Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018DL4 |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 - 08/2018] |
Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P003012,P003013,P005012,P005013,P101A9E,P103A9E; HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery; 2018 MY Sienna [11/2017 - 08/2018] |
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
|
P005012
|
HO2S Heater Control Bank 2 Sensor 1 Circuit Short to Battery
|
DTC
|
P005013
|
HO2S Heater Control Bank 2 Sensor 1 Circuit Open
|
DTC
|
P101A9E
|
A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On
|
DTC
|
P103A9E
|
A/F Sensor Heater Performance Bank 2 Sensor 1 Stuck On
|
DESCRIPTION
Refer to DTC P21951D.
Click here
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 ignition 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).
|
-
Short in air fuel ratio sensor (bank 1 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 1 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
|
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).
|
-
Open or short in air fuel ratio sensor (bank 1 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 1 sensor 1)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0031
-
DTC for Mexico Models: Applies
|
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).
|
-
Short in air fuel ratio sensor (bank 2 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 2 sensor 1)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0052
-
DTC for Mexico Models: Applies
|
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).
|
-
Open or short in air fuel ratio sensor (bank 2 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 2 sensor 1)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0051
-
DTC for Mexico Models: Applies
|
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).
|
-
Short in air fuel ratio sensor (bank 1 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 1 sensor 1)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P101D
-
DTC for Mexico Models: Applies
|
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).
|
-
Short in air fuel ratio sensor (bank 2 sensor 1) heater circuit
-
Air fuel ratio sensor (bank 2 sensor 1)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P103D
-
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 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
P0031 and P0051
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) (Pending / MIL)
|
Not detected
|
Heater output duty cycle
|
30% or higher
|
P0032 and P0052
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
|
Heater output duty cycle
|
Higher than 0%
|
Active heater off control
|
Not operating
|
Active heater on control
|
Not operating
|
P101D and P103D
All of the following conditions are met
|
-
|
Battery voltage
|
10.5 V or higher
|
Air fuel ratio sensor heater low current fail (P0031,P0051) (Pending / MIL)
|
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
|
P0032 and P0052
Both of the following conditions are met
|
-
|
Command to heater output
|
On
|
Heater current detected by heater monitor IC
|
14 A or higher
|
P101D and P103D
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 ignition switch to ON and turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON and turn the Techstream on [A].
-
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
|
WIRING DIAGRAM
Refer to DTC P21951D.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
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)
|
*b
|
Bank 1
|
*c
|
Bank 2
|
(a) Disconnect the air fuel ratio sensor connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
B14-2 (+B) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
B13-2 (+B) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
OK
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
|
(a) Disconnect the B14 and B13 air fuel ratio sensor connectors.
(b) Disconnect the B67 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
B14-1 (HA1A) - B67-52 (HA1A)
|
Always
|
Below 1 Ω
|
B13-1 (HA2A) - B67-17 (HA2A)
|
Always
|
Below 1 Ω
|
B14-1 (HA1A) or B67-52 (HA1A) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
B13-1 (HA2A) or B67-17 (HA2A) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
4.
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013, P005012, P005013, P101A9E OR P103A9E)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Turn the ignition switch to ON.
(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.
Result
|
Proceed to
|
DTCs are not output
|
A
|
DTC P003012, P003013, P005012, P005013, P101A9E or P103A9E is output
|
B
|
(a) Inspect the A/F HTR relay.
Click here
NG |
|
REPLACE A/F HTR RELAY
|
OK
|
|
|
6.
|
CHECK HARNESS AND CONNECTOR (A/F HTR RELAY - AIR FUEL RATIO SENSOR))
|
(a) Remove the A/F HTR relay.
(b) Disconnect the B13 and B14 air fuel ratio sensor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
3 (A/F HTR relay holder) - B14-2 (+B)
|
Always
|
Below 1 Ω
|
3 (A/F HTR relay holder) - B13-2 (+B)
|
Always
|
Below 1 Ω
|
3 (A/F HTR relay holder) or B14-2 (+B) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
3 (A/F HTR relay holder) or B13-2 (+B) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|