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DI-794
DIAGNOSTICS - ENGINE (2UZ-FE)
DICNE-02
DTC P2120 Throttle/Pedal Position Sensor/Switch "D"
Circuit
DTC P2122 Throttle/Pedal Position Sensor/Switch "D"
Circuit Low Input
DTC P2123 Throttle/Pedal Position Sensor/Switch "D"
Circuit High Input
DTC P2125 Throttle/Pedal Position Sensor/Switch "E"
Circuit
DTC P2127 Throttle/Pedal Position Sensor/Switch "E"
Circuit Low Input
DTC P2128 Throttle/Pedal Position Sensor/Switch "E"
Circuit High Input
DTC P2138 Throttle/Pedal Position Sensor/Switch
"D"/"E" Voltage Correlation
HINT:
This is the repair procedure for the "Accelerator Pedal Position (APP) sensor".
DI-795
DIAGNOSTICS - ENGINE (2UZ-FE)
CIRCUIT DESCRIPTION
HINT:
S This electrical throttle control system does not use a throttle cable.
S This accelerator pedal position sensor is a non-contact type.
The accelerator pedal position sensor is mounted in the accelerator pedal to detect the angle of the accelera-
tor pedal. This sensor is electronically controlled and uses Hall-effect elements.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes
between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the
actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of
the sensor itself.
The ECM judges the current angle of the accelerator pedal from these signals input from terminals VPA and
VPA2, and the ECM controls the throttle motor based on these signals.
Accelerator Pedal Position Sensor Output Voltage (V)
*1 *2
Accelerator Pedal ECM 5
Position Sensor
Magnet 3.7 to 4.4
IC No. 1 VPA 2.9 to 3.6
EPA
VCPA 1.6
1.4
VPA2
EPA2 25
Usable Range
IC No. 2 VCP2 0
Accelerator Pedal Turning Angle (deg)
Magnet
*1 : Accelerator Pedal Fully Released
*2 : Accelerator Pedal Fully Depressed
A19694 A19803
DI-796
DIAGNOSTICS - ENGINE (2UZ-FE)
DTC Detection Condition
DTC No. Main trouble Area
(Open or short in accelerator pedal position sensor circuit)
Condition (a) continues for 0.5 seconds or more: S Accelerator pedal position sensor
P2120
(a) VPA x 0.4 V or VPA y 4.8 V S ECM
S Accelerator pedal position sensor
Condition (a) and (b) continues for 0.5 seconds or more:
S VCPA circuit open
P2122 (a) VPA x 0.4 V
S VPA circuit open or ground short
(b) VPA2 y 0.04 V
S ECM
S Accelerator pedal position sensor
Condition (a) continues for 2.0 seconds or more:
P2123 S EPA circuit open
(a) VPA y 4.8 V
S ECM
Condition (a) continues for 0.5 seconds or more:
S Accelerator pedal position sensor
P2125 (a) VPA2 x 1.2 V or VPA2 y 4.8 V and 0.4 V x VPA x 3.45
S ECM
V
S Accelerator pedal position sensor
Condition (a) and (b) continues for 0.5 seconds or more:
S VCP2 circuit open
P2127 (a) VPA2 x 1.2 V
S VPA2 circuit open or ground short
(b) VPA y 0.04 V
S ECM
Condition (a) and (b) continues for 2.0 seconds or more: S Accelerator pedal position sensor
P2128 (a) VPA2 y 4.8 V S EPA circuit open
(a) 0.4 V x VPA x 3.45 V S ECM
Condition (a) or (b) continues for 2.0 seconds or more: S VPA and VPA2 circuit are short circuited
P2138 (a) |VPA - VPA2| x 0.02 V S Accelerator pedal position sensor
(b) VPA x 0.4 V and VPA2 x 1.2 V S ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand-held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble area Accelerator pedal completely released Accelerator pedal fully depressed
ACCEL POS #1 ACCEL POS #2 ACCEL POS #1 ACCEL POS #2
VC circuit open 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V
VPA circuit open or ground short 0 to 0.2 V 1.2 to 2.0 V 0 to 0.2 V 3.4 to 5.3 V
VPA2 circuit open or ground short 0.5 to 1.1 V 0 to 0.2 V 2.6 to 4.5 V 0 to 0.2 V
E2 circuit open 4.5 to 5.5 V 4.5 to 5.5 V 4.5 to 5.5 V 4.5 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 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:
When the voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp 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 "pass" 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.
