Toyota Tundra (2015 year). Manual — part 1885
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
Learned heater OFF current operation
Succeeded
Heated oxygen sensor heater high current failure (P0038, P0058)
Not detected
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
Hybrid IC high current limiter monitor
Fail
Heated oxygen sensor heater current failure (P0037, P0038, P0057, 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
P0031, P0032, P0051, P0052 (Air fuel
ratio sensor heater)
P0037, P0038, P0057, P0058 (Rear
oxygen sensor heater)
P101D, P102D, P103D, P105D (Air fuel
ratio sensor heater)
Battery voltage
10.5 V or higher
Fuel cut
OFF
Time after fuel cut ON to OFF
30 seconds or more
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P0038...
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
Heated oxygen sensor heater circuit failure (P0037, P0038,
P0057, P0058, P102D and P105D)
Not detected
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 circuit failure (P0037, P0038,
P0057 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
Hybrid IC high current limiter port
Fail
Heated oxygen sensor 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
current
0.4 to 1 A (when engine idles, HO2 sensor warmed up and battery
voltage 11 to 14 V)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P0038...
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 DTCs.
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, or P0161.
12.
Check the DTC judgment result.
TESTER
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
13.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P0038...
OK
TESTER
DISPLAY
DESCRIPTION
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
If no pending DTC is output, perform a universal trip and check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
14.
WIRING DIAGRAM
Refer to DTC P0136
.
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection
procedure.
HINT:
Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far
from the engine assembly.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. 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.
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.
PROCEDURE
1.
INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
(a) Inspect the heated oxygen sensor
.
HINT:
Perform "Inspection After Repair" after replacing the heated oxygen sensor
.
NG
REPLACE HEATED OXYGEN SENSOR
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P0038...
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