Inspect Thermostat

(a) Remove the thermostat (See page CO-12).

(b) Measure the valve opening temperature of the thermostat.

HINT:

In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

(c) Reinstall the thermostat (See page CO-13).

REPLACE THERMOSTAT

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

ES

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

HINT:

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

The 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 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.

Sensor Output Voltage (V)

Fail-Safe Angle

Throttle Position Sensor

Magnet eCM

Magnet eCM

Fail-Safe Angle

Throttle Valve Opening Angle (° )

Note:

Magnet

The throttle valve opening angle detected by the sensor terminal VTA1 is expressed as a percentage.

Between 10 % and 22 %: Throttle valve fully closed Between 66 % and 98 %: Throttle valve fully open Approximately 19 %: Fail-safe angle (6°)

A122493E04

A122493E04

DTC No.

DTC Detection Condition

Trouble Area

P0120

Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• Throttle Position (TP) sensor (built into throttle body)

• ECM

P0122

Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• TP sensor (built into throttle body)

• Short in VTA1 circuit

• ECM

P0123

Output voltage of VTA1 4.535 V or more for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• TP sensor (built into throttle body)

• Open in VTA1 circuit

• Short between VC and VTA1 circuits

• ECM

P0220

Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• TP sensor (built into throttle body)

• ECM

DTC No.

DTC Detection Condition

Trouble Area

P0222

Output voltage of VTA2 1.75 V or less for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• TP sensor (built into throttle body)

• Short in VTA2 circuit

• ECM

P0223

Output voltage of VTA2 4.8 V or more, and VTA1 between 0.2 V and 2.02 V for 2 seconds when accelerator pedal depressed (1 trip detection logic)

• TP sensor (built into throttle body)

• Open in VTA2 circuit

• Short between VC and VTA2 circuits

• ECM

P2135

Either condition (a) or (b) is met (1 trip detection logic):

(a) Difference between output voltages of VTA1 and VTA2 0.02 V or less for 0.5 seconds or more

(b) Output voltage of VTA1 0.2 V or less, and VTA2 1.75 V or less, for 0.4 seconds or more

• Short between VTA1 and VTA2 circuits

• TP sensor (built into throttle body)

• When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS #1 AND THROTTLE POS #2.

• THROTTLE POS #1 denotes the VTA1 signal, and THROTTLE POS #2 denotes the VTA2 signal. Reference (Normal Condition):

Tester Display

Accelerator Pedal Fully Released

Accelerator Pedal Fully Depressed

THROTTLE POS #1

0.5 to 1.1 V

3.3 to 4.9 V

THROTTLE POS #2

2.1 to 3.1 V

4.6 to 5.0 V

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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