Climate Control Exhaust Gas Sensor: Testing and Inspection

EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR

Description


COMPONENT DESCRIPTION






The exhaust gas/outside odor detecting sensor (1) is attached on the radiator core support. It detects smell of exhaust gas and unpleasant odor, and converts it into a duty ratio which is then input into the unified meter and A/C amp.

STRUCTURE AND OPERATION

Exhaust gas/outside odor detecting sensor detects ambient atmospheric CO, NO2 and unpleasant odor, and converts them to values of resistance. The values are converted to signals with the exhaust gas/outside odor detecting sensor internal circuit, then the unified meter and A/C amp. inputs the signals.
Exhaust gas/outside odor detecting sensor has a construction that detects CO, NO2 and unpleasant odor by exhaust gas/outside odor detecting sensor element from the air intake of the case through a filter (waterproof sheet). It sends output signals to the unified meter and A/C amp. in response to a resistance value conversion by exhaust gas/outside odor detecting sensor elements. Unified meter and A/C amp. prevent a smell of exhaust gas and ambient atmospheric unpleasant odor from getting into vehicle by performing corrections according to various driving conditions.


Component Function Check


1. PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Refer to "Diagnosis Description" Diagnosis Description, see Nos. 1 to 2.
28, 28, 29 or 29 is displayed.
YES- Go to Diagnosis Procedure. Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. ADJUST EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR SENSITIVITY

1.Turn ignition switch ON.
2.Adjust the exhaust gas / outside odor detecting sensor sensitivity. Refer to "Exhaust Gas/Outside Odor Detecting Sensor Sensitivity Adjustment Function (With ACCS)" Adjustments.
Are the symptoms solved?
YES- INSPECTION END
NO- GO TO 2.

2. CHECK POWER SUPPLY FOR EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR

1.Turn ignition switch OFF.
2.Disconnect exhaust gas / outside odor detecting sensor connector.
3.Turn ignition switch ON.
4.Check voltage between exhaust gas / outside odor detecting sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO-Check power supply circuit and 10A fuse (No. 3, located in the fuse block). Refer to "Fuse, Connector and Terminal Arrangement" Fuse Block - Junction Box (J/B).
- If fuse is OK, check harness for open circuit. Repair or replace if necessary.
- If fuse is NG, check harness for short circuit and replace fuse.

3. CHECK GROUND CIRCUIT FOR EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR

1.Turn ignition switch OFF.
2.Check continuity between exhaust gas / outside odor detecting sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR SIGNAL

1.Reconnect exhaust gas / outside odor detecting sensor connector.
2.Turn ignition switch ON.
3.Check signal between exhaust gas / outside odor detecting sensor harness connector and ground using an oscilloscope.





NOTE:
The signal is different by measurement environment of a vehicle.
Is the inspection result normal?
YES- GO TO 5.
NO- Replace exhaust gas / outside odor detecting sensor. Refer to "Removal and Installation" Removal and Installation.

5. CHECK CIRCUIT CONTINUITY BETWEEN UNIFIED METER AND A/C AMP. AND EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR
1.Turn ignition switch OFF.
2.Disconnect exhaust gas / outside odor detecting sensor connector and unified meter and A/C amp. connector.
3.Check continuity between exhaust gas / outside odor detecting sensor harness connector and unified meter and A/C amp. harness connector.





Is the inspection result normal?
YES- Replace unified meter and A/C amp. Refer to "Removal and Installation" Removal and Installation.
NO- Repair harnesses or connectors.