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DTC Diagnosis Procedure
1.DTC PRIORITY
If DTC P0139 is detected with DTC P0137 or P0138 perform trouble diagnosis for DTC P0137 or P0138 .
Is applicable DTC detected?
Perform diagnosis of applicable.
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2.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
  1. Clear the mixture ratio self-learning value. Refer to DescriptionDescription.
  2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?
Perform trouble diagnosis for DTC P0171 or P0172. DTC Description or DTC Description
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3.CHECK HO2S2 GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect heated oxygen sensor 2 harness connector.
  3. Disconnect ECM harness connector.
  4. Check the continuity between HO2S2 harness connector and ECM harness connector.
    +−Continuity
    HO2S2ECM
    ConnectorTerminalConnectorTerminal
    E354F5297Existed
  5. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT
  1. Check the continuity between HO2S2 harness connector and ECM harness connector.
    +−Continuity
    HO2S2ECM
    ConnectorTerminalConnectorTerminal
    E353F5292Existed
  2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
    +−Continuity
    HO2S2
    ConnectorTerminal
    E353GroundNot existed
    +−Continuity
    ECM
    ConnectorTerminal
    F5292GroundNot existed
  3. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
5.CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to Component Inspection.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
.
 
6.REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View.
: INSPECTION END