DTC B1461-11: Emission Gas Sensor (NOx) Circuit Short to Ground [08/2023 - ]: Procedure

1. Read the Data List according to the display on the GTS.

   Body Electrical > Air Conditioner > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Emission Gas NOx Sensor	Displays the exhaust gas (NOx) detection status of the smog ventilation sensor	0 to 5 V	Increases when the concentration of exhaust gas (NOx) around the smog ventilation sensor increases	Smog ventilation sensor circuit malfunction

   Body Electrical > Air Conditioner > Data List 

   Tester Display
   Emission Gas NOx Sensor

   OK

   The value of the Data List item increases when the concentration of exhaust gas (NOx) increases.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  2

Pre-procedure1

• Disconnect the A66 smog ventilation sensor connector.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A66-5 (E) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the A66 smog ventilation sensor connector.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A66-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the A66 smog ventilation sensor connector.
• Disconnect the C48 and C50 air conditioning amplifier assembly connector.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A66-2 (DGS1) - C50-7 (DGS1)	Always	Below 1 Ω	Ω
  A66-4 (SG) - C48-14 (SG-2)	Always	Below 1 Ω	Ω
  A66-2 (DGS1) or C50-7 (DGS1) - Body ground	Always	10 kΩ or higher	kΩ
  A66-4 (SG) or C48-14 (SG-2) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

Refer to INSPECTION [10/2022 - ]

Result

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPLACE SMOG VENTILATION SENSOR. Refer to  REMOVAL [10/2022 - ]