Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: 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 .gif)
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). |
| 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). |
| 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). |
| 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). |
| 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). |
| 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). |
| 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). |
| 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). |
| 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.
- 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
All| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Heater on current | 1 A or less |
| Both of the following conditions are met | - |
| Heater current detected by heater monitor IC | 4 A or higher |
| Command to heater output | On |
| Heater resistance | Varies with sensor element temperature (Example: Higher than 23 Ω) |
| Heater on current | Higher than 1 A |
MONITOR RESULT
Refer to detailed information in Checking Monitor Status.
Click here
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $42 | $91 | Multiply by 0.001 | Ohm | Oxygen sensor heater resistance bank 1 sensor 2 |
| 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
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) [A].
- Turn the Techstream on.
- Start the engine and idle it for 5 minutes or more [B].
- With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
- Idle the engine for 5 minutes or more [D].
- Enter the following menus: Powertrain / Engine / Trouble Codes [E].
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P003612, P003614, P005612, P005614, P014118, P016118, P102A9E or P105A9E.
-
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 | .gif) | REPLACE HEATED OXYGEN SENSOR |
|
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| 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 |
|---|---|---|
| J68-1 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| D49-2 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | | GO TO STEP 5 |
|
| 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 |
|---|---|---|
| J68-2 (HT1B) - D2-50 (HT1B) | Always | Below 1 Ω |
| D49-1 (HT2B) - D2-16 (HT2B) | Always | Below 1 Ω |
| J68-2 (HT1B) or D2-50 (HT1B) - Body ground and other terminals | Always | 10 kΩ or higher |
| D49-1 (HT2B) or D2-16 (HT2B) - Body ground and other terminals | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003614, P005612, P005614, P014118, P016118, P102A9E OR P105A9E) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs(e) Turn the engine switch off and wait for at least 30 seconds.
(f) Turn the engine switch on (IG).
(g) Turn the Techstream on.
(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes.
(j) 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 |
| 5. | CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - HEATED OXYGEN SENSOR) |
(a) Disconnect the semiconductor pwr integration ECU connector.
(b) Disconnect the heated oxygen sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 1G-2 - J68-1 (+B) | Always | Below 1 Ω |
| 1G-1 - D49-2 (+B) | Always | Below 1 Ω |
| 1G-2 or J68-1 (+B) - Body ground and other terminals | Always | 10 kΩ or higher |
| 1G-1 or D49-2 (+B) - Body ground and other terminals | Always | 10 kΩ or higher |
| OK | | REPLACE SEMICONDUCTOR POWER INTEGRATION ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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