Inspection Procedure

HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is 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.

READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR TEMPERATURE)
1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
2. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool ON.
3. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
4. Read the values.
  Temperature: Same value as the actual intake air temperature.
  
  Result:
  
  Fig 1: Result Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
- If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F).
- If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more.
1. B: Go to step 4
2. C: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS
3. A: GO TO NEXT STEP.
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the M1 mass air flow meter connector.
2. Connect terminals THA and E2 of the mass air flow meter wire harness side connector.
3. Turn the ignition switch to ON.
4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
5. Read the values.
  Temperature value: 140°C (284°F) or more
  
  Fig 2: Temperature Value: 140°C (284°F) Or More Specification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Reconnect the mass air flow meter connector.
  
  Fig 3: Reconnecting Mass Air Flow Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE MASS AIR FLOW SENSOR
2. NG: GO TO NEXT STEP.
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN ECM)
1. Disconnect the M1 mass air flow meter connector.
2. Connect terminals THA and E2 of the E5 ECM connector.
  HINT:
  
  Before checking, do a visual and contact pressure check for the ECM connector.
3. Turn the ignition switch to ON.
4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
5. Read the values.
  Temperature value: 140°C (284°F) or more
  
  Fig 4: Temperature value: 140°C (284°F) Or More Specification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Reconnect the mass air flow meter connector.
  
  Fig 5: Reconnecting Mass Air Flow Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. NG: GO TO NEXT STEP.
  CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See ECM (2UZ-FE) ) .
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the M1 mass air flow meter connector.
2. Turn the ignition switch to ON.
3. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
4. Read the values.
  Temperature value: -40°C (-40°F)
5. Reconnect the mass air flow meter connector.
  
  Fig 6: Reconnecting Mass Air Flow Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: REPLACE MASS AIR FLOW SENSOR
2. NG: GO TO NEXT STEP.
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM)
1. Disconnect the E5 ECM connector.
2. Turn the ignition switch ON.
3. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
4. Read the values.
  Temperature value: -40°C (-40°F)
  
  Fig 7: Temperature value: -40°C (-40°F) Specification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Reconnect the ECM connector.
  
  Fig 8: Reconnecting ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. NG: GO TO NEXT STEP.
  REPLACE ECM (See ECM (2UZ-FE) ) .