Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P005012,P005013,P101A9E,P103A9E)
DESCRIPTION
Refer to DTC P219519.
Click here .gif)
HINT:
- When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the engine switch is turned off.
- Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
- The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio 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 |
|---|---|---|---|---|---|---|
| P003012 | HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0032 |
| P003013 | HO2S Heater Control Bank 1 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0031 |
| P005012 | HO2S Heater Control Bank 2 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0052 |
| P005013 | HO2S Heater Control Bank 2 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0051 |
| P101A9E | A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On | Air fuel ratio 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: P101D |
| P103A9E | A/F Sensor Heater Performance Bank 2 Sensor 1 Stuck On | Air fuel ratio 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: P103D |
MONITOR DESCRIPTION
The ECM uses information from the air fuel ratio sensor to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases.
The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum-coated zirconia and includes an integrated heating element.
The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.
The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.
When the current in the air fuel ratio sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.
MONITOR STRATEGY
| Related DTCs | P0031: Air fuel ratio sensor (bank 1 sensor 1) heater range check (low current) P0032: Air fuel ratio sensor (bank 1 sensor 1) heater range check (high current) P0051: Air fuel ratio sensor (bank 2 sensor 1) heater range check (low current) P0052: Air fuel ratio sensor (bank 2 sensor 1) heater range check (high current) P101D: Air fuel ratio sensor (bank 1 sensor 1) heater performance P103D: Air fuel ratio sensor (bank 2 sensor 1) heater performance |
| Required Sensors/Components (Main) | Air fuel ratio sensor heater |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 10 seconds: P0031 and P0051 10.24 seconds: P0032 and P0052 1 second: P101D and P103D |
| MIL Operation | Immediate |
| 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 |
| Time after heater on | 5 seconds or more |
| Active heater off control | Not operating |
| Active heater on control | Not operating |
| Air fuel ratio sensor heater performance fail (P101D, P103D) | Not detected |
| Heater output duty cycle | 30% or higher |
| All of the following conditions are met | - |
| Battery voltage | 10.5 V or higher |
| Time after heater on | 5 seconds or more |
| Heater output duty cycle | Higher than 0% |
| Active heater off control | Not operating |
| Active heater on control | Not operating |
| All of the following conditions are met | - |
| Battery voltage | 10.5 V or higher |
| Air fuel ratio sensor heater low current fail (P0031, P0051) | Not detected |
| Heater output duty cycle | Less than 60% |
| Active heater off control | Not operating |
| Active heater on control | Not operating |
TYPICAL MALFUNCTION THRESHOLDS
P0031 and P0051| Heater on current | Less than 0.8 A |
| Both of the following conditions are met | - |
| Command to heater output | On |
| Heater current detected by heater monitor IC | 14 A or higher |
| Both of the following conditions are met | - |
| Heater current detected by heater monitor IC | 14 A or higher |
| Heater off current | Higher than 11 A |
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: P003012, P003013, P005012, P005013, P101A9E or P103A9E.
-
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 P219519.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
-
Refer to "Data List / Active Test" [A/F (O2) Sensor Heater Duty Ratio B1S1 and A/F (O2) Sensor Heater Duty Ratio B2S1].
Click here
-
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.
-
Change the fuel injection volume using the Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the air fuel ratio 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 AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
(a) Inspect the air fuel ratio sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor.
Click here
| NG | .gif) | REPLACE AIR FUEL RATIO SENSOR |
|
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| 2. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR) |
| *a | Front view of wire harness connector (to Air Fuel Ratio Sensor) |
| *b | Bank 1 |
| *c | Bank 2 |
(a) Disconnect the air fuel ratio 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 |
|---|---|---|
| D24-2 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| D23-2 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | | GO TO STEP 5 |
|
| 3. | CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
(a) Disconnect the air fuel ratio 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 |
|---|---|---|
| D24-1 (HA1A) - D2-52 (HA1A) | Always | Below 1 Ω |
| D23-1 (HA2A) - D2-17 (HA2A) | Always | Below 1 Ω |
| D24-1 (HA1A) or D2-52 (HA1A) - Body ground and other terminals | Always | 10 kΩ or higher |
| D23-1 (HA2A) or D2-17 (HA2A) - Body ground and other terminals | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013, P005012, P005013, P101A9E OR P103A9E) |
(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 P003012, P003013, P005012, P005013, P101A9E or P103A9E is output | B |
| A | | CHECK FOR INTERMITTENT PROBLEMS |
| B | | REPLACE ECM |
| 5. | CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - AIR FUEL RATIO SENSOR) |
(a) Disconnect the semiconductor pwr integration ECU connector.
(b) Disconnect the air fuel ratio sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 1F-1 - D24-2 (+B) | Always | Below 1 Ω |
| 1F-1 - D23-2 (+B) | Always | Below 1 Ω |
| 1F-1 or D24-2 (+B) - Body ground and other terminals | Always | 10 kΩ or higher |
| 1F-1 or D23-2 (+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} Repair Manual
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