Toyota RAV4 manuals

Toyota Sienna Service Manual: Mass or Volume Air Flow Circuit Range / Performance Problem

Toyota Sienna Service Manual / Engine / 2Gr-fe engine control system / Sfi system / Diagnostic trouble code chart / Mass or Volume Air Flow Circuit Range / Performance Problem

Mass or Volume Air Flow Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0100 (See page ES-116).

Mass or Volume Air Flow Circuit Range / Performance Problem

MONITOR DESCRIPTION

The MAF meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide an appropriate air-fuel ratio.

Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components of the MAF meter. The voltage level is proportional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.

If there is a defect in the sensor, or an open or short in the circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the MAF meter and sets the DTC.

Example: If the voltage is more than 2.2 V, or less than 0.73 V while idling, the ECM determines that there is a malfunction in the MAF meter and sets the DTC.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Refer to DTC P0100 (See page ES-118).

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. 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.

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the tester on.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read the DTCs.

Result

HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first.

GO TO DTC CHART (See page ES-56)

Mass or Volume Air Flow Circuit
DESCRIPTION The Mass Air Flow (MAF) meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and ...

Intake Air Temperature Circuit
DESCRIPTION The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT. The IAT sensor has a built-in thermistor with a resistance that varies accord ...

Other materials:

DTC check / clear
1. CHECK DTC (USING INTELLIGENT TESTER)  Checking DTCs.  Connect the intelligent tester to the DLC3.  Turn the ignition switch ON. Read DTCs by following the prompts on the tester screen. HINT: Refer to the intelligent tester operator's manual for further deta ...

Slide door lock
INSPECTION 1. INSPECT SLIDE DOOR LOCK REMOTE CONTROL SUB-ASSEMBLY LH Inspect the resistance of the switch. Resistance If the result is not as specified, replace the control assembly. 2. INSPECT SLIDE DOOR LOCK REMOTE CONTROL SUB-ASSEMBLY RH Inspect the resistance of the swit ...

Knock Sensor Circuit Low Input/ Knock Sensor Circuit High Input
DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2) DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2) DESCRIPTION A flat type knock sensor (non-resona ...

В© 2011-2021 Copyright www.tsienna.net