Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 OUTPUT DTC 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON and turn the intelligent tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   4. Read DTCs.

      Result 

      DTC OUTPUT RESULT REFERENCE
      
      

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

   B: Go to step   6 

   C: Go to step   3 

   A: Go TO NEXT STEP. 

2. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON.
   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 

      DTC OUTPUT 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   5 

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: Go TO NEXT STEP. 

3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the B1 Mass Air Flow (MAF) meter connector.
   2. Connect terminals THA and E2 of the MAF meter wire harness side connector.
      Fig 1: Connecting Terminals THA And E2 Of MAF Meter Wire Harness Side Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch ON.
   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 value: 140°C (284°F) or higher 

   8. Reconnect the MAF meter connector.

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

   NG: Go TO NEXT STEP. 

4. CHECK WIRE HARNESS (MASS AIR FLOW METER - ECM) 
   1. Disconnect the B1 MAF meter connector.
   2. Disconnect the B30 ECM connector.
   3. Measure the resistance.

      Standard resistance 

      CONNECTOR TERMINALS RESISTANCE REFERENCE AND CONDITION
      
      

      Tester Connection	Specified Condition
      B1-1 (THA) - B30-71 (THA)	Below 1 Ω
      B1-2 (E2) - B30-74 (ETHA)	Below 1 Ω

      Fig 2: Identifying B1 MAF & B30 ECM Connector Terminals

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

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 

5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the B1 MAF meter connector.
      Fig 3: Disconnecting B1 MAF meter connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch ON.
   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 value: -40°C (-40°F) 

   7. Reconnect the MAF meter connector.

   OK: REPLACE MASS AIR FLOW METER 

   NG: Go TO NEXT STEP. 

6. CHECK WIRE HARNESS (MASS AIR FLOW METER - ECM) 
   1. Disconnect the B1 MAF meter connector.
   2. Disconnect the B30 ECM connector.
   3. Measure the resistance.

      Standard resistance 

      CONNECTOR TERMINALS RESISTANCE REFERENCE AND CONDITION
      
      

      Tester Connection	Specified Condition
      B1-1 (THA) or B30-71 (THA) - Body ground	10 kΩ or higher

      Fig 4: Identifying B1 MAF Meter & B30 ECM Connector Terminals

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

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE ECM