Diagnostic Trouble Code

WIRING DIAGRAM

CIRCUIT DESCRIPTION
ECM monitors oxygen concentration in the exhaust gas which has passed the three way catalytic converter by HO2S-2. When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen concentration) is slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas which has been stored in the catalyst.





REFERENCE





DETECTING CONDITION AND POSSIBLE CAUSE





DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester, on a level road.

1. Turn ignition switch OFF. Clear DTC with ignition switch ON, check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: 1/4 or more
- Altitude (barometric pressure): 2400m, 8000ft or less (560mmHg, 75kPa or more)
- Ambient temp.: -10°C, 14°F or higher
- Intake air temp.: 5O°C, 122°F or lower
2. Start engine and drive vehicle at 35 - 45mph, 55 - 65km/h in 3rd gear (M/T or A/T) for 8min. or longer. While this driving, if "Catalyst Monitoring TEST COMPLETED" is displayed in "READINESS TESTS" mode and DTC is not displayed in "DTC" mode, confirmation test is completed. If "TEST NOT COMPLTD" is still being displayed, continue test driving.
3. Decrease vehicle speed at 30 - 40mph, 50 - 60km/h in 3rd gear (M/T or A/T) and hold throttle valve at that opening position for 2 min.
4. Stop vehicle (do not turn ignition switch OFF) and confirm test results according to "Test Result Confirmation Flow Chart".





INSPECTION