Toyota Tundra Service Manual: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) (P0037,P0038,P0057,P0058,P0141,P0161,P102D,P105D)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) (P0037,P0038,P0057,P0058,P0141,P0161,P102D,P105D)

DESCRIPTION

  • Refer to DTC P0136 (See page ).

HINT:

  • When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
  • The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The HO2 sensor heater circuit uses a relay on the +B side of the circuit.

DTC No.

DTC Detection Condition

Trouble Area

P0037

P0057

The heater current is less than the specified value while the heater is operating.

(1 trip detection logic)

  • Open in HO2 sensor heater circuit
  • HO2 sensor heater (for Sensor 2)
  • Integration relay
  • ECM

P0038

P0058

The heater current is higher than the specified value while the heater is operating.

(1 trip detection logic)

  • Short in HO2 sensor heater circuit
  • HO2 sensor heater (for Sensor 2)
  • Integration relay
  • ECM

P0141

P0161

The cumulative heater resistance correction value exceeds the threshold.

(2 trip detection logic)

  • Open or short in HO2 sensor heater circuit
  • HO2 sensor heater (for Sensor 2)
  • Integration relay
  • ECM

P102D

P105D

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 (HO2) 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.

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

The ECM monitors the current applied to the HO2 sensor heater to check the heater for malfunctions.

If the heater current is outside the normal range, the signal transmitted by the HO2 sensor becomes inaccurate. When the current in the HO2 sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

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 stores 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)

-

Frequency of Operation

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

Once per driving cycle: P0141 and P0161

Duration

0.5 seconds: P0037 and P0057

Within 3 seconds: P0038 and P0058

10 seconds: P0141 and P0161

0.5 seconds: P102D and P105D

MIL Operation

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

2 driving cycles: P0141 and P0161

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P0037 and P0057 (Case 1)

Monitor runs whenever following DTCs not stored

P0038, 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

Heater OFF current operation

Succeeded

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

P0038, 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 OFF current

Higher than 3.5 A

Hybrid IC high current limiter port

Fail

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 (Case 1)

Monitor runs whenever following DTCs not stored

P0037, P0038, P0057, P0058, P102D, P105D (Rear oxygen sensor heater)

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

Complete

P0141 and P0161 (Case 2)

Monitor runs whenever following DTCs not stored

None

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

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

Hybrid IC high current limiter port

Fail

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: Higher 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)

MONITOR RESULT

Refer to Checking Monitor Status (See page ).

CONFIRMATION DRIVING PATTERN

  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 operation).
  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 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.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0037, P0038, P0057, P0058, P0141, P0161, P102D or P105D.
  13. 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

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
  14. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
  15. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0136 (See page ).

CAUTION / NOTICE / HINT

HINT:

  • 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.
  • 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.

PROCEDURE

1.

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

(a) Inspect the heated oxygen sensor (See page ).

HINT:

Perform "Inspection After Repair" after replacing the heated oxygen sensor (See page ).

NG

REPLACE HEATED OXYGEN SENSOR

OK

2.

CHECK TERMINAL VOLTAGE (+B OF HO2 SENSOR)

(a) Disconnect the HO2 sensor connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D31-2 (+B) - Body ground

Ignition switch ON

11 to 14 V

D32-2 (+B) - Body ground

Ignition switch ON

11 to 14 V

Result

Result

Proceed to

NG

A

OK

B

B

GO TO STEP 5

A

3.

INSPECT INTEGRATION RELAY (EFI)

(a) Remove the integration relay from the engine room relay block.

(b) Inspect the EFI NO. 1 fuse.

(1) Remove the EFI NO. 1 fuse from the integration relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

EFI NO. 1 fuse

Always

Below 1 Ω

(3) Reinstall the EFI NO. 1 fuse.

(c) Inspect the EFI relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2C-1 - 2B-4

No battery voltage applied to terminals 2B-2 and 2B-3

10 kΩ or higher

Battery voltage applied to terminals 2B-2 and 2B-3

Below 1 Ω

NG

REPLACE INTEGRATION RELAY (EFI)

OK

4.

CHECK HARNESS AND CONNECTOR (HO2 SENSOR - INTEGRATION RELAY)

(a) Check the EFI NO. 2 fuse.

(1) Remove the EFI NO. 2 fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

EFI NO. 2 fuse

Always

Below 1 Ω

(3) Reinstall the EFI NO. 2 fuse.

(b) Disconnect the HO2 sensor connector.

(c) Remove the integration relay from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D31-2 (+B) - 2B-4

Always

Below 1 Ω

D32-2 (+B) - 2B-4

Always

Below 1 Ω

D31-2 (+B) or 2B-4 - Body ground

Always

10 kΩ or higher

D32-2 (+B) or 2B-4 - Body ground

Always

10 kΩ or higher

OK

CHECK ECM POWER SOURCE CIRCUIT

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM)

(a) Disconnect the HO2 sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D31-1 (HT1B) - D74-45 (HT1B)

Always

Below 1 Ω

D32-1 (HT2B) - D74-44 (HT2B)

Always

Below 1 Ω

D31-1 (HT1B) or D74-45 (HT1B) - Body ground

Always

10 kΩ or higher

D32-1 (HT2B) or D74-44 (HT2B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear DTCs (See page ).

(e) Start the engine.

(f) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(g) Read the output pending DTCs using the Techstream.

Result

Result

Proceed to

No pending DTC is output

A

Pending DTC P0037, P0038, P0057, P0058, P0141, P0161, P102D and/or P105D is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE ECM

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