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

Perform confirmation driving pattern.
1. Connect the intelligent tester to the DLC3.
2. Turn the power switch ON.
3. Turn the intelligent 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 minutes or more*1.
7. Let the engine to idle (accelerator pedal fully released) for 2 minutes or more*2.
8. Perform steps *1 and *2 at least 3 times.
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Perform Confirmation Driving Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Read value using intelligent tester (LONG FT#1).
1. Enter the following menus: Powertrain / Engine and ECT / Data List / Long FT#1.
2. Read the values displayed on the tester.
  Standard value:
  
  Within - 15 to +15%
  
  If the result is not within the specified range, perform the inspection below.
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 power switch ON (ACC).
2. Turn the power switch ON (do not start the engine).
3. Turn the intelligent tester ON.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
5. Wait 30 seconds, and read the values on the intelligent tester.
  Standard condition:
  
  Less than 0.07 g/sec.
  - 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 (FUEL TRIM); DTC P0172 SYSTEM TOO RICH (BANK 1) ).