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Diagnosis Procedure
1.CHECK AIR FUEL RATIO 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
    ConnectorTerminal
    F184GroundBattery voltage
Is the inspection result normal?
.
.
 
2.CHECK AIR FUEL RATIO 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
    ConnectorTerminalConnectorTerminal
    F184F3575Existed
  4. Also check harness for short to ground and short to power.
Is the inspection result normal?
Perform trouble diagnosis for power supply circuit.
Repair or replace malfunctioning part.
 
3.CHECK A/F SENSOR 1 INPUT 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
    ConnectorTerminalConnectorTerminal
    F181F5156Existed
    260
  4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
    A/F sensor 1—Continuity
    ConnectorTerminal
    F181GroundNot existed
    2
    ECM—Continuity
    ConnectorTerminal
    F5156GroundNot existed
    60
  5. Also check harness for short to ground and short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
4.REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to Exploded View.
: INSPECTION END