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DTC Diagnosis Procedure
1.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
  1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between A/F sensor 1 harness connector and ground.
    +−Voltage
    A/F sensor 1
    ConnectorTerminal
    F184GroundBattery voltage
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
2.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
    +−Continuity
    A/F sensor 1ECM
    ConnectorTerminalConnectorTerminal
    F183F516Existed
  4. Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair open circuit, short to ground or short to power in harness or connectors.
 
3.CHECK A/F SENSOR 1 HEATER
Check the A/F sensor 1 heater. Refer to Component Inspection.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
.
 
4.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to Exploded View.
: INSPECTION END