P0222

2ZR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction

DTC P0120 - Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction

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

DESCRIPTION
HINT:
- These DTCs relate to the Throttle Position (TP) sensor.

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. 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 TP 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 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.

HINT:
- When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items: Powertrain / Engine and ECT / Data List / ETCS / Throttle Position No.1 and Throttle Position No.2.
- Throttle Position No.1 denotes the VTA1 signal, and Throttle Position No.2 denotes the VTA2 signal.
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.

- 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 sets 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 sets 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 sets a DTC.

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

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P0120:

P0122:

P0123:

P0220:

P0222:

P0223:

P2135 Case 1:

P2135 Case 2:

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, and the throttle valve is returned to a 6° 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 to OFF.

WIRING DIAGRAM

INSPECTION PROCEDURE
HINT: Read freeze frame data using a Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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

1. READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Data List / ETCS / Throttle Position No.1 and Throttle Position No.2.
(e) Read the values displayed on the tester.
Result:

B -- CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle body connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

(d) Reconnect the throttle body connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM (VC VOLTAGE)

(a) Disconnect the throttle body connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:

(d) Reconnect the throttle body connector.
NG -- REPLACE ECM
OK -- Continue to next step.
4. REPLACE THROTTLE BODY
(a) Replace throttle body Removal.
NEXT -- Continue to next step.
5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine.
(f) Allow the engine to idle for 15 seconds or more.
(g) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(h) Read DTCs.
Result:

B -- END
A -- REPLACE ECM