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DI-826
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDS5-01
DTC P2238 Oxygen Sensor Pumping Current Circuit
Low (For A/F Sensor)(Bank 1 Sensor1)
DTC P2239 Oxygen Sensor Pumping Current Circuit
High (For A/F Sensor)(Bank 1 Sensor1)
DTC P2241 Oxygen Sensor Pumping Current Circuit
Low (For A/F Sensor)(Bank 2 Sensor1)
DTC P2242 Oxygen Sensor Pumping Current Circuit
High (For A/F Sensor)(Bank 2 Sensor1)
DTC P2252 Oxygen Sensor Reference Ground Circuit
Low (For A/F Sensor)(Bank 1 Sensor1)
DTC P2253 Oxygen Sensor Reference Ground Circuit
High (For A/F Sensor)(Bank 1 Sensor1)
DTC P2255 Oxygen Sensor Reference Ground Circuit
Low (For A/F Sensor)(Bank 2 Sensor1)
DTC P2256 Oxygen Sensor Reference Ground Circuit
High (For A/F Sensor)(Bank 2 Sensor1)
HINT:
S Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
S Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
DI-827
DIAGNOSTICS - ENGINE (2UZ-FE)
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page DI-806.
DTC No. DTC Detection Conditions Trouble Areas
S Case 1:
Condition (a) or (b) continues for 5.0 seconds or more S Open or short in A/F sensor (sensor 1) circuit
(1 trip detection logic): S A/F sensor (sensor 1)
P2238 (a) AF+ voltage 0.5 V or less S A/F sensor heater
P2241 (b) (AF+) - (AF-) = 0.1 V or less S EFI relay
S Case 2: S A/F sensor heater and relay circuits
A/F sensor admittance: Less than 0.022 1/ S ECM
(1 trip detection logic)
S Open or short in A/F sensor (sensor 1) circuit
S A/F sensor (sensor 1)
P2239 AF+ voltage more than 4.5 V for 5.0 seconds or more S A/F sensor heater
P2242 (1 trip detection logic) S EFI relay
S A/F sensor heater and relay circuits
S ECM
S Open or short in A/F sensor (sensor 1) circuit
S A/F sensor (sensor 1)
P2252 AF- voltage 0.5 V or less for 5.0 seconds or more S A/F sensor heater
P2255 (1 trip detection logic) S EFI relay
S A/F sensor heater and relay circuits
S ECM
S Open or short in A/F sensor (sensor 1) circuit
S A/F sensor (sensor 1)
P2253 AF- voltage more than 4.5 V for 5.0 seconds or more S A/F sensor heater
P2256 (1 trip detection logic) S EFI relay
S A/F sensor heater and relay circuits
S ECM
MONITOR DESCRIPTION
The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor
impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the
ECM determines that there is an open or short malfunction in the A/F sensor circuit.
DI-828
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
A/F sensor (Bank 1) open circuit between AF+
and AF-
A/F sensor (Bank 1) short circuit between AF+
P2238
and AF-
A/F sensor (Bank 1) short circuit between AF+
and GND
A/F sensor (Bank 1) short circuit between AF+
P2239
and +B
A/F sensor (Bank 2) open circuit between AF+
and AF-
A/F sensor (Bank 2) short circuit between AF+
P2241
and AF-
Related DTC
R l t d DTCs
A/F sensor (Bank 2) short circuit between AF+
and GND
A/F sensor (Bank 2) short circuit between AF+
P2242
and +B
A/F sensor (Bank 1) short circuit between AF-
P2252
and GND
A/F sensor (Bank 1) short circuit between AF-
P2253
and +B
A/F sensor (Bank 2) short circuit between AF-
P2255
and GND
A/F sensor (Bank 2) short circuit between AF-
P2256
and +B
Required sensors/components A/F sensor
Frequency of operation Once per driving cycle
10 sec.: A/F sensor open circuit between AF+ and AF-
Duration
5 sec.: Others
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
P2238, P2241 (A/F sensor open circuit between AF+ and AF-):
AF+ terminal voltage 0.5 to 4.5 V
AF- terminal voltage 0.5 to 4.5 V
Difference between AF+ terminal and AF-
0.1 to 0.8 V
terminal voltage
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