Code No. P0073: No. 2 Intake Air Temperature Sensor Circuit High Input <Euro3, Euro4>










OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criterion

PROBABLE CAUSES




DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III data list



  • Item 8: No. 2 intake air temperature sensor
OK: At ambient temperature (atmospheric temperature) or equivalent.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2 .

STEP 2. Connector check: B-128 No. 2 intake air temperature sensor connector


Q. Is the check result normal?

Go to Step 3 .
Repair or replace the connector.

STEP 3. Check No. 2 intake air temperature sensor itself.



  • Check No. 2 intake air temperature sensor itself (Refer to ).

Q. Is the check result normal?

Go to Step 4 .
Replace the No. 2 intake air temperature sensor.

STEP 4. Perform voltage measurement at B-128 No. 2 intake air temperature sensor connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
OK: 4.5 - 4.9 V

Q. Is the check result normal?

Go to Step 8 .
Go to Step 5 .

STEP 5. Connector check: D-213 engine-ECU connector.


Q. Is the check result normal?

Go to Step 6 .
Repair or replace the connector.

STEP 6. Check harness between B-128 (terminal No. 1) No. 2 intake air temperature sensor connector and D-213 (terminal No. 38) engine-ECU connector.



  • Check output line for open circuit.

Q. Is the check result normal?

Go to Step 7 .
Repair the damaged harness wire.

STEP 7. M.U.T.-III data list



  • Item 8: No. 2 intake air temperature sensor
OK: At ambient temperature (atmospheric temperature) or equivalent.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 8. Perform resistance measurement at B-128 No. 2 intake air temperature sensor connector.



  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 11 .
Go to Step 9 .

STEP 9. Connector check: D-213 engine-ECU connector


Q. Is the check result normal?

Go to Step 10 .
Repair or replace the connector.

STEP 10. Check harness between B-128 (terminal No. 2) No. 2 intake air temperature sensor connector and D-213 (terminal No. 32) engine-ECU connector.



  • Check earthing line for open circuit.

Q. Is the check result normal?

Go to Step 7 .
Repair the damaged harness wire.

STEP 11. Connector check: D-213 engine-ECU connector.


Q. Is the check result normal?

Go to Step 12 .
Repair or replace the connector.

STEP 12. Check harness between B-128 (terminal No. 1) No. 2 intake air temperature sensor connector and D-213 (terminal No. 38) engine-ECU connector.



  • Check output line for damage.

Q. Is the check result normal?

Go to Step 7 .
Repair the damaged harness wire.