condition (a) continues for 0.5 sec. or more:
(a) VPA is 0.2 V or less or VPA is 4.8 V or moreAccelerator pedal position sensor
ECM
P2122VPA is 0.2 V or less for 0.5 sec. or more when VPA2 output
indicates accelerator pedal is opened
Accelerator pedal position sensor
Open in VCP1 circuit
VPA circuit open or ground short
ECM
P2123Condition (a) continues for 2.0 sec. or more:
(a) VPA is 4.8 V or moreAccelerator pedal position sensor
Open in EPA circuit
ECM
P2125Condition (a) continues for 0.5 sec. or more:
(a) (VPA2 is 0.5 V or less) or (VPA2 is 4.8 V or more)Accelerator pedal position sensor
ECM
P2127VPA2 is 0.5 V or less for 0.5 sec. or more when VPA output
indicates accelerator pedal is opened
Accelerator pedal position sensor
Open in VCP2 circuit
VPA2 circuit open or ground short
ECM
P2128
Conditions (a) and (b) continue for 2.0 sec. or more:
(a) VPA2 is 4.8 V or more
(b) VPA is 0.2 V or more and VPA is 3.45 V or lessAccelerator pedal position sensor
Open in EPA2 circuit
ECM
P2138
Condition (a) or (b) continues for 2.0 sec. or more:
(a) Difference between VPA and VPA2 is 0.02 V or less
(b) VPA is 0.2 V or less and VPA2 is 0.5 V or lessVPA and VPA2 circuit are short circuited
Accelerator pedal position sensor
ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138, use the hand-held tester
or the OBD II scan tool to confirm the accelerator pedal position sensor output voltage.
Accelerator pedal position expressed as voltage output
Trouble AreaAccelerator pedal releasedAccelerator pedal depressedTrouble Area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VCP circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
EPA circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2 deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than the threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
The voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
FAIL-SAFE
The accelerator pedal position sensor has 2 (main and sub) sensor circuits. If a malfunction occurs in either
of the sensor circuits, the ECM detects the abnormal signal voltage difference between the 2 sensor circuits
and switches to fail-safe mode. In fail-safe mode, the remaining circuit is used to calculate the accelerator
pedal opening angle to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
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.

Page 1894 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-260
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
450 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCs
P2120: APP (Accelerator pedal position) Sensor 1 range check (chatte

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TOYOTA HIGHLANDER 2001 Service Repair Manual A80021
A27
Accelerator Pedal
Position Sensor
EPA
EPA2
VCP2VPA2VPA
5
2
1 3 46
VCPAE5
E5
E5 E5 E5 E5
28
29
27 23 26 22ECM
EPA
EPA2
VCP2 VPA2VCPAVPA
BR
L G
W B
R
FI7052DepressedReleased
- DIAGNOSTICSSF

Page 1896 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual B53781
A67445A92629
A27
Accelerator Pedal
Position Sensor
VPA
EPA
VCPA
VPA2 EPA2 VCP2 Wire Harness Side
E5
ECM VPA
EPAVCPA
VPA2
EPA2VCP2
A19521
A53765A92544
A27
Accelerator Pedal
Position Sensor
EP

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