DI-797
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
Accelerator position sensor 1 (VPA) range check
P2120
(Fluttering)
Accelerator position sensor 1 (VPA) range check
P2122
(Low voltage)
Accelerator position sensor 1 (VPA) range check
P2123
(High voltage)
Accelerator position sensor 2 (VPA2) range
Related DTCs P2125
check (Fluttering)
Accelerator position sensor 2 (VPA2) range
P2127
check (Low voltage)
Accelerator position sensor 2 (VPA2) range
P2128
check (High voltage)
Accelerator position sensor correlation range
P2138
check
Required sensors/components Accelerator position sensor
Frequency of operation Continuous
Duration 2 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Ignition switch ON
Throttle control motor power ON
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P2120:
Either of the following conditions is met Condition 1 or 2
1. VPA1 voltage when VPA2 is 0.04 V or more 0.4 V or less
2. VPA1 voltage 4.8 V or more
P2122:
VPA1 voltage when VPA2 is 0.04 V or more 0.4 V or less
P2123:
VPA1 voltage 4.8 V or more
P2125:
Either of the following conditions is met Condition 1 or 2
1. VPA2 voltage when VPA1 is 0.04 V or more 1.2 V or less
2. VPA2 voltage when VPA1 is 0.4 to 3.45 V 4.8 V or more
P2127:
VPA2 voltage when VPA1 is 0.04 V or more 1.2 V or less
P2128:
VPA2 voltage when VPA1 is 0.4 to 3.45 V 4.8 V or more
DI-798
DIAGNOSTICS - ENGINE (2UZ-FE)
P2138:
Either of the following condition is met: Condition 1 or 2
1. Difference between VPA1 and VPA2 voltage 0.02 V or less
2. Both of the following conditions are met: (a) and (b)
(a) VPA1 voltage 0.4 V or less
(b) VPA2 voltage 1.2 V or less
COMPONENT OPERATING RANGE
Parameter Standard Value
VPA voltage More than 0.4 V and less than 4.8 V
VPA2 voltage More than 1.2 V and Less than 4.8 V
Difference between VPA and VPA2 voltages More than 0.02 V
WIRING DIAGRAM
A20
Accelerator Pedal Position Sensor ECM
6 R-G 18 VPA
VPA E3
V-R (*1)
5 V (*2) 20
EPA E3
EPA
26
4 P-G VCPA
VCPA E3
19 VPA2
3 L
VPA2 E3
21
2 LG-R
EPA2 E3
EPA2
27
1 G-R VCP2
VCP2 E3
(*1): Access Cab, Standard Cab
(*2): Double Cab
A19759
DI-799
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Connect hand-held tester, and read the voltage for accelerator pedal position
sensor data.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(c) Enter the following menu: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL
POS #2.
Released
CHECK:
Depressed
FI7052 Read the voltage for the accelerator pedal position sensor data.
OK:
Standard:
Accelerator pedal ACCEL POS #1 ACCEL POS #2
Released 0.5 to 1.1 V 1.2 to 2.0 V
Depressed 2.6 to 4.5 V 3.4 to 5.3 V
OK Go to step 5.
NG
DI-800
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2
EPA and EPA2 circuit between ECM and accelerator pedal position sensor.
Wire Harness Side: PREPARATION:
Accelerator Pedal Position Sensor (a) Disconnect the A20 accelerator pedal position sensor
A20 connector.
(b) Disconnect the E3 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
VCP2 VPA OK:
EPA2 VPA2 VCPA EPA Standard:
A21022
Tester Connection Specified Condition
VPA2 VPA (A20-6) - VPA (E3-18) Below 1
E3
EPA (A20-5) - EPA (E3-20) Below 1
VPA VCPA (A20-4) - VCPA (E3-26) Below 1
VPA2 (A20-3) - VPA2 (E3-19) Below 1
EPA2 EPA2 (A20-2) - EPA2 (E3-21) Below 1
VCP2 (A20-1) - VCP2 (E3-27) Below 1
VPA (A20-6) or VPA (E3-18) -
EPA 10 k or higher
VCPA Body ground
VCP2 B17417
EPA (A20-5) or EPA (E3-20) -
10 k or higher
Body ground
VCPA (A20-4) or VCPA (E3-26) -
10 k or higher
Body ground
VPA2 (A20-3) or VPA2 (E3-19) -
10 k or higher
Body ground
EPA2 (A20-2) or EPA2 (E3-21) -
10 k or higher
Body ground
VCP2 (A20-1) or VCP2 (E3-27) -
10 k or higher
Body ground
NG Repair or replace harness and connector.
OK
DI-801
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM
terminals.
PREPARATION:
A20 (a) Turn the ignition switch ON.
Accelerator Pedal
(b) Disconnect the A20 accelerator pedal position sensor
Position Sensor connector.
Connector CHECK:
Measure the voltage between the specified terminals of the E3
ECM connector.
OK:
Standard:
Tester Connection Specified Condition
EPA2 (-) VCPA (+) VCPA (E3-26) - EPA (E3-20) 4.5 to 5.5 V
VCP2 (E3-27) - EPA2 (E3-21) 4.5 to 5.5 V
E3
EPA (-) VCP2 (+)
B17448
NG Replace ECM (See page SF-82).
OK
4 Replace accelerator pedal assembly (See page SF-80).
Go
DI-802
DIAGNOSTICS - ENGINE (2UZ-FE)
5 Check whether DTC output recurs (DTC P2120, P2122, P2123, P2125, P2127,
P2128 or P2138)
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Disconnect the battery terminals or remove the EFI No. 1 fuse and ETCS fuse (Clear DTCs).
(c) Start the engine.
(d) Drive the engine at idle for 15 seconds or more.
(e) On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / PENDING CODES.
CHECK:
Read the DTC output.
RESULT:
Display (DTC Output) Proceed To
P2120, P2122, P2123,P2125, P2127, P2128 or P2138 A
No output B
B System is OK.
A
Replace ECM (See page SF-82).
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