B1418

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1418/18: Exhaust Gas Sensor Circuit
B1418/18 - Exhaust Gas Sensor Circuit

DESCRIPTION

The smog ventilation sensor, which is installed on the front of the cooler condenser assembly, automatically changes to fresh, fresh/recirculation or recirculation mode operation. The smog ventilation sensor detects CO and HC in the emission gas and transmits signals to the air conditioning amplifier assembly.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (A/C IG)

(a) Remove the A/C IG fuse from the cowl side junction block LH.

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

Standard Resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (SMOG VENTILATION SENSOR)

(a) Use the Data List to check if the smog ventilation sensor is functioning properly.

Air Conditioner





OK:

The display is as specified in the normal condition.

NG -- CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND)

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

3. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND)





(a) Disconnect the A45 smog ventilation sensor connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY)





(a) Disconnect the A45 smog ventilation sensor connector.

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. INSPECT SMOG VENTILATION SENSOR





(a) Remove the smog ventilation sensor Removal.

(b) After applying battery voltage to terminals 3 (IG) and 6 (E) for more than 30 seconds, measure the resistance according to the value(s) in the table below.

Standard Resistance:





HINT
When the sensor is exposed to the exhaust gas, the resistance decreases.

NG -- REPLACE SMOG VENTILATION SENSOR Removal
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - AIR CONDITIONING AMPLIFIER)





(a) Disconnect the A45 smog ventilation sensor connector.

(b) Disconnect the E35 amplifier connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal