P2135
2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit
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
CAUTION / NOTICE / HINT
HINT: This is the purpose for the "throttle position sensor".
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.
NOTE: When a malfunction is detected, the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is canceled until the system returns to normal and the ignition switch is turned OFF.
HINT:
- After confirming DTCs, use the Techstream to confirm the throttle valve opening percentage and closed throttle position switch condition.
- Throttle Sensor Position is the VTA1 signal. 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.
1. 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.
2. 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.
3. 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.
FAIL-SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 7°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0120:
P0122:
P0123:
P0220:
P0222:
P0223:
P2135:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
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 Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. READ VALUE USING TECHSTREAM (THROTTLE POSITION)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / ETCS / Throttle Sensor Position and Throttle Position No. 2.
(d) Read the value.
Result:
B -- CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
(a) Disconnect the T2 throttle body connector.
(b) Disconnect the E4 ECM connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance:
(d) Reconnect the throttle body connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK ECM (VC VOLTAGE)
(a) Disconnect the T2 throttle body connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the ECM.
Standard voltage:
(d) Reconnect the throttle body connector.
NG -- REPLACE ECM
OK -- Continue to next step.
4. REPLACE THROTTLE BODY
(a) Replace the throttle body Removal.
NEXT -- Continue to next step.
5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear the DTC DTC Check / Clear.
(d) Start the engine and allow the engine to idle for 15 seconds or more.
(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(f) Read the DTC.
Result:
B -- SYSTEM OK
A -- REPLACE ECM