Dtc P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

MONITOR RESULT

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

CHECK WHETHER DTC OUTPUT RECURS (DTC P0037, P0038, P0141 OR P102D)

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - NO. 1 INTEGRATION RELAY)

DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

DTC P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

DTC P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

DTC P102D O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON


DESCRIPTION

Refer to DTC P0136 (YARIS_NCP93 RM000000WBY0F2X_01.html).

HINT:
  1. Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.

  2. When any of these DTCs is stored, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)


DTC No.
DTC Detection Condition
Trouble Area
P0037
The heater current is less than the specified value while the heater is operating (1 trip detection logic).
  1. Open in heated oxygen sensor (bank 1 sensor 2) heater circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. ECM
P0038
The heater current is higher than the specified value while the heater is operating (1 trip detection logic).
  1. Short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. ECM
P0141
The cumulative heater resistance correction value exceeds the threshold (2 trip detection logic).
  1. Open or short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. ECM
P102D
The heater current is higher than the specified value while the heater is not operating (1 trip detection logic).
ECM

MONITOR DESCRIPTION

The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.
  1. Heated Oxygen Sensor Heater Range Check (P0037, P0038 and P102D):
    1. The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.
      If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.
  1. Heated Oxygen Sensor Heater Performance (P0141):
    1. After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using 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 heated oxygen sensor heater and stores DTC P0141.

MONITOR STRATEGY


Related DTCs
P0037: Heated Oxygen Sensor Heater (Bank 1 Sensor 2) Open/Short (Low Electrical Current)
P0038: Heated Oxygen Sensor Heater (Bank 1 Sensor 2) Open/Short (High Electrical Current)
P0141: Heated Oxygen Sensor Heater Performance (Bank 1 Sensor 2)
P102D: Heated Oxygen Sensor Heater ON Stuck (Bank 1 Sensor 2)
Required Sensors/Components (Main)
Heated oxygen sensor heater (bank 1 sensor 2)
Required Sensors/Components (Related)
-
Frequency of Operation
Continuous: P0037, P0038, P102D
Once per driving cycle: P0141
Duration
0.5 seconds: P0037
Within 3 seconds: P0038
10 seconds: P0141
0.5 seconds: P102D
MIL Operation
Immediate: P0037, P0038, P102D
2 driving cycles: P0141
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


P0037 (Case 1)
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or higher
Engine
Running
Starter
OFF
Catalyst active air fuel ratio control
Not operating
Time after heater ON
10 seconds or more
Learned heater OFF current operation
Completed
Learned heater OFF current get flag
ON
Heated oxygen sensor heater high current fail (P0038)
Not detected

P0037 (Case 2)
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or higher
Engine
Running
Starter
OFF
Catalyst active air fuel ratio control
Not operating
Time after heater ON
10 seconds or more
Learned heater OFF current operation
Completed
Heated oxygen sensor heater OFF current
Higher than 3.5 A
Hybrid IC high current limiter port
Fail
Heated oxygen sensor heater high current fail (P0038)
Not detected

P0038
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or higher
Engine
Running
Starter
OFF
Catalyst active air fuel ratio control
Not operating
Time after heater ON
10 seconds or more
Learned heater OFF current operation
Completed

P0141
Monitor runs whenever following DTCs not present
None
Heated oxygen sensor heater circuit fail (P0037, P0038 and P102D)
Not detected
Battery voltage
10.5 V or higher
Fuel cut
OFF
Time after fuel cut ON to OFF
30 seconds or more
Accumulated heater ON time
100 seconds or more
Learned heater OFF current operation
Completed
Duration that rear heated oxygen sensor impedance is less than 15 kΩ
2 seconds or more

P102D
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or higher
Engine
Running
Starter
OFF
Catalyst active air fuel ratio control
Not operating
Time after heater ON
10 seconds or more
Learned heater OFF current operation
Completed

TYPICAL MALFUNCTION THRESHOLDS


P0037 (Case 1)
Heater ON current - Learned heater OFF current
0.15 A or less

P0037 (Case 2)
Heated oxygen sensor heater ON current
1 A or less

P0038
Hybrid IC high current limiter port
Fail
Heated oxygen sensor heater output
ON

P0141
Accumulated heater resistance
Varies with sensor element temperature (Example: Higher than 23 Ω)

P102D
Heated oxygen sensor heater ON current
Higher than 1 A

COMPONENT OPERATING RANGE


Heated oxygen sensor heater current
0.4 to 1 A (when engine idles, heated oxygen sensor warmed up and battery voltage 11 to 14 V)

MONITOR RESULT

Refer to detailed information in Checking Monitor Status (YARIS_NCP93 RM000000PDR0B4X.html).

P0141: O2 Sensor Heater / O2 HEATER B1S2
Monitor ID
Test ID
Scaling
Unit
Description
$42
$91
Multiply by 0.001
Ohm
Oxygen sensor heater resistance bank 1 sensor 2

CONFIRMATION DRIVING PATTERN


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine and idle it for 5 minutes or more [B].
  7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
  8. Idle the engine for 5 minutes or more [D].
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
  10. Read pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0037, P0038, P0141 or P102D.
  13. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0T5X.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0031 (YARIS_NCP93 RM000000WC10MFX_07.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
  1. Sensor 1 refers to the sensor closest to the engine assembly.
  2. Sensor 2 refers to the sensor farthest away from the engine assembly.
  3. Refer to "Data List / Active Test" [O2 Heater B1S2 and O2 Heater Curr Val B1S2] (YARIS_NCP93 RM000000SXS05AX.html).
  4. When the values for the Data List item O2 Heater Curr Val B1S2 is not 0 A, the heater is on.
  5. Read freeze frame data using the Techstream. 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.
  6. Change the fuel injection volume using the Control the Injection Volume function provided in the Active Test and monitor the heated oxygen sensor output voltage (YARIS_NCP93 RM000000WBY0F2X_10.html). If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.
1.INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

  1. Inspect the heated oxygen sensor (YARIS_NCP93 RM000003VIN00GX.html).



NG
REPLACE HEATED OXYGEN SENSOR (YARIS_NCP93 RM000003VIP00IX.html)
OK


2.INSPECT TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

  1. Disconnect the heated oxygen sensor connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D145-2 (+B) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Heated Oxygen Sensor)


NG
Go to step 5
OK


3.CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

  1. Disconnect the heated oxygen sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D145-1 (HT1B) - C51-22 (HT1B)
    		Always
    		Below 1 Ω
    D145-1 (HT1B) or C51-22 (HT1B) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK WHETHER DTC OUTPUT RECURS (DTC P0037, P0038, P0141 OR P102D)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear the DTCs (YARIS_NCP93 RM000000PDK0T5X.html).

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

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Start the engine.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read pending DTCs.

Result
Result
Proceed to
DTC is not output
A
DTC P0037, P0038, P0141 or P102D is output
B


B
REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (YARIS_NCP93 RM000000PDQ0Q2X.html)

5.CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - NO. 1 INTEGRATION RELAY)

  1. Disconnect the heated oxygen sensor connector.

  1. Remove the No. 1 integration relay from the engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D145-2 (+B) - 1D-11
    		Always
    		Below 1 Ω
    D145-2 (+B) or 1D-11 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (YARIS_NCP93 RM000001F7102NX.html)