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Diagnosis Procedure
1.PERFORM AIR FUEL RATIO INITIAL LEARNING
  1. Start engine and warm it up to the normal operating temperature.
  2. Clear the air fuel ratio initial learning. Refer to Work Procedure.
  3. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected? Is it difficult to start engine?
Perform trouble diagnosis for DTC P0171. Refer to DTC Diagnosis Procedure.
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2.CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
  4. Check the continuity between HO2S2 harness connector and ECM harness connector.
    HO2S2ECMContinuity
    ConnectorTerminalConnectorTerminal
    E354F5297Existed
  5. Also check harness for short to ground and short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
3.CHECK HO2S2 INPUT SIGNAL CIRCUIT
  1. Check the continuity between HO2S2 harness connector and ECM harness connector.
    HO2S2ECMContinuity
    ConnectorTerminalConnectorTerminal
    E353F5292Existed
  2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
    HO2S2—Continuity
    ConnectorTerminal
    E353GroundNot existed
    ECM—Continuity
    ConnectorTerminal
    F5292GroundNot existed
  3. Also check harness for short to ground and short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
4.CHECK HEATED OXYGEN SENSOR 2
Refer to Component Inspection.
Is the inspection result normal?
INSPECTION END
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5.REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View.
: INSPECTION END