DTC Code | DTC Name |
---|---|
P0120 | Throttle Pedal Position Sensor / Switch "A" Circuit |
P0121 | Throttle Pedal Position Sensor / Switch "A" Circuit Range / Performance |
P0122 | Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input |
P0123 | Throttle / Pedal Position Sensor / Switch "A" Circuit High Input |
P0220 | Throttle / Pedal Position Sensor / Switch "B" Circuit |
P0222 | Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input |
P0223 | Throttle / Pedal Position Sensor / Switch "B" Circuit High Input |
P2135 | Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation |
DESCRIPTION
Tech Tips
These DTCs relate to the throttle position sensor.
The throttle position sensor is mounted on the throttle body with motor assembly and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds.
The throttle position sensor has 2 sensor circuits, VTA and VTA2 each of which transmits a signal. VTA is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA and VTA2 terminals of the ECM.
As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
---|---|---|---|---|---|
P0120 | Throttle Pedal Position Sensor / Switch "A" Circuit | The output voltage of VTA quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P0121 | Throttle Pedal Position Sensor / Switch "A" Circuit Range / Performance | The difference between the output voltage of VTA and VTA2 is less than 0.8 V, or higher than 1.6 V for 2 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
P0122 | Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input | The output voltage of VTA is 0.2 V or less for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P0123 | Throttle / Pedal Position Sensor / Switch "A" Circuit High Input | The output voltage of VTA is 4.535 V or higher for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P0220 | Throttle / Pedal Position Sensor / Switch "B" Circuit | The output voltage of VTA2 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P0222 | Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input | The output voltage of VTA2 is 1.75 V or less for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P0223 | Throttle / Pedal Position Sensor / Switch "B" Circuit High Input | The output voltage of VTA2 is 4.8 V or higher, and VTA is between 0.2 V and 2.02 V for 2 seconds or more (1 trip detection logic). |
|
Comes on | DTC stored |
P2135 | Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation | Either of the following conditions is met (1 trip detection logic): (a) The difference between the output voltages of VTA and VTA2 is 0.02 V or less for 0.5 seconds or more. (b) The output voltage of VTA is 0.2 V or less, and VTA2 is 1.75 V or less for 0.4 seconds or more. |
|
Comes on | DTC stored |
Tech Tips
When any of these DTCs are output, check the throttle valve opening angle using the GTS. Enter the following menus: Powertrain / Engine / Data List / All Data / Throttle Position No.1 and Throttle Position No.2.
Throttle Position No.1 is the VTA signal, and Throttle Position No.2 is the VTA2 signal.
Reference (Normal Condition) | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
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
Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on [A].
Start the engine.
With the vehicle stationary, fully depress and release the accelerator pedal [B].
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
Tech Tips
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: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
Check the DTC judgment result.
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
Tech Tips
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [D] again.
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.
WIRING DIAGRAM
*a | Throttle Position Sensor (Throttle Body with Motor Assembly) |
CAUTION / NOTICE / HINT
Tech Tips
Read freeze frame data using the GTS. 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
READ VALUE USING GTS (THROTTLE POSITION SENSOR)
Connect the GTS to the DLC3.
Turn the engine switch on (IG) (or start the engine).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Throttle Position No.1 and Throttle Position No.2.
Tester Display |
---|
Throttle Position No.1 |
Throttle Position No.2 |
Read the values displayed on the GTS.
Result | |||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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. Use the following formula to confirm the relative differences in voltage.
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)".
B |
GO TO STEP 5 Click here |
A |
CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
Disconnect the throttle body with motor assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT ECM (VC VOLTAGE)
*a | Front view of wire harness connector (to Throttle Body with Motor Assembly) |
Disconnect the throttle body with motor assembly connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPLACE ECM Click here |
OK |
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY
Replace the throttle body with motor assembly.
Result | ||
---|---|---|
|
NEXT |
CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG).
Turn the GTS on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
Result | ||||||
---|---|---|---|---|---|---|
|
A |
REPLACE ECM Click here |
B |
END |