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 or Techstream. 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.

READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (INTAKE AIR TEMPERATURE)

Connect the Intelligent tester or Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the tester ON.
Enter the following menus:
1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR B1 or INTAKE AIR B2.
2. Techstream - Select: Powertrain / Engine / Data List / All Data / Intake Air Bank 1 or Intake Air Bank2.

Read the value displayed on the tester.

Standard: Same as actual Intake Air Temperature (IAT).

Result

INTAKE AIR TEMPERATURE

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

B: Go to step 4

C: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

A: GO TO NEXT STEP

READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the E13 or E22 MAF meter connector.
2. Connect terminals THA and E2 or THA2 and E2R of the MAF meter wire harness side connector.
3. Connect the Intelligent tester or Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the tester ON.
6. Enter the following menus:
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR B1 or INTAKE AIR B2.
  2. Techstream - Select: Powertrain / Engine / Data List / All Data / Intake Air Bank 1 or Intake Air Bank2.
7. Read the value displayed on the tester.
  Standard: 140°C (284°F) or higher
  
  Fig 1: Identifying Connector Terminal Of MAF
  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
READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (CHECK FOR OPEN IN ECM)
1. Disconnect the E13 or E22 MAF meter connector.
2. Connect terminals THA and E2 or THA2 and E2 of the E1 ECM connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
3. Connect the Intelligent tester or Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the tester ON.
6. Enter the following menus:
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR B1 or INTAKE AIR B2.
  2. Techstream - Select: Powertrain / Engine / Data List / All Data / Intake Air Bank 1 or Intake Air Bank2.
7. Read the value displayed on the tester.
  Standard: 140°C (284°F) or higher
  
  Fig 2: Identifying Connector Terminal Of ECM
  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 )
READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E13 or E22 MAF meter connector.
2. Connect the Intelligent tester or Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester ON.
5. Enter the following menus:
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR B1 or INTAKE AIR B2.
  2. Techstream - Select: Powertrain / Engine / Data List / All Data / Intake Air Bank 1 or Intake Air Bank2.
6. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
  
  Fig 3: Checking For Short In Wire Harness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE MASS AIR FLOW METER (See REMOVAL )

NG: GO TO NEXT STEP
READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (CHECK FOR SHORT IN ECM)
1. Disconnect the E13 or E22 MAF meter connector.
2. Disconnect the E1 ECM connector.
3. Connect the Intelligent tester or Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the tester ON.
6. Enter the following menus:
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR B1 or INTAKE AIR B2.
  2. Techstream - Select: Powertrain / Engine / Data List / All Data / Intake Air Bank 1 or Intake Air Bank2.
7. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
  
  Fig 4: Checking For Short In ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: REPLACE ECM (See REMOVAL )