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SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P003612, P003613, P005612, P005613, P102A9E, P105A9E

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DTC Code DTC Name
P003612 HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery
P003613 A/F (O2) Heater Control Circuit Bank 1 Sensor 2 Circuit Open
P005612 HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Battery
P005613 A/F (O2) Heater Control Circuit Bank 2 Sensor 2 Circuit Open
P102A9E O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On
P105A9E O2 Sensor Heater Performance Bank 2 Sensor 2 Stuck On
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DESCRIPTION

The air fuel ratio sensor (sensor 2) generates current that corresponds to the actual air fuel ratio. This sensor current is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor (sensor 2) is a cup type sensor and uses a zirconia element for the sensor element. The zirconium element is made of platinum coated zirconium and includes an integrated heating element. The inner surface of the zirconia element is exposed to the outside air and the outer surface of it is exposed to the exhaust gas. The zirconia element generates a voltage according to the oxygen concentration of the exhaust gas and outside air. The air fuel ratio sensor (sensor 2) becomes very efficient when heated. When the exhaust gas temperature is low, the sensor does not generate useful voltage signals without supplementary heating. Therefore, the air fuel ratio sensor (sensor 2) includes a heater to heat the zirconia element.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel ratio.

Tip:

  • When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor (sensor 2) heater in fail-safe mode. Fail-safe mode continues until the power switch is turned off.

  • Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

  • B004SD8E13

    The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor (sensor 2) heater circuit uses a relay on the +B side of the circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P003612 HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery Air fuel ratio sensor (bank 1 sensor 2) heater current reaches high limit (1 trip detection logic).

  • Short in air fuel ratio sensor (bank 1 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 1 sensor 2)

  • ECM

 Comes on DTC stored SAE: P0038
P003613 A/F (O2) Heater Control Circuit Bank 1 Sensor 2 Circuit Open Air fuel ratio sensor (bank 1 sensor 2) heater current is the specified value or less while the heater is operating (1 trip detection logic).

  • Open in air fuel ratio sensor (bank 1 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 1 sensor 2)

  • A/F HTR relay

  • ECM

 Comes on DTC stored SAE: P0037
P005612 HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Battery Air fuel ratio sensor (bank 2 sensor 2) heater current reaches high limit (1 trip detection logic).

  • Short in air fuel ratio sensor (bank 2 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 2 sensor 2)

  • ECM

 Comes on DTC stored SAE: P0058
P005613 A/F (O2) Heater Control Circuit Bank 2 Sensor 2 Circuit Open Air fuel ratio sensor (bank 2 sensor 2) heater current is the specified value or less while the heater is operating (1 trip detection logic).

  • Open in air fuel ratio sensor (bank 2 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 2 sensor 2)

  • A/F HTR relay

  • ECM

 Comes on DTC stored SAE: P0057
P102A9E O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On Air fuel ratio sensor (bank 1 sensor 2) heater terminal voltage level is low while the heater is not operating (1 trip detection logic).

  • Short in air fuel ratio sensor (bank 1 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 1 sensor 2)

  • ECM

 Comes on DTC stored SAE: P102D
P105A9E O2 Sensor Heater Performance Bank 2 Sensor 2 Stuck On Air fuel ratio sensor (bank 2 sensor 2) heater terminal voltage level is low while the heater is not operating (1 trip detection logic).

  • Short in air fuel ratio sensor (bank 2 sensor 2) heater circuit

  • Air fuel ratio sensor (bank 2 sensor 2)

  • ECM

 Comes on DTC stored SAE: P105D
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MONITOR DESCRIPTION

The air fuel ratio sensor (sensor 2) detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum-coated zirconia and includes an integrated heating element.

The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.

The air fuel ratio sensor (sensor 2) is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful current signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor (sensor 2) becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.



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MONITOR STRATEGY

Frequency of Operation Continuous
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TYPICAL ENABLING CONDITIONS

Table 1. P0037 and P0057
Time after heater on 5 seconds or more
Table 2. P0038 and P0058
Time after heater on 5 seconds or more
Table 3. P102D and P105D
Heater output duty cycle Less than 75%
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the GTS on [A].

  6. Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).

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  7. Start the engine and idle it for 5 minutes or more [B].

  8. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 rpm for 1 minute [C].

    Tip:

    During charge control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform steps [C] and [D] after charge control has completed.

  9. Idle the engine for 5 minutes or more [D].

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [E].

  11. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  13. Input the DTC: P003612, P003613, P005612, P005613, P102A9E or P105A9E.

  14. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE, perform steps [B] through [E] again.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

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    (Select Powertrain in Health Check and then check the time stamp data.)

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  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

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Tip:

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

  • Refer to "Data List / Active Test" [A/F Sensor Heater Current Value B1S2, A/F Sensor Heater Current Value B2S2, A/F Sensor Heater Duty B1S2 and A/F Sensor Heater Duty B2S2].

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  • When the values for the Data List item A/F Sensor Heater Current Value B1S2 and A/F Sensor Heater Current Value B2S2 are not 0 A, the heaters are on.

  • Change the fuel injection volume using the Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the air fuel ratio sensor (sensor 2) output value (Click here). If the sensor output value does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    INSPECT AIR FUEL RATIO SENSOR (SENSOR 2) (HEATER RESISTANCE)


    1. Inspect the air fuel ratio sensor (sensor 2).

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      Tip:

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

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      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 2))


    1. Disconnect the air fuel ratio sensor (sensor 2) connector.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D16-2 (+B) - Body ground Power switch on (IG) 11 to 14 V
      D17-2 (+B) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 2) - ECM)


    1. Disconnect the air fuel ratio sensor (sensor 2) connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D16-1 (HA1B) - D1-50 (HA1B) Always Below 1 Ω
      D17-1 (HA2B) - D1-16 (HA2B) Always Below 1 Ω
      D16-1 (HA1B) or D1-50 (HA1B) - Body ground and other terminals Always 10 kΩ or higher
      D17-1 (HA2B) or D1-16 (HA2B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

  5. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003613, P005612, P005613, P102A9E OR P105A9E)


    1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the pending DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTCs are not output A
      DTC P003612, P003613, P005612, P005613, P102A9E or P105A9E is output B

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    CHECK HARNESS AND CONNECTOR (A/F HTR RELAY - AIR FUEL RATIO SENSOR (SENSOR 2))


    1. Remove the A/F HTR relay from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the air fuel ratio sensor (sensor 2) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (A/F HTR relay) - D16-2 (+B) Always Below 1 Ω
      3 (A/F HTR relay) - D17-2 (+B) Always Below 1 Ω
      3 (A/F HTR relay) or D16-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      3 (A/F HTR relay) or D17-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    INSPECT A/F HTR RELAY


    1. Inspect the A/F HTR relay.

      Click here

      Result
      Proceed to
      OK
      NG

  8. Click here

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF A/F HTR RELAY)


    1. B004WIWC01
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 A/F HTR Relay

      Remove the A/F HTR relay from the No. 1 engine room relay block and junction block assembly.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (A/F HTR relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F HTR RELAY - AUXILIARY BATTERY)

  9. Click here

    CHECK HARNESS AND CONNECTOR (A/F HTR RELAY - BODY GROUND)


    1. Remove the A/F HTR relay from the No. 1 engine room relay block and junction block assembly.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (A/F HTR relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F HTR RELAY - EFI-MAIN NO. 1 RELAY)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR