2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 1897 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
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-263
453 Author: Date:
2

Page 1898 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A19521
A53765A92544
A27
Accelerator Pedal
Position Sensor
EPA (-)
VCPA (+)E5
ECM
VCP2 (+) EPA2 (-)
05-264
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
454 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144

Page 1899 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-265
455 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT
RANGE/PERFORMANCE
HINT:
This is repa

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-265
455 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT
RANGE/PERFORMANCE
HINT:
This is repair procedure for the ºaccelerator pedal position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page 05-257.
DTC No.DTC Detection ConditionTrouble Area
P2121
Conditions (a) continue for 0.5 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(1 trip detection logic)Open or short in Accelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has two sensor elements/signal outputs: VPA and VPA2. VPA is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA. When
the difference between the voltage outputs of VPA and VPA2 deviate from the standard, the ECM concludes
the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is set.
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 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.
MONITOR STRATEGY
Related DTCsP2121: TP sensor malfunction
Required sensors / components (Main)Accelerator position sensor
Required sensors / components (Related)-
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
Either of the following conditions is met:Condition 1 or 2
1. Electronic throttle actuator powerON
2. Ignition switchON
TYPICAL MALFUNCTION THRESHOLDS
Learned voltage value of (VTA1 - VTA2)Less than 0.4 V, or more than 1.2 V
05ITH-02

Page 1900 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual FI7052DepressedReleased
05-266
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
456 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
Refer to DTC P2120 on page 05-257.
INSPECTION PROCEDURE
HIN

Page 1901 of 2572

Page 1902 of 2572

Page 1903 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A73819
AtomosphereSolid Electrolyte
(Zirconia Element)
Platinum
Electrode HeaterExhaust Gas
Cover Element
A
A
ECM Monitored
A/F Sensor Voltage
Air-Fuel Ratio Alumina
A - A Section
- DIAGNOSTICSSFI SY

Page 1904 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-270
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
460 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
P2195
Conditions (a) and (b) continue for 2 seconds or

05-270
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
460 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
P2195
Conditions (a) and (b) continue for 2 seconds or more:
(a) A/F sensor voltage is more than 3.8 V
(b) Rear oxygen sensor voltage is 0.15 V or more
(2 trip detection logic)
Open or short in A/F sensor circuit
A/F sensor
A/F sensor heater
EFI relay
Open or short in A/F sensor heater and EFI relay circuits
Air induction system
Fuel pressure
Injector
ECM
P2196
Conditions (a) and (b) continue for 2 seconds or more:
(a) A/F sensor voltage is less than 2.8 V
(b) Rear oxygen sensor voltage is less than 0.85 V
(2 trip detection logic)
Same as DTC No. P2195
HINT:
DTCs P2195 and P2196 indicate a malfunction related to bank 1 of the A/F sensor circuit.
Sensor 1 is the sensor closest to the engine assembly.
After confirming DTC P2195 and P2196, use the hand-held tester or the OBD II scan tool to confirm
A/F sensor output voltage (AFS B1S1) from the ALL menu (to reach the ALL menu: DIAGNOSIS / EN-
HANCED OBD II / DATA LIST / ALL).
The A/F sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan
tool or the hand-held tester.
The ECM controls the voltage of the A1A+ and A1A- terminals of the ECM to a fixed voltage. There-
fore, it is impossible to confirm the A/F sensor output voltage without the OBD II scan tool or the hand-
held tester.
The OBD II scan tool (excluding hand-held tester) displays one fifth of the A/F sensor output voltage
which is displayed on the hand-held tester.
MONITOR DESCRIPTION
Under the air-fuel ratio feedback control, if the voltage output of the A/F sensor indicates RICH or LEAN for
more than a certain period of time, the ECM concludes that there is a fault in the A/F sensor system. The
ECM will turn on the MIL and will set a DTC.
Example:
If the A/F sensor voltage output is less than 2.8 V (very RICH) for 10 seconds even though voltage output
of the heated oxygen sensor output voltage is less than 0.85 V, the ECM sets DTC P2196 or DTC P2198.
If the heated oxygen sensor output voltage is 0.15 V or more but the A/F sensor voltage output is more than
3.8 V (very LEAN) for 10 seconds, DTC P2195 is set.
MONITOR STRATEGY
Related DTCsP2195: A/F Sensor Signal (Bank 1) Stuck Lean
P2196: A/F Sensor Signal (Bank 1) Stuck Rich
Required sensors / components (Main)A/F sensor
Required sensors / components (Related)Rear HO2S
Frequency of operationContinuous
Duration10 sec.
MIL operation2 driving cycles
Sequence of operationNone

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