P0122, P0123, P0222, P0223, P2135

DTC Code	DTC Name
P0122	Throttle Position Sensor Circuit Low Input
P0123	Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
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 with motor body 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, each of which transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA2. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA1 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.	DTC Detection Condition	Trouble Area
P0122	The voltage of VTA1 is 0.273 V or less for 0.024 seconds or more. (1 trip detection logic)	Throttle position sensor (built into throttle with motor body assembly) Short in VTA1 circuit Open in VC circuit ECM
P0123	The voltage of VTA1 is more than 4.736 V for 0.024 seconds or more. (1 trip detection logic)	Throttle position sensor (built into throttle with motor body assembly) Open in VTA1 circuit Open in E1 circuit Short between VC and VTA1 circuits ECM
P0222	The voltage of VTA2 is 1.153 V or less for 0.024 seconds or more. (1 trip detection logic)	Throttle position sensor (built into throttle with motor body assembly) Short in VTA2 circuit Open in VC circuit ECM
P0223	The voltage of VTA2 is 4.772 V or more for 0.024 seconds or more. (1 trip detection logic)	Throttle position sensor (built into throttle with motor body assembly) Open in VTA2 circuit Open in E1 circuit Short between VC and VTA2 circuits ECM
P2135	Deviation in voltages of VTA1 and VTA2 exceed thresholds for 0.212 seconds or more. (1 trip detection logic)	Short between VTA1 and VTA2 circuits Throttle position sensor (built into throttle with motor body assembly) ECM

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 / Throttle Position No. 1 and Throttle Position No. 2.

Throttle Position No. 1 is the VTA1 signal, and Throttle Position No. 2 is the VTA2 signal.

Reference (Normal Condition)

GTS Display	Accelerator Pedal Fully Released	Accelerator Pedal Fully Depressed
Throttle Position No. 1	0.213 to 4.772 V	0.213 to 4.772 V
Throttle Position No. 2	0.213 to 4.772 V	0.213 to 4.772 V

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.

A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.
VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.
VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor circuit, and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Click here.
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of between 2500 and 3000 rpm for 40 seconds or more [A].
Drive the vehicle at 10 km/h (6.25 mph) or more for 1 minute or more [B].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read 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: P0122, P0123, P0222, P0223 or P2135.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

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 test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.
Tech Tips
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

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 specified throttle 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 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 ignition switch is then turned off.

WIRING DIAGRAM

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 ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Throttle Position No. 1 and Throttle Position No. 2.

Read the values displayed on the GTS.

Result
When Accelerator Pedal Released		When Accelerator Pedal Depressed		Trouble Area	Proceed to
Throttle Position No. 1 (VTA1)	Throttle Position No. 2 (VTA2)	Throttle Position No. 1 (VTA1)	Throttle Position No. 2 (VTA2)	Trouble Area	Proceed to
0 to 0.213 V	0 to 0.213 V	0 to 0.213 V	0 to 0.213 V	VC circuit open	A
4.772 to 5.0 V	4.772 to 5.0 V	4.772 to 5.0 V	4.772 to 5.0 V	E2 circuit open
0 to 0.213 V, or 4.772 to 5.0 V	0.213 V to 4.772 V	0 to 0.213 V, or 4.772 to 5.0 V	0.213 V to 4.772 V	VTA1 circuit open or ground short
0.213 V to 4.772 V	0 to 0.213 V, or 4.772 to 5.0 V	0.213 V to 4.772 V	0 to 0.213 V, or 4.772 to 5.0 V	VTA2 circuit open or ground short
0.213 to 4.772 V	0.213 to 4.772 V	0.213 to 4.772 V	0.213 to 4.772 V	Throttle position sensor circuit normal	B

B

CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS) Click here

A

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the throttle with motor body assembly connector.
Disconnect the ECM connector.

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

Standard Resistance (Check for open)

Tester Connection	Condition	Specified Condition
A36-19 (VC) - C15-5 (VC)	Always	Below 1 Ω
A36-18 (VTA1) - C15-6 (VTA1)	Always	Below 1 Ω
A36-28 (VTA2) - C15-4 (VTA2)	Always	Below 1 Ω
A36-29 (E1) - C15-3 (E2)	Always	Below 1 Ω

Standard Resistance (Check for short)

Tester Connection	Condition	Specified Condition
A36-19(VC) or C15-5 (VC) - Body ground	Always	10 kΩ or higher
A36-18 (VTA1) or C15-6 (VTA1) - Body ground	Always	10 kΩ or higher
A36-29 (E1) or C15-3 (E2) - Body ground	Always	10 kΩ or higher
A36-29 (E1) or C15-4 (VTA2) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

INSPECT ECM (VC VOLTAGE)

Text in Illustration

*a
Front view of wire harness connector

(to Throttle with Motor Body Assembly)

Disconnect the throttle with motor body assembly connector.
Turn the ignition switch to ON.

Text in Illustration
*a	Front view of wire harness connector (to Throttle with Motor Body Assembly)

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C15-5 (VC) - C15-3 (E2)	Ignition switch ON	4.5 to 5.5 V

NG

REPLACE ECM Click here

OK

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
1. Replace the throttle with motor body assembly Click here.
NEXT

CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs Click here.
Start the engine.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read DTCs.

Result
Result	Proceed to
DTC P0122, P0123, P0222, P0223 and/or P2135 are output	A
DTC is not output	B

A

REPLACE ECM Click here

B

END

SFI SYSTEM, Diagnostic DTC:P0122, P0123, P0222, P0223, P2135