Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. READ VALUE OF INTELLIGENT TESTER (MASS AIR FLOW RATE) 
   1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
   2. Allow the engine to idle.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.
   4. Read the values displayed on the tester.

      Result 

      VALUE OF INTELLIGENT TESTER (MASS AIR FLOW RATE)
      
      

      Mass Air Flow Rate (g/second)	Proceed to
      0.0	A
      271.0 or more	B
      MAF rate greater than 1 but less than 270.0*	C

      HINT:

      *: The value must change when the throttle valve is opened or closed.

   B: Go to step   6 

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: GO TO NEXT STEP 

2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Disconnect the M1 Mass Air Flow (MAF) meter connector.
   3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      MASS AIR FLOW METER (POWER SOURCE VOLTAGE)
      
      

      Tester Connection	Specified Condition
      M1-1 (+B) - Body ground	9 to 14 V

      Fig 1: Inspecting Mass Air Flow Meter (Power Source Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step   5 

   OK: GO TO NEXT STEP 

3. INSPECT ECM (VG VOLTAGE) 
   1. Start the engine.
   2. Measure the voltage of the E5 ECM connector.

      HINT:

      Move the shift lever to P or N and turn the A/C switch OFF.

      Standard voltage 

      ECM (VG VOLTAGE)
      
      

      Tester Connection	Condition	Specified Condition
      E5-30 (VG) - E5-29 (E2G)	Engine is idling	0.5 to 3.0 V

      Fig 2: Inspecting ECM (VG Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM 

   NG: GO TO NEXT STEP 

4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
   1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE MASS AIR FLOW METER 

5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY) 
   1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK ECM POWER SOURCE CIRCUIT 

6. INSPECT ECM (SENSOR GROUND) 
   1. Measure the resistance of the ECM connector.

      Standard resistance 

      ECM (SENSOR GROUND)
      
      

      Tester Connection	Specified Condition
      E5-29 (E2G) - Body ground	Below 1 Ω

      Fig 3: Identifying ECM (Sensor Ground)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM 

   OK: GO TO NEXT STEP 

7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
   1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE MASS AIR FLOW METER