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Diagnosis Procedure
1.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
  1. Turn ignition switch OFF.
  2. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between A/F sensor 1 harness connector and ground.
    +−Voltage
    A/F sensor 1
    Connector Terminal
    F184GroundBattery voltage
Is the inspection result normal?
.
.
 
2.CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
    A/F sensor 1IPDM E/RContinuity
    Connector TerminalConnector Terminal
    F184F3575Existed
Is the inspection result normal?
Perform the trouble diagnosis for power supply circuit.
Repair or replace malfunctioning part.
 
3.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.
    A/F sensor 1ECMContinuity
    Connector TerminalConnector Terminal
    F183F516Existed
  4. Also check harness for short to ground and short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
4.CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection.
Is the inspection result normal?
INSPECTION END
.
 
5.REPLACE A/F SENSOR 1
Replace A/F sensor 1. Refer to Removal and Installation.
caution
  • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
  • Before installing new A/F sensor, clean exhaust system threads.
: INSPECTION END