Lexus ES manuals

Lexus ES: HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery (P003612,P003614,P005612,P005614,P014118,P016118,P102A9E,P105A9E)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery (P003612,P003614,P005612,P005614,P014118,P016118,P102A9E,P105A9E)

DESCRIPTION

Refer to DTC P013611.

Click here

HINT:

  • When any of these DTCs are 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 engine switch is turned off.
  • The heated oxygen sensor heater circuit uses a relay on the +B side of the circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P003612

HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery

Heated oxygen sensor heater current reaches high limit (1 trip detection logic).

  • Short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  • Heated oxygen sensor (bank 1 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0038

P003614

HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open

Heated oxygen sensor heater current is the specified value or less while the heater is operating (1 trip detection logic).

  • Open or short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  • Heated oxygen sensor (bank 1 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0037

P005612

HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Battery

Heated oxygen sensor heater current reaches high limit (1 trip detection logic).

  • Short in heated oxygen sensor (bank 2 sensor 2) heater circuit
  • Heated oxygen sensor (bank 2 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0058

P005614

HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Ground or Open

Heated oxygen sensor heater current is the specified value or less while the heater is operating (1 trip detection logic).

  • Open or short in heated oxygen sensor (bank 2 sensor 2) heater circuit
  • Heated oxygen sensor (bank 2 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0057

P014118

O2 Sensor Heater Circuit Bank 1 Sensor 2 Circuit Current Below Threshold

The cumulative heater resistance correction value exceeds the threshold (2 trip detection logic).

  • Open or short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  • Heated oxygen sensor (bank 1 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0141

P016118

O2 Sensor Heater Circuit Bank 2 Sensor 2 Circuit Current Below

The cumulative heater resistance correction value exceeds the threshold (2 trip detection logic).

  • Open or short in heated oxygen sensor (bank 2 sensor 2) heater circuit
  • Heated oxygen sensor (bank 2 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P0161

P102A9E

O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On

Heated oxygen sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic).

  • Short in heated oxygen sensor (bank 1 sensor 2) heater circuit
  • Heated oxygen sensor (bank 1 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P102D

P105A9E

O2 Sensor Heater Performance Bank 2 Sensor 2 Stuck On

Heated oxygen sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic).

  • Short in heated oxygen sensor (bank 2 sensor 2) heater circuit
  • Heated oxygen sensor (bank 2 sensor 2)
  • ECM

Comes on

DTC stored

SAE Code: P105D

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.

Heated Oxygen Sensor Heater Range Check (P003612, P003614, P005612, P005614, P102A9E and P105A9E):

  • 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.

Heated Oxygen Sensor Heater Performance (P014118 and P016118):

  • 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 P014118 and P016118.

MONITOR STRATEGY

Related DTCs

P0037: Heated oxygen sensor (bank 1 sensor 2) heater range check (low current)

P0038: Heated oxygen sensor (bank 1 sensor 2) heater range check (high current)

P0057: Heated oxygen sensor (bank 2 sensor 2) heater range check (low current)

P0058: Heated oxygen sensor (bank 2 sensor 2) heater range check (high current)

P0141: Heated oxygen sensor (bank 1 sensor 2) heater performance

P0161: Heated oxygen sensor (bank 2 sensor 2) heater performance

P102D: Heated oxygen sensor (bank 1 sensor 2) heater performance

P105D: Heated oxygen sensor (bank 2 sensor 2) heater performance

Required Sensors/Components (Main)

Heated oxygen sensor (sensor 2) heater

Required Sensors/Components (Related)

-

Frequency of Operation

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

Once per driving cycle: P0141, P0161

Duration

0.5 seconds: P0037, P0057, P102D, P105D

2.064 seconds: P0038, P0058

10 seconds: P0141, P0161

MIL Operation

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

2 driving cycles: P0141, P0161

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P0037 and P0057: (Case 1)

All of the following conditions are met

-

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 operation

Succeeded

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

Not detected

Heater on current - Learned heater off current

0.15 A or less

Command to heater output

On

P0037 and P0057: (Case 2)

All of the following conditions are met

-

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 high current fail (P0038, P0058)

Not detected

Heater off current

Higher than 3.5 A

Heater current detected by heater monitor IC

4 A or higher

P0038 and P0058

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

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 and P0161

All of the following conditions are met

-

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

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 heated oxygen sensor impedance is less than 15 kΩ

2 seconds or more

P102D and P105D

All of the following conditions are met

-

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 low current fail (P0037, P0057)

Not detected

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

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0037 and P0057: (Case 1)

Heater on current - Learned heater off current

0.15 A or less

P0037 and P0057: (Case 2)

Heater on current

1 A or less

P0038 and P0058

Both of the following conditions are met

-

Heater current detected by heater monitor IC

4 A or higher

Command to heater output

On

P0141 and P0161

Heater resistance

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

P102D and P0105D

Heater on current

Higher than 1 A

MONITOR RESULT

Refer to detailed information in Checking Monitor Status.

Click here

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

P0161: O2 Sensor Heater / O2 HEATER B2S2

Monitor ID

Test ID

Scaling

Unit

Description

$46

$91

Multiply by 0.001

Ohm

Oxygen sensor heater resistance bank 2 sensor 2

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Start the engine and idle it for 5 minutes or more [B].
  9. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
  10. Idle the engine for 5 minutes or more [D].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  12. 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.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P003612, P003614, P005612, P005614, P014118, P016118, P102A9E or P105A9E.
  15. Check the DTC judgment result.

    Techstream 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [B] through [E] again.
    • [A] to [E]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P013611.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

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 transaxle.

  • 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.
  • Refer to "Data List / Active Test" [O2 Sensor Heater B1S2, O2 Sensor Heater Current Value B1S2, O2 Sensor Heater B2S2 and O2 Sensor Heater Current Value B2S2].

    Click here

  • When the values for the Data List item O2 Sensor Heater Current Value B1S2 and O2 Sensor Heater Current Value B2S2 are not 0 A, the heater is on.
  • Change the fuel injection volume using the Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the heated oxygen sensor output voltage (Click here ). If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.
  • 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.

PROCEDURE

1.

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

(a) Inspect the heated oxygen sensor.

Click here

HINT:

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

Click here

NG

REPLACE HEATED OXYGEN SENSOR

OK

2.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)

*a

Front view of wire harness connector

(to Heated Oxygen Sensor)

*b

Bank 1

*c

Bank 2

-

-

(a) Disconnect the heated oxygen sensor connector.

(b) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C28-2 (+B) - Body ground

Engine switch on (IG)

11 to 14 V

C29-2 (+B) - Body ground

Engine switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 - HEATED OXYGEN SENSOR)

OK

3.

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

(a) Disconnect the heated oxygen 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

C28-1 (HT1B) - C32-50 (HT1B)

Always

Below 1 Ω

C29-1 (HT2B) - C32-16 (HT2B)

Always

Below 1 Ω

C28-1 (HT1B) or C32-50 (HT1B) - Body ground and other terminals

Always

10 kΩ or higher

C29-1 (HT2B) or C32-16 (HT2B) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

NEXT

5.

CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003614, P005612, P005614, P014118, P016118, P102A9E OR P105A9E)

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

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P003612, P003614, P005612, P005614, P014118, P016118, P102A9E or P105A9E is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE ECM

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