DTC P0031, P0032, P101D; Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) [08/2014 - ]: Procedure

1. Inspect the air fuel ratio sensor.

   Refer to INSPECTION [12/2012 - ]

   HINT: 

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

   Refer to INITIALIZATION [12/2012 - ]

Result: 

NG 

REPLACE AIR FUEL RATIO SENSOR:  REMOVAL [12/2012 - ] 

Result: 

OK 

See step  2

1. Disconnect the air fuel ratio sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Air Fuel Ratio Sensor)

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B8-2 (+B) - Body ground	Ignition switch ON	11 to 14 V

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Disconnect the air fuel ratio sensor 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
   B8-1 (HA1A) - B77-23 (HA1A)	Always	Below 1 Ω
   B8-1 (HA1A) or B77-23 (HA1A) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine and ECT > Clear DTCs 

5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
10. Read the DTCs.

    Powertrain > Engine and ECT > Trouble Codes 

    Result

    Result	Proceed to
    DTC is not output	A
    DTC P0031, P0032 or P101D is output	B

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS:  CHECK FOR INTERMITTENT PROBLEMS [12/2012 - ] 

Result: 

B 

REPLACE ECM:  REMOVAL [12/2012 - ] 

1. Inspect the EFI-MAIN No. 2 relay.

   Refer to PROCEDURE - Step 5

Result: 

NG 

REPLACE EFI-MAIN NO. 2 RELAY 

Result: 

OK 

See step  6

1. Remove the EFI-MAIN NO. 2 relay from the engine room relay block and junction block assembly.
2. Remove the EFI-MAIN NO. 1 relay from the engine room relay block and junction block assembly.
3. Disconnect the air fuel ratio sensor connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   EFI-MAIN NO. 2 relay terminal 3 - B8-2 (+B)	Always	Below 1 Ω
   EFI-MAIN NO. 2 relay terminal 1 - EFI-MAIN NO. 1 relay terminal 3	Always	Below 1 Ω
   EFI-MAIN NO. 2 relay terminal 2 - Body ground	Always	Below 1 Ω
   EFI-MAIN NO. 2 relay terminal 3 or B8-2 (+B) - Body ground	Always	10 kΩ or higher
   EFI-MAIN NO. 2 relay terminal 1 or EFI-MAIN NO. 1 relay terminal 3 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Remove the EFI-MAIN NO. 2 relay from the engine room relay block and junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Engine Room Relay Block and Junction Block Assembly
   *2	EFI-MAIN NO. 2 Relay

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   EFI-MAIN NO. 2 relay terminal 5 - Body ground	Always	11 to 14 V

Result: 

OK 

GO TO ECM POWER SOURCE CIRCUIT:  ECM Power Source Circuit [12/2012 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 2 RELAY - BATTERY)