Code No. P0427: No. 2 Exhaust Gas Temperature Sensor (Catalyst Temperature) Circuit Low Input




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSTIC PROCEDURE


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



  • Refer to Data List Reference Table .

  1. Item 118: No. 2 exhaust gas temperature sensor (catalyst temperature)

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. Check No. 2 exhaust gas temperature sensor (catalyst temperature) itself.



  • No. 2 exhaust gas temperature sensor (catalyst temperature) connector check.
  • Check No. 2 exhaust gas temperature sensor (catalyst temperature) itself (Refer to GROUP 17 - Emission Control <DIESEL> - Diesel Particulate Filter (DPF) System - No. 2 Exhaust Gas Temperature Sensor (catalyst temperature) Check ).

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or replace the No. 2 exhaust gas temperature sensor (catalyst temperature). After replacing the No. 2 exhaust gas temperature sensor (catalyst temperature), carry out the forcible DPF regeneration. (Refer to GROUP 17 - Emission Control <DIESEL> - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).

STEP 3. Check harness between No. 2 exhaust gas temperature sensor (catalyst temperature) connector terminal and engine-ECU connector terminal DTS2.



  • Check output line for short circuit.

Q. Is the check result normal?

Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. M.U.T.-III data list



  • Refer to Data List Reference Table

  1. Item 118: No. 2 exhaust gas temperature sensor (catalyst temperature)

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.