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DTC Diagnosis Procedure
1.CHECK HARNESS CONNECTOR
  1. Turn ignition switch OFF.
  2. Disconnect A/F sensor 1 harness connector.
  3. Check harness connector for water.
    Water should not exit.
Is the inspection result normal?
.
Repair or replace harness connector.
 
2.RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to Exploded View, Exploded View.
: .
 
3.CHECK FOR EXHAUST GAS LEAK
  1. Start engine and run it at idle.
  2. Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas leak detected?
Repair or replace malfunctioning parts.
.
 
4.CHECK FOR INTAKE AIR LEAK
  1. Reconnect A/F sensor 1 harness connector.
  2. Start engine and run it at idle.
  3. Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
Repair or replace malfunctioning parts.
.
 
5.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
  1. Clear the mixture ratio self-learning value. Refer to Work Procedure.
  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. Refer to DTC Description or DTC Description.
.
 
6.CHECK A/F SENSOR 1 POWER SUPPLY
  1. Turn ignition switch OFF.
  2. Disconnect 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?
.
.
 
7.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 .
    +−Continuity
    A/F sensor 1IPDM E/R
    ConnectorTerminalConnectorTerminal
    F184F3575Existed
  4. Also check harness for short to ground.
Is the inspection result normal?
Perform the trouble diagnosis for power supply circuit.
Repair or replace error-detected parts.
 
8.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 .
    +−Continuity
    A/F sensor 1ECM
    ConnectorTerminalConnectorTerminal
    F181F5156Existed
    260
  4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
    +-Continuity
    A/F sensor 1
    ConnectorTerminal
    F181GroundNot existed
    2
    +-Continuity
    ECM
    ConnectorTerminal
    F5156GroundNot existed
    60
  5. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
9.CHECK A/F SENSOR 1 HEATER
Check the A/F sensor 1 heater. Refer to Component Inspection.
Is the inspection result normal?
.
.
 
10.CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to Component Inspection.
Is the inspection result normal?
.
Replace heated oxygen sensor 2. Refer to Exploded View.
 
11.CHECK INTERMITTENT INCIDENT
Refer to Intermittent IncidentIntermittent Incident.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
12.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. Refer to Exploded View.
Do you have M.U.T.-III SE?
.
.
 
13.CONFIRM A/F ADJUSTMENT DATA
With M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Select “A/F ADJ-B1” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
  3. Make sure that “0.000” is displayed on M.U.T.-III SE screen.
Is “0.000” displayed?
INSPECTION END
.
 
14.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Clear the mixture ratio self-learning value. Refer to Work Procedure.
Do you have M.U.T.-III SE?
.
INSPECTION END
 
15.CONFIRM A/F ADJUSTMENT DATA
With M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Select “A/F ADJ-B1” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
  3. Make sure that “0.000” is displayed on M.U.T.-III SE screen.
: INSPECTION END