SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P0130/21

DESCRIPTION

The front Heated Oxygen (HO2) sensor monitors the oxygen concentration in the exhaust gas. For optimum three-way catalytic converter operation, the air-fuel mixture must be maintained as close as possible to the stoichiometric ratio. The HO2 sensor output voltage changes dramatically in the vicinity of the stoichiometric ratio. By making adjustments in accordance with these signal voltages, the ECM adjusts the fuel injection time so that the air-fuel ratio remains close to stoichiometric levels.

If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is lean and the HO2 sensor output voltage to the ECM drops below 0.45 V. If the oxygen concentration in the exhaust gas decreases, the air- fuel ratio is rich and the HO2 sensor output voltage to the ECM increases to above 0.45 V.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

• (a) Connect the intelligent tester to the DLC3.

• (b) Change the intelligent tester from the normal mode to the check (test) mode Click here.

• (c) Start the engine and let the engine idle for 100 seconds or more.

• (d) Drive the vehicle at 40 km/h (25 mph) or more for 20 seconds or more.

• (e) Let the engine idle for 20 seconds or more.

• (f) Perform steps (d) to (e) 3 times.

• (g) Let the engine idle for 30 seconds or more.

INSPECTION PROCEDURE

When using intelligent tester:

PROCEDURE

1. CHECK OTHER DTC OUTPUT

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Enter the following menus: Powertrain / Engine and ECT / DTC.

   3. Read the DTCs.

      Result
      DTC Proceed to Only P0130/21 is output A Other DTCs are output besides P0130/21 B

      Tech Tips

      If any other codes besides P0130/21 are output, perform troubleshooting on those codes first.

   
   

   B

   GO TO RELEVANT DTC CHART

   A

2. READ VALUE USING DATA LIST (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Start the engine and turn the intelligent tester ON.

   3. Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S1.

   4. Warm up the heated oxygen sensor at an engine speed of 2,500 rpm for approximately 90 seconds.

   5. Read the output voltage of the heated oxygen sensor during engine idling.

      Standard
      Fluctuates between less than 0.4 V and more than 0.6 V (see the following figure).

      

   
   

   OK

   PERFORM CONFIRMATION DRIVING PATTERN Click here

   NG

3. CHECK PCV HOSE

   OK
   PCV hose is connected correctly, and is not damaged.

   
   

   NG

   CONNECT HOSE SECURELY OR REPLACE PCV HOSE

   OK

4. INSPECT HEATED OXYGEN SENSOR

   

   
   

   1. Disconnect the H9 sensor connector.

   2. Measure the resistance of the sensor.

      Standard resistance
      Tester Connection Condition Specified Condition 1 (HT1A) - 2 (+B) 20°C (68°F) 5 to 10 Ω 1 (HT1A) - 4 (E2) - 10 kΩ or higher

   
   

   NG

   REPLACE HEATED OXYGEN SENSOR

   OK

5. INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY)

   

   
   

   1. Remove the integration relay from the engine room junction block.

   2. Measure the voltage of the MAIN relay.

      Standard voltage
      Tester Connection Condition Specified Condition 1J-5 - Body ground Ignition switch ON 10 to 14 V

   
   

   NG

   REPLACE INTEGRATION NO.1 RELAY

   OK

6. CHECK WIRE HARNESS (HEATED OXYGEN SENSOR - ECM)

   

   
   

   1. Disconnect the H9 heated oxygen sensor connector.

   2. Disconnect the E11 ECM connector.

   3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition H9-1 (HT1A) - E11-1 (HT1A) H9-3 (OX1A) - E11-21 (A1A+) Below 1 Ω H9-1 (HT1A) or E11-1 (HT1A) - Body ground H9-3 (OX1A) or E11-21 (A1A+) - Body ground 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

7. CHECK AIR INDUCTION SYSTEM

   
   

   1. Check the air induction system for vacuum leakage.

      OK
      No leakage from air induction system.

   
   

   NG

   REPAIR OR REPLACE AIR INDUCTION SYSTEM

   OK

8. CHECK FUEL PRESSURE

   
   

   1. Check the fuel pressure Click here.

   
   

   NG

   REPAIR OR REPLACE FUEL SYSTEM

   OK

9. INSPECT FUEL INJECTOR ASSEMBLY

   
   

   1. Check the fuel injector Click here.

   
   

   NG

   REPLACE FUEL INJECTOR ASSEMBLY

   OK

   REPLACE HEATED OXYGEN SENSOR

10. PERFORM CONFIRMATION DRIVING PATTERN

    Tech Tips

    Clear all DTCs prior to performing the confirmation driving pattern.

    
    

    NEXT

11. READ OUTPUT DTC

    
    

    1. Read the DTC using the intelligent tester.

       Result
       DTC Proceed to Only P0130/21 is output A Other DTCs are output besides P0130/21 B

    
    

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

    REPLACE HEATED OXYGEN SENSOR

When not using intelligent tester:

PROCEDURE

1. CHECK OTHER DTC OUTPUT

   Result
   DTC Proceed to Only P0130/21 is output A Other DTCs are output besides P0130/21 B

   Tech Tips

   If any other codes besides P0130/21 are output, perform troubleshooting on those codes first.

   
   

   B

   GO TO RELEVANT DTC CHART

   A

2. CHECK WIRE HARNESS (HEATED OXYGEN SENSOR - ECM)

   

   
   

   1. Disconnect the H9 heated oxygen sensor connector.

   2. Disconnect the E11 ECM connector.

   3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition H9-1 (HT1A) - E11-1 (HT1A) H9-3 (OX1A) - E11-21 (A1A+) Below 1 Ω H9-1 (HT1A) or E11-1 (HT1A) - Body ground H9-3 (OX1A) or E11-21 (A1A+) - Body ground 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

   REPLACE HEATED OXYGEN SENSOR