Inspection Procedure

HINT:

Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA ).

1. CHECK DTC OUTPUT 
   1. Connect Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn Techstream on.
   4. Select the following menu items: Powertrain / Engine / Trouble Code.
   5. Read the DTCs.

      Result 

      RESULT CHART
      
      

      Display (DTC output)	Proceed to
      P0110	A
      P0112	B
      P0113	C

   B:  Go to step  6

   C:  Go to step  4

   A: Go to Next Step 

2. READ VALUE OF INTAKE AIR TEMPERATURE SENSOR (INTAKE AIR) 
   1. Connect Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.
   5. Read the value displayed on the tester.

      Standard: 

      Same as actual Intake Air Temperature (IAT). 

      Result 

      RESULT CHART
      
      

      Temperature Displayed	Proceed to
      -40°C (-40°F)	A
      140°C (284°F) or higher	B
      Same as actual IAT	C

      HINT:

      • If there is an open circuit, Techstream indicates -40°C (-40°F).
      • If there is a short circuit, Techstream indicates 140°C (284°F) or higher.

   B:  Go to step  5

   C: CHECK FOR INTERMITTENT PROBLEMS (See  PROBLEM SYMPTOMS TABLE  ) 

   A: Go to Next Step 

3. CHECK MASS AIR FLOW METER (CHECK FOR OPEN IN SENSOR) 
   Fig 1: Identifying Terminals Of B33 MAF Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Confirm good connection of the Mass Air Flow (MAF) meter.
   2. Disconnect the B33 MAF meter connector.
   3. Connect terminals THA and E2 of the MAF meter wire harness side connector.
   4. Connect Techstream to the DLC3.
   5. Turn the engine switch on (IG).
   6. Turn the tester on.
   7. Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.
   8. Read the value displayed on the tester.

      Standard: 

      140°C (284°F) or higher 

   9. Reconnect the MAF meter connector.

   OK: REPLACE MASS AIR FLOW METER (See  REMOVAL  ) 

   NG: Go to Next Step 

4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
   1. Disconnect the B33 MAF meter connector.
   2. Disconnect the B12 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      THA (B12-71) - THA (B33-1)	Below 1 Ω
      ETHA (B12-74) - E2 (B33-2)	Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      THA (B12-71) or THA (B33-1) - Body ground	10 kΩ or higher
      ETHA (B12-74) or E2 (B33-2) - Body ground	10 kΩ or higher

      Fig 2: Identifying Terminals Of B33 MAF Meter And B12 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the MAF meter connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM (See  REMOVAL  ) 

5. CHECK MASS AIR FLOW METER (CHECK FOR SHORT IN SENSOR) 
   Fig 3: Identifying B33 MAF Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the B33 MAF meter connector.
   2. Connect Techstream to the DLC3.
   3. Turn the engine switch on (IG).
   4. Turn the tester on.
   5. Enter the following menus: Powertrain / Engine / Data List/All Data/Intake Air.
   6. Read the value displayed on the tester.

      Standard: 

      -40°C (-40°F) or higher 

   7. Reconnect the MAF meter connector.

   OK: REPLACE MASS AIR FLOW METER (See  REMOVAL  ) 

   NG: Go to Next Step 

6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER- ECM) 
   1. Disconnect the B33 MAF meter connector.
   2. Disconnect the B12 ECM connector.
   3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      THA (B12-71) or THA (B33-1) - Body ground	10 kΩ or higher

      Fig 4: Identifying Terminals Of B33 MAF Meter And B12 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the MAF meter connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM (See  REMOVAL  )