Inspection Procedure

1. Remove the LH-IG fuse from the cowl side junction block LH.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Item	Condition	Specified Condition
   LH-IG fuse	Always	Below 1 Ω

   Fig 1: Identifying LH-IG Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE (LH-IG) 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor.
5. Select the item below in the Data List, and read the display on the Techstream.

   Data List / Air Conditioner 

   DATA LIST / AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Emission Gas Nox Sensor (Nox Gas Sens)	Emission gas NOx sensor / Min 0, Max 255	Smog ventilation sensor value increases as gas amount increases	-

   OK: The display is as specified in the normal condition column. 

   Result 

   RESULT DESCRIPTION
   
   

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the Problem Symptoms Table)	B
   OK (When troubleshooting according to the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

C: REPLACE A/C AMPLIFIER  (See REMOVAL  )

A: Go to next step 

1. Disconnect the smog ventilation sensor connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   B11-6 (E) - Body ground	Always	Below 1 Ω

Fig 2: Identifying B11 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Standard Voltage 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   B11-3 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   	Engine switch off	Below 1 V

Fig 3: Identifying B11 Connector Terminal (IG)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the smog ventilation sensor
2. Connect a battery positive (+) lead to terminal 3 (IG) and a negative (-) lead to terminal 6 (E)
3. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 4 (DGS1).

   OK: When the sensor is exposed to the exhaust gas, the resistance increases. 

   HINT

   The resistance before blowing exhaust gas is 10 kΩ to 40 kΩ

Fig 4: Identifying Smog Ventilation Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SMOG VENTILATION SENSOR  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the A/C amplifier connector
   Fig 5: Identifying J58 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   B11-1 (SG) - J58-39 (SG-6)	Always	Below 1 Ω
   B11-4 (DGS1) - J58-33 (DGS1)	Always	Below 1 Ω
   J58-39 (SG-6) - Body ground	Always	10 kΩ or higher
   J58-33 (DGS1) - Body ground	Always	10 kΩ or higher

Fig 6: Identifying B11 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE A/C AMPLIFIER  (See REMOVAL  )