Inspection Procedure

HINT:

• If other DTCs relating 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 the intelligent tester. 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 VALUE OF INTELLIGENT TESTER (INTAKE AIR TEMPERATURE) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the tester on.
   4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   5. Read the value displayed on the tester.

      Standard: 

      Same as actual Intake Air Temperature (IAT). 

      Result 

      RESULT REFERENCE
      
      

      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, the intelligent tester indicates -40°C (-40°F).
      • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.

   B:  Go to step  4

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: Go to next step 

2. READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the M1 Mass Air Flow (MAF) meter connector.
   2. Connect terminals THA and E2 of the MAF meter wire harness side connector.
   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch to the ON position.
   5. Turn the tester on.
   6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   7. Read the value displayed on the tester.

      Standard: 

      140°C (284°F) or higher 

   8. Reconnect the MAF meter connector.
   Fig 1: Identifying M1 Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER (See  REMOVAL  ) 

   NG: Go to next step 

3. READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect terminals THA and E2 of the E8 ECM connector.

      HINT:

      Before checking, do visual and contact pressure checks on the ECM connector.

   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch to the ON position.
   5. Turn the tester on.
   6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   7. Read the value displayed on the tester.

      Standard: 

      140°C (284°F) or higher 

   8. Reconnect the MAF meter connector.
   Fig 2: Identifying Terminals THA And E2 Of E8 ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (See  REMOVAL  ) 

4. READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch to the ON position.
   4. Turn the tester on.
   5. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   6. Read the value displayed on the tester.

      Standard: 

      -40°C (-40°F) 

   7. Reconnect the MAF meter connector.
      Fig 3: Identifying MAF Meter Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER (See  REMOVAL  ) 

   NG: Go to next step 

5. READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN ECM) 
   1. Disconnect the E8 ECM connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch to the ON position.
   4. Turn the tester on.
   5. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   6. Read the value displayed on the tester.

      Standard: 

      -40°C (-40°F) 

   7. Reconnect the ECM connector.
   Fig 4: Disconnecting E8 ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   NG: REPLACE ECM (See  REMOVAL  )