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
HINT: These DTCs relate to the Throttle Position (TP) sensor.
DESCRIPTION
HINT: This ETC (Electrical Throttle Control System) does not use a throttle cable.
The Throttle Position (TP) sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is a non-contact type, and 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 TP sensor has two sensor circuits which each transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. 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 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 |
P0120 | Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic) |
|
P0122 | Output voltage of VTA1 is 0.2 V or less for 2 seconds (1 trip detection logic) |
|
P0123 | Output voltage of VTA1 is 4.535 V or more for 2 seconds (1 trip detection logic) |
|
P0220 | Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic) |
|
P0222 | Output voltage of VTA2 is 1.75 V or less for 2 seconds (1 trip detection logic) |
|
P0223 | Output voltage of VTA2 is 4.8 V or more, and VTA1 is between 0.2 V and 2.02 V, for 2 seconds (1 trip detection logic) |
|
P2135 | Either condition (a) or (b) is met (1 trip detection logic):
|
|
HINT:
Reference (Normal Condition)
MONITOR DESCRIPTION
The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the TP sensor.
If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0120:
P0122:
P0123:
P0220:
P0222:
P0223:
P2135:
COMPONENT OPERATING RANGE
FAIL-SAFE
When any of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) 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 6.5 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 slowly, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
1 READ VALUE OF INTELLIGENT TESTER (THROTTLE POS AND THROTTLE POS #2)
Result
HINT:
2 CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
Standard resistance: Check for open
Check for short
3 INSPECT ECM (VC VOLTAGE)
Standard voltage
4 REPLACE THROTTLE BODY
5 CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
Result
REPLACE ECM
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