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. Diagnosis Description Unified Meter & A/C Amp., 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. Inlet Port Memory Function Adjustments, "Exhaust Gas/Outside
Odor Detecting Sensor Sensitivity Adjustment Function (With ACCS)".
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). Fuse Block - Junction Box (J/B), "Fuse, Connector and Terminal Arrangement".
- 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. 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. Removal And Installation.
NO - Repair harnesses or connectors.