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 Techstream. 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.

READ VALUE OF TECHSTREAM (INTAKE AIR TEMPERATURE)

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

Read the values.

Standard:

Same value as actual Intake Air Temperature (IAT).

Result

RESULT REFERENCE

Intake Air Temperature	Proceed to
-40°C (-40°F)	A
140°C (284°F) or more	B
OK (same as present temperature)	C

HINT:

If there is an open circuit, the tester indicates -40°C (-40°F).
If there is a short circuit, the tester indicates 140°C (284°F) or more.

B: Go to step 4

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to next step

READ VALUE OF TECHSTREAM (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 Techstream to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Intake Air.
6. Read the value.
  Standard:
  
  140°C (284°F) or more
7. Reconnect the MAF meter connector.
OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER

Fig 1: Reading Value Of Techstream (Check For Open In Wire Harness)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step
READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN ECM)
1. Disconnect the M1 MAF 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. Connect the Techstream to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Intake Air.
6. Read the value.
  Standard:
  
  140°C (284°F) or more
7. Reconnect the MAF meter connector.
NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

Fig 2: Reading Value Of Techstream (Check For Open In ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
READ VALUE OF TECHSTREAM (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 ON and turn the tester ON.
4. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Intake Air.
5. Read the value.
  Standard:
  
  -40°C (-40°F)
6. Reconnect the MAF meter connector.
OK: REPLACE MASS AIR FLOW METER

Fig 3: Reading Value Of Techstream (Check For Open In ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step
READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN ECM)
1. Disconnect the M1 MAF meter connector.
2. Disconnect the E5 ECM connector.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Intake Air.
6. Read the value.
  Standard:
  
  -40°C (-40°F)
7. Reconnect the ECM connector.
8. Reconnect the MAF meter connector.
NG: REPLACE ECM

Fig 4: Reading Value Of Techstream (Check For Short In ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR