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DI-507
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRA-01
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)
HINT:
Although each DTC title (DTC description) says "oxygen sensor", these DTCs are related to the "A/F sensor".
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page DI-806.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The A/F sen-
sor heater circuit uses a relay on the B+ side of the circuit.
Reference (Bank 1 Sensor 1 System Drawing):
A/F Relay A/F Sensor ECM
From Heater HA1A
Battery
A/F Heater
Fuse Sensor A1A+
Duty
Control
A1A-
To EFI Relay
A23512
DTC No. DTC Detection Condition Trouble Area
P0031 Heated current is 0.8 A or less when heater operates S Open or short in heater circuit of A/F sensor
P0051 (1 trip detection logic) S A/F sensor heater
P0032 When the heater operates, heated current exceeds 19.7 A S A/F sensor heater relay
P0052 (1 trip detection logic) S ECM
DI-508
DIAGNOSTICS - ENGINE (2UZ-FE)
HINT:
S Bank 1 refers to the bank that includes cylinder No.1.
S Bank 2 refers to the bank that does not include cylinder No.1.
S Sensor 1 refers to the sensor closest to the engine assembly.
S Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR DESCRIPTION
The ECM uses the Air-Fuel Ratio sensor (A/F sensor) information to regulate the air-fuel ratio close to the
stoichiometric ratio. This maximizes the catalytic converter's ability to purify exhaust gases. The sensor de-
tects oxygen levels in the exhaust gas and sends this signal to the ECM.
The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element
is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an inte-
grated heating element. The zirconia element generates a small voltage when there is a large difference in
the oxygen concentrations of the exhaust and the outside air. The platinum coating amplifies the voltage
generation. When heated, the sensor becomes very efficient. If the temperature of the exhaust is low, the
sensor will not generate useful voltage signals without supplemental heating. The ECM regulates the sup-
plemental heating using a duty-cycle approach to regulate the average current in the heater element. If the
heater current is out of the normal range, the sensor's output signals will be inaccurate and the ECM can
not regulate the air-fuel ratio properly.
When the heater current is out of the normal operating range, the ECM interprets this as a malfunction and
sets a DTC.
MONITOR STRATEGY
A/F sensor heater (Bank 1) range check (Low
P0031
current)
A/F sensor heater (Bank 1) range check (High
P0032
current)
Related DTC
R l t d DTCs
A/F sensor heater (Bank 2) range check (Low
P0051
current)
A/F sensor heater (Bank 2) range check (High
P0052
current)
Main sensors/components A/F sensor heater
Required sensors/components
R i d / t
Related sensors/components -
Frequency of operation Continuous
Duration 10 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
P0031, P0051 (Low current):
Battery voltage 10.5 V -
A/F sensor heater duty ratio 50% -
Time after engine start 10 sec. -
DI-509
DIAGNOSTICS - ENGINE (2UZ-FE)
P0032, P0052 (High current):
Time after engine start 10 sec. -
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P0031, P0051 (Low current):
A/F sensor heater current Less than 0.8 A
P0032, P0052 (High current):
A/F sensor heater current More than 10 A
COMPONENT OPERATING RANGE
Parameter Standard Value
A/F sensor heater current 1.8 to 3.4 A at 20◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo