On-Vehicle Inspection

NOTE:

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.

CHECK MASS AIR FLOW METER
1. Perform confirmation driving pattern.
  1. Connect the intelligent tester to the DLC3.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch ON.
  3. Turn the tester ON.
  4. Clear the DTCs (See DTC CHECK/CLEAR ).
  5. Start the engine and warm it up with all accessory switches OFF (until the engine coolant temperature is 75°C (167°F) or more.)
  6. Drive the vehicle at 50 km/h (31 mph) or more for 3 to 5 minutes *1.
  7. Let the engine idle (accelerator pedal fully released) for 2 minutes or more *2.
  8. Perform steps *1 and *2 at least 3 times in Fig 2.
    
    Fig 2: Performing Confirmation Driving Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Read valve using intelligent tester (LONG FT#1).
  1. Select the following menu items: DIAGNOSIS / ENHANCED OBOII / DATA LIST / PRIMARY / LONG FT#1.
  2. Read the values displayed on the tester.
  Standard value: Within -15 to + 15 %
  
  If the result within the specified range perform the inspection below.
3. READ value using intelligent tester (MAF).
  NOTE:
  - Turn off the engine.
  - 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).
  3. Select the following menu items: DIAGNOSIS / ENHANCED OBDII / DATA LIST / PRIMARY / MAF.
  4. Wait 30 seconds, and read the values on the MAF intelligent tester.
  Standard condition: Less than 0.54 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 DTC P0171 SYSTEM TOO LEAN (BANK 1); DTC P0172 SYSTEM TOO RICH (BANK 1); DTC P0174 SYSTEM TOO LEAN (BANK 2); DTC P0175 SYSTEM TOO RICH (BANK 2) ).