Toyota Tundra (2015 year). Manual — part 1262
(a) VPA2 voltage
1.2 V or less
(b) VPA voltage - Learned VPA accelerator off position voltage
0.04 V or more
P2128
VPA2 voltage when VPA voltage 0.4 V or more, and 3.45 V or less
4.8 V or more
P2138
Condition A
-
Difference between VPA and VPA 2 voltages
0.02 V or less
Condition B
-
VPA voltage
0.4 V or less
VPA2 voltage
1.2 V or less
COMPONENT OPERATING RANGE
VPA voltage
0.4 to 4.8 V
VPA2 voltage
1.2 to 4.8 V
Difference between VPA and VPA2 voltages
More than 0.02 V
CONFIRMATION DRIVING PATTERN
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
3.
Turn the ignition switch off and wait for at least 30 seconds.
4.
Turn the ignition switch to ON and turn the Techstream on [A].
5.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2120,P2122,...
Fully depress and release the accelerator pedal [B].
6.
Check that 5 seconds or more have elapsed since the ignition switch was turned to ON.
7.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
8.
Read the pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
9.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10.
Input the DTC: P2120, P2122, P2123, P2125, P2127, P2128 or P2138.
11.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
12.
If no pending DTC is output, perform a universal trip and check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
13.
FAIL-SAFE
When DTC P2120, P2121, P2122, P2123, P2125, P2127, P2128 or P2138 is stored, the ECM enters failsafe mode.
the engine idles.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.
WIRING DIAGRAM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2120,P2122,...
INSPECTION PROCEDURE
HINT:
These DTCs relate to the Accelerator Pedal Position (APP) sensor.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, 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.
PROCEDURE
1.
READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT /
Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
(e) Read the value displayed on the Techstream.
Standard Voltage:
ACCELERATOR
PEDAL
OPERATION
ACCEL
SENSOR
OUT NO. 1
ACCEL
SENSOR
OUT NO. 2
DIFFERENCE BETWEEN
ACCEL SENSOR OUT NO.
1 AND ACCEL SENSOR
OUT NO. 2
Released
0.5 to 1.1
V
1.2 to 2.0
V
More than 0.02 V
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2120,P2122,...
A
ACCELERATOR
PEDAL
OPERATION
ACCEL
SENSOR
OUT NO. 1
ACCEL
SENSOR
OUT NO. 2
DIFFERENCE BETWEEN
ACCEL SENSOR OUT NO.
1 AND ACCEL SENSOR
OUT NO. 2
Depressed
2.6 to 4.5
V
3.4 to 4.75
V
Result
RESULT
PROCEED TO
NG
A
OK
B
B
GO TO STEP 5
2.
CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)
(a) Disconnect the APP sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
A14-6 (VPA) - A24-55 (VPA)
Always
Below 1 Ω
A14-5 (EPA) - A24-58 (EPA)
Always
Below 1 Ω
A14-4 (VCPA) - A24-57 (VCPA)
Always
Below 1 Ω
A14-3 (VPA2) - A24-56 (VPA2)
Always
Below 1 Ω
A14-2 (EPA2) - A24-60 (EPA2)
Always
Below 1 Ω
A14-1 (VCP2) - A24-59 (VCP2)
Always
Below 1 Ω
A14-6 (VPA) or A24-55 (VPA) -
Body ground
Always
10 kΩ or higher
A14-5 (EPA) or A24-58 (EPA) -
Body ground
Always
10 kΩ or higher
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2120,P2122,...
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