Inspection Procedure

HINT:

• If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• 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.

1. READ OUTPUT DTC 
   1. Connect Techstream to the DLC3.
   2. Turn the power switch ON (IG) and turn Techstream ON.
   3. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
   4. Read the DTCs.

      Result 

      RESULT CHART
      
      

      Display (DTC Output)	Proceed To
      P0110	A
      P0112	B
      P0113	C

   B:  Go to step  5

   C:  Go to step  3

   A: Go To Next Step 

2. READ VALUE OF TECHSTREAM (INTAKE AIR TEMPERATURE) 
   1. Connect Techstream to the DLC3.
   2. Turn the power switch ON (IG).
   3. Turn Techstream ON.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
   5. Read the value.

      Temperature value: 

      Same as the ambient air temperature. 

      Result 

      RESULT CHART
      
      

      Temperature Displayed	Proceed to
      -40°C (-40°F)	A
      140°C (284°F)	B
      OK (Same as ambient air temperature)	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).

   B:  Go to step  5

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: Go To Next Step 

3. READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the M1 mass air flow meter connector.
      Fig 1: M1 Mass Air Flow Meter Connector And ECM

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect terminals THA and E2 of the mass air flow meter wire harness side connector.
   3. Turn the power switch ON (IG).
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air. Read the value.

      OK: 

      Temperature value: 140°C (284°F) 

   5. Reconnect the mass air flow meter connector.

   OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE MASS AIR FLOW METER 

   Fig 2: Identifying Mass Air Flow Meter Connector Terminal (Front View)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go To Next Step 

4. READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN ECM) 
   1. Disconnect the M1 mass air flow meter connector.
      Fig 3: Mass Air Flow Meter Connector And ECM - Circuit Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect terminals THA and E2 of the E4 ECM connector.

      HINT:

      Before checking, do a visual and contact pressure check for the ECM connector.

   3. Turn the power switch ON (IG).
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air. Read the value.

      OK: 

      Temperature value: 140°C (284°F) 

   5. Reconnect the mass air flow meter connector.

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 4: Identifying E4 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM 

5. READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the M1 mass air flow meter connector.
   2. Turn the power switch ON (IG).
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
   4. Read the value.

      OK: 

      Temperature value:-40°C (-40°F) 

   5. Reconnect the mass air flow meter connector.

   OK: REPLACE MASS AIR FLOW METER 

   Fig 5: Identifying Mass Air Flow Meter Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go To Next Step 

6. READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN ECM) 
   1. Disconnect the E4 ECM connector.
      Fig 6: Identifying Mass Air Flow Meter Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the power switch ON (IG).
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
   4. Read the value.

      OK: 

      Temperature value: -40°C (-40°F) 

   5. Reconnect the mass air flow meter connector.

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 7: Identifying ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM