On-Vehicle Inspection

WARNING: This page is about a different car, the 2007 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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).

INSPECT MASS AIR FLOW METER
1. Read the value using the intelligent tester (MAF).
  NOTE:
  - 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. Connect the intelligent tester to the DLC3.
  2. Turn the engine switch on (IG) (do not run the engine).
  3. Turn the tester ON.
  4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.
  5. Wait 30 seconds, and read the values on the intelligent tester.
    Standard condition:
    
    Less than 0.50 g/sec.
    - If the result is not as specified, replace the MAF meter.
    - If the result is within the specified range, inspect the MAF meter (see INSPECTION ).
Fig 1: Connecting Intelligent Tester To DLC3
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