Toyota Tundra (2015 year). Manual — part 1882
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000WC10X7X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032,P0051,P0052,P101D,P103D; Oxygen
(A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); 2015 MY Tundra [08/2014 - ]
DTC
P0031
Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
DTC
P0032
Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)
DTC
P0051
Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
DTC
P0052
Oxygen (A/F) Sensor Heater Control Circuit High (Bank 2 Sensor 1)
DTC
P101D
A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON
DTC
P103D
A/F Sensor Heater Circuit Performance Bank 2 Sensor 1 Stuck ON
DESCRIPTION
Refer to DTC P2195
.
HINT:
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0031
P0051
Air-Fuel Ratio (A/F) sensor heater current is less than 0.8 A
(1 trip detection logic).
Open in A/F sensor heater
circuit
A/F sensor heater (for
Sensor 1)
Integration relay
ECM
P0032
P0052
Air-Fuel Ratio (A/F) sensor heater current failure (1 trip
detection logic).
Short in A/F sensor heater
circuit
A/F sensor heater (for
Sensor 1)
Integration relay
ECM
P101D
P103D
The heater current is higher than the specified value while
the heater is not operating (1 trip detection logic).
Open or short in A/F
sensor heater circuit
ECM
MONITOR DESCRIPTION
The ECM uses information from the Air-Fuel Ratio (A/F) sensor to regulate the air-fuel ratio and keep it close
The A/F sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner
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 A/F sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032...
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 A/F sensor becomes inaccurate. As a result, the ECM
is unable to regulate the air-fuel ratio properly.
When the current in the A/F sensor heater is outside the normal operating range, the ECM interprets this as a
malfunction in the sensor heater and sets a DTC.
Example:
The ECM sets DTC P0032 or P0052 when the current in the A/F sensor heater is more than 10 A. Conversely,
when the heater current is less than 0.8 A, DTC P0031 or P0051 is set.
MONITOR STRATEGY
Related DTCs
P0031: A/F sensor heater (for Bank 1) open/short (Low electrical
current)
P0032: A/F sensor heater (for Bank 1) open/short (High electrical
current)
P0051: A/F sensor heater (for Bank 2) open/short (Low electrical
current)
P0052: A/F sensor heater (for Bank 2) open/short (High electrical
current)
P101D: A/F sensor heater (for Bank 1) performance
P103D: A/F sensor heater (for Bank 2) performance
Required Sensors/Components (Main)
A/F sensor heater
Required Sensors/Components
(Related)
-
Duration
10 seconds: P0031 and P0051
10.24 seconds: P0032 and P0052
1 second: P101D and P103D
MIL Operation
Immediate
TYPICAL ENABLING CONDITIONS
P0031 and P0051
Monitor runs whenever following DTCs not stored
None
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
Output duty cycle
10% or more
Heater output duty
30% or more
A/F sensor heater performance failure (P101D, P103D)
Not detected
P0032 and P0052
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032...
Monitor runs whenever following DTCs not stored
None
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
Heater output duty
More than 0%
P101D and P103D
Monitor runs whenever following DTCs not stored
None
Battery voltage
10.5 V or higher
Time after heater ON
10 seconds or more
A/F sensor heater duty-cycle ratio
Less than 60%
Active heater OFF control
Not operating
Active heater ON control
Not operating
Air fuel ratio sensor heater range check low current failure (P0031, P0051)
Not detected
TYPICAL MALFUNCTION THRESHOLDS
P0031 and P0051
Air fuel ratio sensor heater ON current
Less than 0.8 A
P0032 and P0052
Air fuel ratio sensor heater output
ON
Hybrid IC high current limiter port
Fail
P101D and P103D
Air fuel ratio sensor heater OFF current
Higher than 11 A
Hybrid IC high current limiter port
Fail
COMPONENT OPERATING RANGE
A/F sensor heater current
0.8 A or more
CONFIRMATION DRIVING PATTERN
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032...
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