Toyota Sienna Quiz
Engine

Mass air flow meter

In this manual: Engine
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
~2min read

COMPONENTS

Mass air flow meter

ON-VEHICLE INSPECTION

1. INSPECT MASS AIR FLOW METER

INSPECT MASS AIR FLOW METER
NOTICE:
  • Perform the mass air flow (MAF) meter inspection by following the procedures below.
  • Only replace the MAF meter when the MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range or there is foreign matter on the MAF meter platinum hot wire (heater).

(a) Read the values using the 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 the ON position (do not start the engine).

(2) Turn the tester on.

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

(4) Wait 30 seconds, and read the values on the intelligent tester.

Standard condition: Less than 0.70 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.

REMOVAL

1. REMOVE MASS AIR FLOW METER

REMOVE MASS AIR FLOW METER

(a) Disconnect the mass air flow meter connector.

(b) Remove the 2 screws and mass air flow meter.

INSPECTION

1. INSPECT MASS AIR FLOW METER

INSPECT MASS AIR FLOW METER

(a) Visually check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter.

OK: There is no foreign matter.

If the result is not as specified, replace the mass air flow meter.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

INSTALLATION

1. REMOVE MASS AIR FLOW METER

REMOVE MASS AIR FLOW METER

(a) Install the mass air flow meter with the 2 screws.

(b) Connect the mass air flow meter connector.

Test yourself

A quick Toyota Sienna quiz: every answer comes with an explanation and a link to the manual page.