Toyota Tundra (2015 year). Manual — part 1509

Heated oxygen sensor heater range check (P0037, P0038, P0057,
P0058, P102D and P105D):

The ECM monitors the current applied to the O2 sensor heater to check the heater for malfunctions. If the

current is below the threshold value, the ECM determines that there is an open circuit in the heater. If the

current is above the threshold value, the ECM determines that there is a short circuit in the heater.

The ECM constantly monitors the current applied to the heater. If the ECM detects an open or short circuit, the

ECM turns the MIL on and sets a DTC.

If a malfunction is detected, the ECM cuts off the current applied to the heater.

Heated oxygen sensor heater performance (P0141 and P0161):

After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using

the battery voltage and the current applied to the heater.

If the resistance is above the threshold value, the ECM determines that there is a malfunction in the HO2

sensor heater and sets DTC P0141 or P0161.

MONITOR STRATEGY

Related DTCs

P0037: Heated oxygen sensor heater (for Bank 1) range check (Low

electrical current)

P0038: Heated oxygen sensor heater (for Bank 1) range check (High

electrical current)

P0057: Heated oxygen sensor heater (for Bank 2) range check (Low

electrical current)

P0058: Heated oxygen sensor heater (for Bank 2) range check (High

electrical current)

P0141: Heated oxygen sensor heater performance (for Bank 1)

P0161: Heated oxygen sensor heater performance (for Bank 2)

P102D: Heated oxygen sensor heater stuck ON (for Bank 1 Sensor 2)

P105D: Heated oxygen sensor heater stuck ON (for Bank 2 Sensor 2)

Required Sensors/Components

(Main)

Heated oxygen sensor heater

Required Sensors/Components

(Related)

-

Once per driving cycle: P0141 and P0161

Duration

0.5 seconds: P0037, P0057, P102D and P105D

Within 3 seconds: P0038 and P0058

10 seconds: P0141 and P0161

MIL Operation

Immediate: P0037, P0038, P0057, P0058, P102D and P105D

2 driving cycles: P0141 and P0161

TYPICAL ENABLING CONDITIONS

P0037 and P0057 (Case 1)

Monitor runs whenever following DTCs not stored

None

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P003...

Battery voltage

10.5 V or higher

Engine

Running

Starter

OFF

Catalyst active A/F control

Not operating

Time after heater ON

10 seconds or more

Learned heater OFF current operation

Complete

Heater OFF current learned value

Succeeded

Heated oxygen sensor heater high current fail (P0038, P0058)

Not detected

Heater ON current - Learned heater OFF current

0.3 A or less

Heater output

ON

P0037 and P0057 (Case 2)

Monitor runs whenever following DTCs not stored

None

Battery voltage

10.5 V or higher

Engine

Running

Starter

OFF

Catalyst active A/F control

Not operating

Time after heater ON

10 seconds or more

Learned heater OFF current operation

Complete

Heated oxygen sensor heater OFF current

Higher than 3.5 A

Heater current detected by heater monitor IC

4 A or more

Heated oxygen sensor heater low current fail (P0037, P0057)

Not detected

Heated oxygen sensor heater high current fail (P0038, P0058)

Not detected

P0038 and P0058

Monitor runs whenever following DTCs not stored

None

Battery voltage

10.5 V or higher

Engine

Running

Starter

OFF

Catalyst active A/F control

Not operating

Time after heater ON

10 seconds or more

Learned heater OFF current operation

Complete

P0141 and P0161

Monitor runs whenever following DTCs not stored

None

Heated oxygen sensor heater circuit fail (P0037, P0038, P0057, P0058, P102D and

P105D)

Not detected

Battery voltage

10.5 V or higher

Fuel cut

OFF

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P003...

Time after fuel cut ON to OFF

30 seconds or more

Accumulated heater ON time

100 seconds or

more

Learned heater OFF current operation

Complete

Duration that rear heated oxygen sensor impedance is less than 15 kΩ

2 seconds or more

P102D and P105D

Monitor runs whenever following DTCs not stored

P0031, P0032, P0051, P0052 (Air fuel ratio sensor

heater)

P0037, P0038, P0057, P0058 (Rear oxygen sensor

heater)

Battery voltage

10.5 V or higher

Engine

Running

Starter

OFF

Catalyst active A/F control

Not operating

Time after heater ON

10 seconds or more

Learned heater OFF current operation

Complete

Heated oxygen sensor heater low current fail (P0037

and P0057)

Not detected

Heated oxygen sensor heater high current fail (P0038

and P0058)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0037 and P0057 (Case 1)

Heater current - Learned heater OFF current

0.3 A or less

P0037 and P0057 (Case 2)

Heated oxygen sensor heater ON current

1 A or less

P0038 and P0058

Heater current detected by heater monitor IC

4 A or more

Command to heater output

ON

P0141 and P0161

Accumulated heater resistance

Varies with sensor element temperature (Example: More than 23 Ω)

P102D and P105D

Heated oxygen sensor heater ON current

Higher than 1 A

COMPONENT OPERATING RANGE

Heated Oxygen (HO2) sensor heater

0.4 to 1 A (when engine idles, HO2 sensor warmed up and battery

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P003...

current

voltage 11 to 14 V)

MONITOR RESULT

Refer to CHECKING MONITOR STATUS

.

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.

1.

Turn the ignition switch to ON and turn the Techstream ON.

2.

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

3.

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

4.

Turn the ignition switch to ON and turn the Techstream on [A].

5.

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

6.

7.

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

8.

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

9.

Read the pending DTC.

HINT:

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

10.

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

11.

Input the DTC: P0037, P0038, P0057, P0058, P0141, P0161, P102D or P105D.

12.

Check the DTC judgment result.

TESTER

DISPLAY

DESCRIPTION

NORMAL

DTC judgment completed

System normal

ABNORMAL

DTC judgment completed

System abnormal

13.

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P003...