- Accelerator pedal sensor assembly
- ECM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIAZ |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P2121; Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance; 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P2121 |
Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance |
DESCRIPTION
HINT:
Refer to DTC P2120 (See page
![2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P2120,P2122,P2123,P2125,P2127,P2128,P2138; Throttle / Pedal Position Sensor / Switch "D" Circuit+](/t3Portal/stylegraphics/info.gif)
).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P2121 |
Either of following conditions 1 or 2 met for 0.5 seconds (1 trip detection logic) 1. Difference between VPA and VPA2 is less than 0.4 V, or higher than 1.2 V. (learned value of accelerator off position) 2. Difference between VPA and VPA2 is greater than or equal to the specified value. |
|
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 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 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and the DTC is stored.
MONITOR STRATEGY
|
Related DTCs |
P2121: Accelerator pedal position sensor rationality |
|
Required Sensors / Components (Main) |
Accelerator pedal position sensor |
|
Required Sensors / Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
-: Case 1 0.5 seconds: Case 2 |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
ALL (Case 1 and Case 2)
|
Monitor runs whenever following DTCs are not present |
None |
|
Either of the following conditions met |
1 or 2 |
|
1. Ignition switch |
ON |
|
2. Command to electronic throttle actuator power |
ON |
|
Accelerator pedal position sensor circuit fail (P2120, P2122, P2123, P2125, P2127, P2128, P2138) |
Not detected |
Case 2
|
VPA2 voltage |
Less than 4.84 V |
|
Either of the following conditions met |
a or b |
|
a) VPA voltage - Learned VPA accelerator off position voltage |
0.04 V or higher |
|
b) VPA2 voltage - Learned VPA2 accelerator off position voltage |
0.04 V or higher |
TYPICAL MALFUNCTION THRESHOLDS
Case 1
|
Difference between VPA voltage and VPA2 voltage (learned value of accelerator off position) |
Less than 0.4 V, or higher than 1.2 V |
Case 2
|
(VPA voltage - Learned VPA accelerator off position voltage) - (VPA2 voltage - Learned VPA2 accelerator off position voltage) |
0.165 V or higher (varies with accelerator position) |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
-
Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page
).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Wait for 5 seconds after turning the ignition switch to ON.
-
Operate the accelerator pedal in accordance with the following procedure [B].
- Enter the following menus: Powertrain / Engine / Data List / Accel Sens. No. 1 Volt %, and Accel Sens. No. 2 Volt %.
- Slowly depress the accelerator pedal until Accel Sens. No. 1 Volt % is approximately 30% and Accel Sens. No. 2 Volt % is approximately 46%, then slowly release the accelerator pedal.
- Enter the following menus: Powertrain / Engine / Trouble Codes [C].
-
Read pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P2121.
-
Check the DTC judgment result.
Techstream 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
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
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.
-
If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page
).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
FAIL-SAFE
The accelerator pedal sensor assembly 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 ECM limits the engine output. If both circuits malfunction, the ECM regards the angle of the accelerator pedal as being fully closed. In this case, the throttle valve remains 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 stops and the system returns to a normal condition.
WIRING DIAGRAM
Refer to DTC P2120 (See page
).
CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) |
(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 / Trouble Codes.
(e) Read the DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC P2121 is output |
A |
|
DTC P2121 and other DTCs are output |
B |
HINT:
If any DTCs other than P2121 are output, troubleshoot those DTCs first.
| B |
|
|
|
2. |
READ VALUE USING TECHSTREAM (ACCEL SENSOR OUT NO. 1 AND ACCEL SENSOR OUT NO. 2) |
|
(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 / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
(e) Read the values displayed on the Techstream.
Standard Voltage:
|
Accelerator Pedal Operation |
Accel Sensor Out No. 1 |
Accel Sensor Out No. 2 |
|---|---|---|
|
Released |
0.5 to 1.1 V |
1.2 to 2.0 V |
|
Depressed |
2.6 to 4.5 V |
3.4 to 4.75 V |
Text in Illustration
|
*a |
Depressed |
|
*b |
Released |
| OK |
|
|
|
3. |
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY |
(a) Replace the accelerator pedal sensor assembly (See page
).
|
|
4. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page
).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Start the engine and warm it up.
(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the DTC: P2121.
(k) Check the DTC judgment result.
Result
|
Result |
Proceed to |
|---|---|
|
NORMAL (DTC is not output) |
A |
|
ABNORMAL (DTC P2121 is output) |
B |
| A |
|
END |
| B |
|
|
|