Sfi System - P2121(2006/01 - 2007/12)

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 no. 1 and accelerator position no. 2)

  7. Replace accelerator pedal position sensor

  8. Check whether dtc output recurs (dtc p2121)

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


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DESCRIPTION


HINT:
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 (APP) sensor
  1. ECM

FAIL-SAFE

The APP 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 opening angle to allow the vehicle to continue driving. If both circuits malfunction, the ECM regards the opening 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 (Click here).

INSPECTION PROCEDURE

HINT:
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 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.
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 the ON position and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P2121
    		A
    P2121 and other DTCs
    		B
    HINT:
    If any DTCs other than P2121 are output, troubleshoot those DTCs first.


Bnext
GO TO DTC CHART
A
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2.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION NO. 1 AND ACCELERATOR POSITION NO. 2)
  1. Connect the intelligent tester to the DLC3. Camry

  2. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

  1. Read the values displayed on the tester.

    Standard voltage:
    Accelerator Pedal Operation
    		Accelerator Position No. 1
    		Accelerator Position No. 2
    Released → Depressed → Released
    		0.5 to 4.5 V
    		1.2 to 5.0 V
    Difference between Accelerator Position No. 1 and Accelerator Position No. 2 is greater than 0.02 V
    		Difference between Accelerator Position No. 1 and Accelerator Position No. 2 is greater than 0.02 V


OKnext
CHECK FOR INTERMITTENT PROBLEMS
NG
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3.REPLACE ACCELERATOR PEDAL POSITION SENSOR

NEXT
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4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the tester on.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P2121
    		A
    No output
    		B


Bnext
SYSTEM OK
A
next down
REPLACE ECM