CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
GO TO 4.
Repair open circuit or short to ground or short to power in harness or connectors.
CHECK HEATED OXYGEN SENSOR 1 HEATER
Check resistance between HO2S1 terminals as follows.
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
OK or NG
GO TO 5.
Replace malfunctioning heated oxygen sensor.
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure (Cont’d)