P0123

DTC P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit
DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
DTC P0220 Throttle / Pedal Position Sensor / Switch "B" Circuit
DTC P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
DTC P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input
DTC P2135 Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

DTC Detection Condition (Part 1):

DTC Detection Condition (Part 2):

DESCRIPTION

HINT:
- This Electronic Throttle Control System (ETCS) does not use a throttle cable.
- This throttle position sensor is a non-contact type.

The Throttle Position (TP) sensor is mounted on the throttle body and it detects the opening angle of the throttle valve. This sensor is electronically controlled and uses Hall-effect elements so that accurate control and reliability can be obtained. The throttle position sensor has 2 sensor elements, VTA1 and VTA2, each with their own signal outputs. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. Voltage applied to VTA1 and VTA2 changes between 0 V to 5 V in proportion to the opening angle of the throttle valve. There are several checks that the ECM performs to confirm proper operation of the throttle position sensor.

The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA1 and VTA2, and the ECM controls the throttle actuator to set the throttle valve angle properly in response to driver inputs.

HINT:
- After confirming DTCs, use the intelligent tester to confirm the throttle valve opening%age and throttle position sensor condition. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS AND THROTTLE POS #2.
- THROTTLE POS is the VTA1 signal. THROTTLE POS #2 is the VTA2 signal.

MONITOR DESCRIPTION

Monitor Strategy (Part 1):

Monitor Strategy (Part 2):

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The ECM uses the throttle position sensor to monitor the throttle valve opening angle.

a. There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a fault and will set a DTC.
b. VTA1 and VTA2 each have a specific voltage operating range.
If VTA1 or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.
c. VTA1 and VTA2 should never be close to the same voltage levels.
If VTA1 is within 0.02 V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.

This monitor runs for 2 seconds (the first 2 seconds of engine idle) after the engine is started (1 trip detection logic).

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions, are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 7° 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 opening 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:

Step 1-3:

Step 3(Continued)-5:

INSPECTION PROCEDURE

HINT:
- If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- This is the repair procedure of the throttle position sensor.