DTC P0037, P0038, P0141, P102D; Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) [11/2013 - 08/2014]: Procedure

1. Inspect the heated oxygen sensor.

   Refer to INSPECTION [12/2012 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the heated oxygen sensor.

   Refer to INITIALIZATION [12/2012 - ]

Result: 

NG 

REPLACE HEATED OXYGEN SENSOR:  REMOVAL [12/2012 - ] 

Result: 

OK 

See step  2

1. Disconnect the heated oxygen sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Heated Oxygen 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
   B25-2 (+B) - Body ground	Ignition switch ON	11 to 14 V

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Disconnect the heated oxygen 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
   B25-1 (HT1B) - B77-24 (HT1B)	Always	Below 1 Ω
   B25-1 (HT1B) or B77-24 (HT1B) - 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.

   Refer to DTC CHECK / CLEAR [12/2012 - ]

   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 pending DTCs.

    Powertrain > Engine and ECT > Trouble Codes 

    Result

    Result	Proceed to
    DTC is not output	A
    DTC P0037, P0038, P0141 or P102D 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 heated oxygen 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 - B25-2 (+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 B25-2 (+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

See step  7

Result: 

OK 

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

Result: 

NG 

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