8ZR-FXE ENGINE CONTROL SFI SYSTEM P003012 HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery P003013 HO2S Heater Control Bank 1 Sensor 1 Circuit Open P101A9E A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On
DESCRIPTION
The air fuel ratio sensor generates voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.
The air fuel ratio sensor is a planar type and integrated with a heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), current flows to the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are a narrow type. The heat generated by the heater is conducted to the solid electrolyte through alumina, therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel ratio.
*: Value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.
- HINT:
- ·
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
·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 power switch is turned off.
·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.
0.083,0.094 2.708,0.354 2.625,0.26 10 false Reference (System Diagram of Sensor 1): 0.229,1.135 1.094,1.719 0.865,0.583 10 false from Auxiliary Battery 1.094,1.302 1.729,1.708 0.635,0.406 10 false EFI-MAIN NO. 2 1.802,2.333 2.448,2.76 0.646,0.427 10 false EFI-MAIN NO. 2 3.385,2.01 4.854,2.271 1.469,0.26 10 false Air Fuel Ratio Sensor 3.26,1.552 3.771,1.74 0.51,0.188 10 false A1A- 4.438,1.552 4.948,1.74 0.51,0.188 10 false A1A+ 4.427,1.031 4.938,1.219 0.51,0.188 10 false HA1A 3.365,1.042 3.875,1.229 0.51,0.188 10 false +B 3.781,0.854 4.292,1.042 0.51,0.188 10 false Heater 3.781,1.302 4.292,1.49 0.51,0.188 10 false Sensor 4.948,1.031 5.458,1.219 0.51,0.188 10 false HA1A 4.969,1.563 5.479,1.75 0.51,0.188 10 false A1A+ 4.979,2.104 5.49,2.292 0.51,0.188 10 false A1A- 6.167,1.667 6.656,2.031 0.49,0.365 10 false Duty Control 5.729,3.281 6.24,3.469 0.51,0.188 10 false ECM 0.125,2.042 1.083,2.667 0.958,0.625 10 false from EFI-MAIN NO. 1 Relay
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P003012 | HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery | The air fuel ratio sensor heater current is more than the specified value while the heater is operating (1 trip detection logic). | ·
Short in air fuel ratio sensor (sensor 1) heater circuit ·
Air fuel ratio sensor (sensor 1) ·
ECM |
Comes on | DTC stored | SAE Code: P0032 |
| P003013 | HO2S Heater Control Bank 1 Sensor 1 Circuit Open | The air fuel ratio sensor heater current is less than the specified value while the heater is operating (1 trip detection logic). | ·
Open or short in air fuel ratio sensor (sensor 1) heater circuit ·
Air fuel ratio sensor (sensor 1) ·
ECM |
Comes on | DTC stored | SAE Code: P0031 |
| P101A9E | A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On | The air fuel ratio sensor heater voltage level is low while the heater is not operating (1 trip detection logic). | ·
Short in air fuel ratio sensor (sensor 1) heater circuit ·
Air fuel ratio sensor (sensor 1) ·
ECM |
Comes on | DTC stored | SAE Code: P101D |
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 ratio. 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 a useful voltage 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 of the sensor heater and stores a DTC.
MONITOR STRATEGY
| Required Sensors/Components | Air fuel ratio sensor (sensor 1) heater |
| Frequency of Operation | Continuous |
TYPICAL ENABLING CONDITIONS
| Output duty cycle | 7% or higher |
| Output duty cycle | 7% or higher |
| Output duty cycle | Less than 75% |
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.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) [A].
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
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 2500 rpm for 1 minute [C].
- HINT:
-
During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform steps [C] through [D] after charge control has completed.
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 or P101A9E.
Check the DTC judgment result.
| GTS 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 auxiliary 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
CAUTION / NOTICE / HINT
- NOTICE:
- ·
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
·If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
·Inspect the fuses for circuits related to this system before performing the following procedure.
- HINT:
- ·
The operation of the air fuel ratio sensor heater can be checked by referring to the Data List item A/F (O2) Sensor Heater Duty Ratio B1S1.
·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 Active Test [Control the Injection Volume for A/F Sensor] and monitor the air fuel ratio sensor output voltage (Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>P013611202304,999999,_51,_080778,_0393982,RM100000002BFDX,P013611). If the air fuel ratio sensor output voltage does not change (almost no reaction) while performing the Active Test, the air fuel ratio sensor may be malfunctioning.
·Read Freeze Frame Data using the GTS. 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
Inspect the air fuel ratio sensor.
- HINT:
-
Perform "Inspection After Repair" after replacing the air fuel ratio sensor.
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Air Fuel Ratio Sensor) |
Disconnect the air fuel ratio sensor connector.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition C55-2 (+B) - Body ground Power switch on (IG) 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Disconnect the air fuel ratio sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C55-1 (HA1A) - C155-28 (HA1A) Always Below 1 Ω C55-1 (HA1A) or C155-28 (HA1A) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the power switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTCs are not output A DTC P003012, P003013 or P101A9E is output B
A
B
Inspect the EFI-MAIN NO. 2 relay.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly |
| *2 | EFI-MAIN NO. 2 Relay |
Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage (for TFTM made):
Tester Connection Condition Specified Condition 3 (EFI-MAIN NO. 2 relay) - Body ground Always 11 to 14 V
- Standard Voltage (for GTMC made):
Tester Connection Condition Specified Condition 5 (EFI-MAIN NO. 2 relay) - Body ground Always 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 (EFI-MAIN NO. 2 relay) - Body ground Always Below 1 Ω
- Result:
Proceed to OK NG
OK
NG
Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
Disconnect the air fuel ratio sensor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (for TFTM made):
Tester Connection Condition Specified Condition 5 (EFI-MAIN NO. 2 relay) - C55-2 (+B) Always Below 1 Ω 5 (EFI-MAIN NO. 2 relay) or C55-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
- Standard Resistance (for GTMC made):
Tester Connection Condition Specified Condition 3 (EFI-MAIN NO. 2 relay) - C55-2 (+B) Always Below 1 Ω 3 (EFI-MAIN NO. 2 relay) or C55-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG