P2135
3MZ-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: 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 and each transmits a signal, VTA and VTA2. VTA is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA. 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 (Included in HV control ECU).
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 entering the following menus on Techstream: Powertrain / Engine and ECT / Data List / ETCS / Throttle Position and Throttle Position No. 2.
- Throttle Position denotes the VTA signal (expressed in percentages), and Throttle Position No. 2 denotes the VTA2 signal (expressed in voltages).
Reference (Normal Condition):
MONITOR DESCRIPTION
The ECM (Included in HV control ECU) 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, VTA and VTA2, for each throttle valve opening angle. If the difference between VTA and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
- VTA and VTA2 each has a specific voltage range. If VTA or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
- VTA and VTA2 should never be close to the same voltage level. If VTA is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor, and sets a DTC.
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 (Included in HV control ECU) 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°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.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- If other DTCs relating 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 Techstream. The ECM (Included in HV control ECU) 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.
- These DTCs relate to the Throttle Position (TP) sensor.
PROCEDURE
1. READ VALUE USING TECHSTREAM (THROTTLE POS AND THROTTLE POS #2)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / ECTS / Throttle Position No. 1 and Throttle Position No. 2.
(d) Check the values displayed on the tester.
Result:
HINT:
- TP No. 1 denotes Throttle Position No. 1, and TP No. 2 denotes Throttle Position No. 2.
- AP denotes Accelerator Pedal.
- VTA is expressed as percentages, and VTA2 is expressed as voltages.
B -- CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - HV CONTROL ECU)
(a) Disconnect the T2 throttle body connector.
(b) Disconnect the H32 HV control ECU 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 HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT HV CONTROL ECU (VC VOLTAGE)
(a) Disconnect the T2 throttle body connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage between terminals VC and E2 of the H32 HV control ECU connector.
Standard voltage:
(d) Reconnect the throttle body connector.
NG -- REPLACE HV CONTROL ECU
OK -- Continue to next step.
4. REPLACE THROTTLE BODY ASSEMBLY
NEXT -- Continue to next step.
5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn the tester ON.
(c) Clear the DTCs DTC Check / Clear.
(d) Put the engine in inspection mode Inspection Mode Procedure.
(e) Start the engine.
(f) Allow the engine to idle for 15 seconds or more.
(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
(h) Read the DTCs.
Result:
B -- SYSTEM OK
A -- REPLACE HV CONTROL ECU