Inspection Procedure

HINT:

If other DTCs relating to different systems that have terminal E3 as the ground terminal are output simultaneously, terminal E3 may have an open circuit.
Read freeze frame data using 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 (See FREEZE FRAME DATA ).

READ VALUE OF INTAKE AIR TEMPERATURE SENSOR (INTAKE AIR)

Connect Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
Read the value displayed on the tester.

Standard:

Same as actual Intake Air Temperature (IAT).

Result

RESULT CHART

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

B: Go to step 4

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to Next Step

CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)
1. Confirm good connection of the mass air flow meter.
2. Disconnect the E29 Mass Air Flow (MAF) meter connector.
3. Connect terminals THA and E3 of the MAF meter wire harness side connector.
4. Connect Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the tester on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
8. Read the value displayed on the tester.
  Standard:
  
  140°C (284°F) or higher
9. Reconnect the MAF meter connector.
OK: REPLACE MASS AIR FLOW METER

NG: Go to Next Step
CHECK ECM (CHECK FOR OPEN IN ECM)
1. Confirm good connection of the ECM.
2. Disconnect the E29 MAF meter connector.
3. Connect terminals THA and E3 of the E5 ECM connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
4. Connect Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the tester on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
8. Read the value displayed on the tester.
  Standard:
  
  140°C (284°F) or higher
9. Reconnect the MAF meter connector.
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: REPLACE ECM
CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
1. Disconnect the E29 MAF meter connector.
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
6. Read the value displayed on the tester.
  Standard:
  
  -40°C (-40°F) or higher
7. Reconnect the MAF meter connector.
OK: REPLACE MASS AIR FLOW METER

NG: Go to Next Step
CHECK ECM (CHECK FOR SHORT IN ECM)
1. Disconnect the E5 ECM connector.
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
6. Read the value displayed on the tester.
  Standard:
  
  -40°C (-40°F) or higher
7. Reconnect the ECM connector.
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: REPLACE ECM