Toyota Yaris: Sfi System / HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)

DESCRIPTION

The air fuel ratio sensor (sensor 1) 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 level, and regulates the fuel injection duration. If the air fuel ratio sensor (sensor 1) malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor (sensor 1) is a planar type sensor and integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are a narrow type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, and thereby sensor activation is accelerated.

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 level.

HINT:

  • When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor (sensor 1) heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
  • Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor (sensor 1).
  • The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor (sensor 1) heater circuit uses a relay on the +B side of the circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P003012

HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery

The air fuel ratio sensor (sensor 1) heater current is more than the specified value while the heater is operating (1 trip detection logic).

  • Short in air fuel ratio sensor (sensor 1) heater circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

SAE: P0032

P003013

HO2S Heater Control Bank 1 Sensor 1 Circuit Open

The air fuel ratio sensor (sensor 1) heater current is less than the specified value while the heater is operating (1 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) heater circuit
  • Air fuel ratio sensor (sensor 1)
  • EFI-MAIN NO. 3 relay
  • ECM

Comes on

SAE: P0031

P101A9E

A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On

The air fuel ratio sensor (sensor 1) heater voltage level is low while the heater is not operating (1 trip detection logic).

  • Short in air fuel ratio sensor (sensor 1) heater circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

SAE: P101D

MONITOR DESCRIPTION

The ECM uses information from the air fuel ratio sensor (sensor 1) to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases.

The air fuel ratio sensor (sensor 1) 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 1) 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 1) becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.

When the current in the air fuel ratio sensor (sensor 1) heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

TYPICAL ENABLING CONDITIONS

P0031

Output duty cycle

7% or higher

P0032

Output duty cycle

7% or higher

P101D

Output duty cycle

Less than 75%

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the GTS on.
  8. Start the engine and idle it for 5 minutes or more [B].
  9. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
  10. Idle the engine for 5 minutes or more [D].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P003012, P003013 or P101A9E.
  15. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [B] through [E] again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

  • Refer to "Data List / Active Test" [A/F (O2) Sensor Heater Duty Ratio B1S1].

    Click here

  • 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 1) output current (Click here ). If the sensor output current 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.
  • Sensor 1 refers to the sensor closest to the engine assembly.
  • Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1.

INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE)

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click here

NG

REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)

OK

2.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 1))

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

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D102-2(+B) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Air Fuel Ratio Sensor (Sensor 1))

NG

GO TO STEP 6

OK

3.

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 1) - ECM)

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

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D102-1(HA1A) - D104-2(HA1A)

Always

Below 1 Ω

D102-1(HA1A) or D104-2(HA1A) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(b) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

5.

CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013 OR P101A9E)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P003012, P003013 or P101A9E is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE ECM

6.

INSPECT EFI-MAIN NO.3 RELAY

Click here

NG

REPLACE EFI-MAIN NO.3 RELAY

OK

7.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO.3 RELAY)

(a) Remove the EFI-MAIN NO.3 relay from the No. 1 engine room relay block assembly.

*1

No. 1 Engine Room Relay Block Assembly

*2

EFI-MAIN NO.3 Relay

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3(EFI-MAIN NO.3 relay) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO.3 RELAY)

OK

8.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO.3 RELAY - BODY GROUND)

(a) Remove the EFI-MAIN NO.3 relay from the No. 1 engine room relay block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1(EFI-MAIN NO.3 relay) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO.3 RELAY - AIR FUEL RATIO SENSOR (SENSOR 1))

(a) Remove the EFI-MAIN NO.3 relay from the No. 1 engine room relay block assembly.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5(EFI-MAIN NO.3 relay) - D102-2(+B)

Always

Below 1 Ω

5(EFI-MAIN NO.3 relay) or D102-2(+B) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO.3 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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