Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GJ58 |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 04/2020] |
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P003012,P003013,P101A9E; HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery; 2020 MY Corolla Corolla HV [01/2019 - 04/2020] |
DTC
|
P003012
|
HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery
|
DTC
|
P003013
|
HO2S Heater Control Bank 1 Sensor 1 Circuit Open
|
DTC
|
P101A9E
|
A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On
|
DESCRIPTION
Refer to DTC P219519.
Click here
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.
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 the specified value or higher 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
-
DTC for Mexico Models: Applies
|
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
-
DTC for Mexico Models: Applies
|
P101A9E
|
A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On
|
The air fuel ratio sensor heater current is higher than the specified value 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
-
DTC for Mexico Models: Applies
|
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 air fuel 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
Related DTCs
|
P0031: Air fuel ratio sensor (sensor 1) heater range check (low current)
P0032: Air fuel ratio sensor (sensor 1) heater range check (high current)
P101D: Air fuel ratio sensor (sensor 1) heater performance
|
Required Sensors/Components (Main)
|
Air fuel ratio sensor (sensor 1) heater
|
Required Sensors/Components (Related)
|
-
|
Frequency of Operation
|
Continuous
|
Duration
|
1 second: P101D
10 seconds: P0031
10.24 seconds: P0032
|
MIL Operation
|
Immediate
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
P0031
All of the following conditions are met
|
-
|
Auxiliary 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)
|
Not detected
|
Output duty cycle
|
30% or higher
|
P0032
Monitor runs whenever the following DTCs are not stored
|
None
|
All of the following conditions are met
|
-
|
Auxiliary battery voltage
|
10.5 V or higher
|
Time after heater on
|
5 seconds or more
|
Output duty cycle
|
Higher than 0%
|
Active heater off control
|
Not operating
|
Active heater on control
|
Not operating
|
P101D
All of the following conditions are met
|
-
|
Auxiliary battery voltage
|
10.5 V or higher
|
Air fuel ratio sensor heater low current fail (P0031)
|
Not detected
|
Output duty cycle
|
Less than 60%
|
Active heater off control
|
Not operating
|
Active heater on control
|
Not operating
|
TYPICAL MALFUNCTION THRESHOLDS
P0031
Heater on current
|
Less than 0.8 A
|
P0032
Both of the following conditions are met
|
-
|
Command to heater output
|
On
|
Heater current detected by heater monitor IC
|
14 A or higher
|
P101D
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 power switch on (IG).
-
Turn the Techstream 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 Techstream on.
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
-
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] and [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.
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
|
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:
-
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.
Click here
-
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 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
OK
|
|
|
2.
|
CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)
|
*a
|
Front view of wire harness connector
(to Air Fuel Ratio Sensor)
|
(a) Disconnect the air fuel ratio sensor connector.
(b) Turn the power switch on (IG).
(c) 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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - AIR FUEL RATIO SENSOR)
|
OK
|
|
|
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
|
C55-1 (HA1A) - C31-27 (HA1A)
|
Always
|
Below 1 Ω
|
C55-1 (HA1A) or C31-27 (HA1A) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(e) Turn the power switch off and wait for at least 30 seconds.
NEXT
|
|
|
5.
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013 OR P101A9E)
|
(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 P003012, P003013 or P101A9E is output
|
B
|
|