Air Flow Meter/Sensor: Testing and Inspection

3UZ-FE ENGINE CONTROL SYSTEM: MASS AIR FLOW METER: ON-VEHICLE INSPECTION

NOTICE:
* Perform the MAF meter inspection according to the procedures below.
* Only replace the MAF meter when the MAF value in the DATA LIST (with the engine stopped) is not within the normal operating range or there is foreign matter on the MAF meter platinum hot wire (heater).
1. INSPECT MASS AIR FLOW METER

(a) Read the value using the Techstream.

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) Warm up the engine.

(2) Turn the ignition switch OFF.

(3) Connect Techstream to the DLC3.

(4) Turn the ignition switch ON.

(5) Turn the tester ON.

(6) Enter the following menus:

Select: Powertrain / Engine and ECT / Data List / MAF.

(7) Wait 30 seconds, and read the values on the Techstream.

Specified condition:





(7) If the result is not as specified, replace the MAF meter.

If the result is within the specified range, inspect the MAF meter.

(b) Remove the MAF meter.

(c) Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration.





OK:

There is no foreign material.

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

(d) Install the MAF meter.