SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.

• P0120, P0122, P0123, P0220, P0222, P0223 and P2135:

• A specific voltage difference is expected between the sensor terminals, VTA and VTA2, for each throttle valve opening angle. If the difference between VTA and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

• VTA and VTA2 each have a specific voltage range. If VTA or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

• VTA and VTA2 should never be close to the same voltage level. If VTA is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor circuit, and stores a DTC.

• P0121:

• This sensor transmits two signals: VTA and VTA2. VTA is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA.

  For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA and VTA2. If the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction in the throttle position sensor. In this case the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

FAIL-SAFE

When any of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 6° throttle valve opening angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the engine switch is turned off.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   READ VALUE USING GTS (THROTTLE POSITION SENSOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG) (or start the engine).

   3. Turn the GTS on.

   4. Enter the following menus: Powertrain / Engine / Data List / All Data / Throttle Position No.1 and Throttle Position No.2.

      
      
      1. Powertrain > Engine > Data List

         Tester Display
         Throttle Position No.1
         Throttle Position No.2

      2. 
         
         1. 
            
      3. 
         
         10. 
             
         11. 
             

   5. Read the values displayed on the GTS.

      Result

      When Accelerator Pedal Fully Released When Accelerator Pedal Fully Depressed (Engine Running) Trouble Area Proceed to Throttle Position No.1 (VTA) Throttle Position No.2 (VTA2) Throttle Position No.1 (VTA) Throttle Position No.2 (VTA2) 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V VCTA circuit open A 4.5 to 4.98 V 4.5 to 4.98 V 4.5 to 4.98 V 4.5 to 4.98 V ETA circuit open 0 to 0.2 V, or 4.5 to 4.98 V 2.1 to 3.1 V (Fail-safe) 0 to 0.2 V, or 4.5 to 4.98 V 2.1 to 3.1 V (Fail-safe) VTA circuit open or shorted to ground 0.6 to 1.4 V (Fail-safe) 0 to 0.2 V, or 4.5 to 4.98 V 0.6 to 1.4 V (Fail-safe) 0 to 0.2 V, or 4.5 to 4.98 V VTA2 circuit open or shorted to ground 0.5 to 1.1 V 2.1 to 3.1 V 3.2 to 4.8 V (Not fail-safe) 4.6 to 4.98 V (Not fail-safe) Throttle position sensor circuit normal B

      Tip:
      

      • The throttle actuator does not operate if the accelerator pedal is depressed while the vehicle is stopped with the engine switch on (IG). Therefore, make sure to start the engine before reading the values displayed on the GTS.

      • DTC P0121 is stored when the VTA and VTA2 output voltages are not consistent with the sensor characteristics. Therefore, check the freeze frame data when this DTC is stored.

        Calculate the voltage of VTA and VTA2 according to Throttle Sensor Volt % and Throttle Sensor #2 Volt % respectively and confirm their consistency.

        Example:

        Throttle Sensor Volt % / 100 (%) x 5 (V) = Throttle Position No.1

        Characteristic Sensor Output
        VTA2 x 0.8 is approximately equal to VTA + 1.11 V
        VTA: Throttle Position No.1
        VTA2: Throttle Position No.2

      • If DTC P0121 is output, proceed to "Check Harness And Connector (Throttle Position Sensor - ECM)".

   
   
   • AClick here
   • BClick here

     GO TO STEP 5

2. Click here

   CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

   
   

   1. Disconnect the throttle body with motor assembly connector.

   2. Disconnect the ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition F37-5 (VC) - F2-34 (VCTA) Always Below 1 Ω F37-6 (VTA) - F2-35 (VTA) Always Below 1 Ω F37-4 (VTA2) - F2-25 (VTA2) Always Below 1 Ω F37-3 (E2) - F2-33 (ETA) Always Below 1 Ω F37-5 (VC) or F2-34 (VCTA) - Body ground Always 10 kΩ or higher F37-6 (VTA) or F2-35 (VTA) - Body ground Always 10 kΩ or higher F37-4 (VTA2) or F2-25 (VTA2) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

3. *a Front view of wire harness connector (to Throttle Body with Motor Assembly)
   Click here

   INSPECT ECM (VC VOLTAGE)

   
   

   1. Disconnect the throttle body with motor assembly connector.

   2. Turn the engine switch on (IG).

   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition F37-5 (VC) - F37-3 (E2) Engine switch on (IG) 4.5 to 5.5 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPLACE ECMClick here

4. Click here

   REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

   
   

   1. Replace the throttle body with motor assembly.

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click here

      Result
      Proceed to NEXT

   
   
   • NEXTClick here
5. Click here

   CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Clear the DTCs.

      Click here

      
      
      1. Powertrain > Engine > Clear DTCs
      2. 
         
      3. 
         

   5. Turn the engine switch off and wait for at least 30 seconds.

   6. Turn the engine switch on (IG).

   7. Turn the GTS on.

   8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

   9. Enter the following menus: Powertrain / Engine / Trouble Codes.

   10. Read the DTCs.

       
       
       1. Powertrain > Engine > Trouble Codes
       2. 
          
       3. 
          

       Result
       Result Proceed to DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223, and/or P2135 are output A DTCs are not output B

   
   
   • A

     REPLACE ECMClick here

   • B

     END