Exhaust Gas/Outside Odor Detecting Sensor

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. Scan Tool Testing and Procedures, see Nos. 1 to 2.
28, -28, 29 or -29 is displayed.
YES - Go to Diagnosis Procedure. SEE 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. Exhaust Gas/Outside Odor Detecting Sensor Sensitivity Adjustment Function.
Are the symptoms solved?
YES - INSPECTION END
NO - GO TO 2.
2.CHECK EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR POWER SUPPLY
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 - Repair harness or connector between exhaust gas/outside odor detecting sensor and fuse.
3.CHECK EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR GROUND CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect 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 - GO TO 4.
NO - Repair harness or connector.
4.CHECK EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR SIGNAL CIRCUIT
1. Reconnect unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage between exhaust gas/outside odor detecting sensor harness connector and ground using an oscilloscope.





Is the inspection result normal?
YES - Replace exhaust gas/outside odor detecting sensor. Removal And Installation.
NO - GO TO 5.
5.CHECK EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect 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 - GO TO 6.
NO - Repair harness or connector.
6.CHECK EXHAUST GAS/OUTSIDE ODOR DETECTING SENSOR SIGNAL CIRCUIT FOR SHORT
Check continuity between exhaust gas/outside odor detecting sensor harness connector and ground.





Is the inspection result normal?
YES - Replace unified meter and A/C amp. Removal and Installation.
NO - Repair harness or connector.