Onvehicle Inspection

NOTICE:

• Perform the MAF meter inspection according to the procedures below.

• Only replace the MAF meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.

1. INSPECT MASS AIR FLOW METER

(a) Perform confirmation driving pattern.

(1) Connect the intelligent tester to the DLC3. Turn the ignition switch ON. Turn the tester ON. Clear the DTCs (see page ES-38). Start the engine and warm it up with all accessory switches OFF (until the engine coolant temperature is 75°C (167°F) or more). Drive the vehicle at 50 km/h (31 mph) or more for 3 or more *1.

Let the engine idle (accelerator pedal fully released) for 2 minutes or more *2. (8) Perform steps *1 and *2 at least 3 times.

(Vehicle Speed)

Warming up

(Vehicle Speed)

Warming up

(b) Read value using intelligent tester (LONG FT#1).

(1) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / LONG FT#1.

(2) Read the values displayed on the tester. Standard value:

If the result is not within the specified range, perform the inspection below. (c) Read value using intelligent tester (MAF). NOTICE:

• Perform the inspection with the vehicle indoors and on a level surface.

• Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle).

• During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.

(1) Turn the ignition switch to ACC.

(2) Turn the ignition switch ON (do not run the engine).

Turn the tester ON.

Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.

Wait 30 seconds, and read the values on the intelligent tester. Standard condition: Less than 0.72 g/s

• If the result is not as specified, replace the MAF meter.

• If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio (see page ES-146).

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

This ETCS (Electronic 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.

Throttle Position Sensor

IC No.1

IC No.2

IC No.1

IC No.2

VTA1

VTA2

VTA1

VTA2

Magnet

Sensor Output Voltage (V) 5.0 4.8

'Fail Safe Angle

Magnet ECM

'Fail Safe Angle

Throttle Valve Opening Angle (degrees)

Note:

The throttle Valve opening angle detected by the sensor terminal VTA1 is expressed as percentages.

Between 10 % and 24 %: Throttle valve fully closed

Between 66 % and 96 %: Throttle valve fully open

Approximately 19 %: Fail-safe angle (6°)

DTC No.

DTC Detection Conditions

Trouble Areas

P0120

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

• TP sensor (built into throttle body)

• ECM

DTC No.

DTC Detection Conditions

Trouble Areas

P0222

Output voltage of VTA2 1.75 V or less for 2 seconds (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 (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) 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)

• ECM

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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