Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

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 Techstream. 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 DATA LIST (INTAKE AIR TEMPERATURE)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream ON.
Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.

Read the values displayed on the Techstream.

Standard:

Same value as actual IAT.

Result

RESULT CHART

Temperature Displayed	Proceed to
-40°C (-40°F)	A
140°C (284°F)	B
Same as actual IAT	C

HINT:

If there is an open circuit, the Techstream indicates -40°C (-40°F).
If there is a short circuit, the Techstream indicates 140°C (284°F).
B: Go to step 4

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

A: Go to next step

READ DATA LIST (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the M1 MAF meter connector.
2. Connect terminals THA and E2 of the MAF meter wire harness side connector.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON and turn the Techstream ON.
5. Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.
6. Read the value displayed on the Techstream.
  Standard:
  
  140°C (284°F)
7. Reconnect the MAF meter connector.
  OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER
  
  Fig 1: Checking For Open In Wire Harness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: Go to next step
READ DATA LIST (CHECK FOR OPEN IN ECM)
1. Disconnect the M1 MAF meter connector.
2. Connect terminals THA and E2 of the ECM connector.
  HINT:
  
  Before checking, do a visual and contact pressure check for the ECM connector.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON and turn the Techstream ON.
5. Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.
6. Read the value displayed on the Techstream.
  Standard:
  
  140°C (284°F)
7. Reconnect the MAF meter connector.
  NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (See REMOVAL )
  
  Fig 2: Checking For Open In ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
READ DATA LIST (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the M1 MAF meter connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON and turn the Techstream ON.
4. Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.
5. Read the value displayed on the Techstream.
  Standard:
  
  -40°C (-40°F)
6. Reconnect the MAF meter connector.
  
  Fig 3: Checking For Short In Wire Harness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: REPLACE MASS AIR FLOW METER
  
  NG: Go to next step
READ DATA LIST (CHECK FOR SHORT IN ECM)
1. Disconnect the E4 and E5 ECM connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON and turn the Techstream ON.
4. Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.
5. Read the value displayed on the Techstream.
  Standard:
  
  -40°C (-40°F)
6. Reconnect the ECM connectors.
  NG: REPLACE ECM (See REMOVAL )
  
  Fig 4: Checking For Short In ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: REPAIR OR REPLACE HARNESS OR CONNECTOR