CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION SENSOR)
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (ACCELERATOR PEDAL POSITION SENSOR)
CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance |
DESCRIPTION
Refer to DTC P2120 (Link).| DTC No. | DTC Detection Condition | Trouble Area |
| P2121 | Difference between VPA and VPA2 less than 0.4 V, or more than 1.2 V for 0.5 seconds (1 trip detection logic) |
|
FAIL-SAFE
The accelerator pedal position sensor has two (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 two sensor circuits and switches to limp mode. In limp mode, the functioning circuit is used to calculate the accelerator pedal position to allow the vehicle to continue driving. If both circuits malfunction, the ECM regards the accelerator pedal as being fully released. 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 normal.
WIRING DIAGRAM
Refer to DTC P2120 (CAMRY_ACV40 RM000000PFY0H6X_08.html).INSPECTION PROCEDURE
- HINT:
- This DTC relates to the accelerator pedal position sensor.
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
| 1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
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.
|
| ||||
| A | |
| 2.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION SENSOR) |
 |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
Read the values displayed on the tester.
- 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 0.4 to 1.2 V Fully Depressed 2.6 to 4.5 V 3.4 to 5.0 V
Text in Illustration *a Depressed *b Released
|
| ||||
| OK | ||
| ||
| 3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (ACCELERATOR PEDAL POSITION SENSOR) |
Replace the accelerator pedal sensor assembly (CAMRY_ACV40 RM0000017UL009X.html).
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).
Start the engine.
Fully depress and release the accelerator pedal.
Check that 20 seconds or more have elapsed since the ignition switch was turned to ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
- Result:
Result Proceed to DTC P2121 is output A DTC is not output B
|
| ||||
| A | ||
| ||