Sfi System - P2121(2010/08 - )

Brand:

Toyota

Model Name:

Camry ACV40 GSV40

Manual:

Repair Manual

Section:

2Az-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Fail-safe

  3. Wiring diagram

  4. Inspection procedure

  5. Check any other dtcs output (in addition to dtc p2121)

  6. Read value using intelligent tester (accelerator position sensor)

  7. Replace accelerator pedal sensor assembly (accelerator pedal position sensor)

  8. Check whether dtc output recurs (accelerator pedal position sensor dtcs)

DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance


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DESCRIPTION

Refer to DTC P2120 (Click here).

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)
  1. Accelerator pedal position sensor
  2. ECM

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 (Click here).

INSPECTION PROCEDURE

HINT:
  1. This DTC relates to the accelerator pedal position sensor.
  2. 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)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. 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.


Bnext
GO TO DTC CHART (Click here)
A
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2.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION SENSOR)
Connect the intelligent tester to the DLC3. Camry

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

  1. 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


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Go to step 3
OK
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CHECK FOR INTERMITTENT PROBLEMS (Click here)

3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (ACCELERATOR PEDAL POSITION SENSOR)

  1. Replace the accelerator pedal sensor assembly (Click here).


NEXT
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4.CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Fully depress and release the accelerator pedal.

  1. Check that 20 seconds or more have elapsed since the ignition switch was turned to ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    DTC P2121 is output
    		A
    DTC is not output
    		B


Bnext
END
A
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REPLACE ECM (Click here)