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DI-330
DIAGNOSTICS - ENGINE (1GR-FE)
DIDU6-01
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-331
DIAGNOSTICS - ENGINE (1GR-FE)
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page DI-312.
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-332
DIAGNOSTICS - ENGINE (1GR-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 2 driving cycles
Sequence of operation None
DI-333
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-18
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
ECT 5_C (41_F) -
Engine Running
Fuel-cut OFF
Time after fuel-cut OFF 5 sec. -
A/F sensor heater ON
Time after A/F sensor heating 20 sec. -
Battery voltage 11 V -
Ignition switch ON
Time after ignition switch is OFF to ON 5 sec. -
Others:
Battery voltage 11 V -
Ignition switch ON
Time after ignition switch is OFF to ON 5 sec. -
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P2238, P2241 (A/F sensor open circuit between AF+ and AF-):
A/F sensor admittance Bellow 0.022 1/ohm
P2238, P2241 (A/F sensor short circuit between AF+ and GND):
A/F+ terminal voltage 0.5 V or less
P2238, P2241 (A/F sensor short circuit between AF+ and AF-):
Difference between A/F+ terminal and AF- terminal voltage 0.1 V or less
P2239, P2242 (A/F sensor short circuit between AF+ and +B):
A/F+ terminal voltage More than 4.5 V
P2252, P2255 (A/F sensor short circuit between AF- and GND):
A/F- terminal voltage 0.5 V or less
P2253, P225+ (A/F sensor short circuit between AF- and +B):
A/F- terminal voltage More than 4.5 V
WIRING DIAGRAM
Refer to DTC P2195 on page DI-312.
DI-334
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.
(1) Connect a hand-held tester to the DLC3.
(2) Start the engine and turn the tester ON.
(3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
(4) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT
or LEFT button to change the fuel injection volume).
(6) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 (AFS B2S1) and OS2 B1S2
(O2S B2S2)) displayed on the tester.
HINT:
S The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection
volume by 25 %.
S Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Standard:
Tester Display
Injection Volumes Status Voltages
(Sensor)
AFS B1S1 (AFS B2S1)
+25 % Rich Less than 3.0
(A/F)
AFS B1S1 (AFS B2S1)
-12.5 % Lean More than 3.35
(A/F)
O2S B1S2 (O2S B2S2)
+25 % Rich More than 0.55
(HO2)
O2S B1S2 (O2S B2S2)
-12.5 % Lean Less than 0.4
(HO2)
DI-335
DIAGNOSTICS - ENGINE (1GR-FE)
NOTICE:
The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2)
sensor has a maximum output delay of approximately 20 seconds.
S Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs
of both the A/F and HO2 sensors.
S To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD
II / ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2, and press the YES but-
ton and then the ENTER button followed by the F4 button.
A/F Sensor (Sensor 1) HO2 Sensor (Sensor 2) Main Suspected
Case
Output Voltage Output Voltage Trouble Areas
Injection volume Injection volume
+25 % +25 %
-12.5 % -12.5 %
Output voltage Output voltage
1
More than 3.35 V More than 0.55 V
Less than 3.0 V
OK Less than 0.4V
OK
Injection volume Injection volume
A/F sensor
+25 % +25 %
-12.5 % -12.5 %
A/F sensor heater
2 Output voltage Output voltage A/F sensor circuit
Almost More than 0.55 V
NG OK
no reaction Less than 0.4V
Injection volume Injection volume
+25 % +25 %
HO2 sensor
-12.5 % -12.5 % HO2 sensor heater
3 Output voltage Output voltage HO2 sensor circuit
More than 3.35 V Almost
Less than 3.0V OK no reaction NG
Injection volume Injection volume Injector
+25 % +25 % Fuel pressure
-12.5 % -12.5 %
Gas leakage from
4 Output voltage Output voltage exhaust system
Almost Almost (Air-fuel ratio extremely
no reaction
NG no reaction
NG
lean or rich)
HINT:
Read freeze frame data using a hand-held tester. Freeze frame data record the engine condition when mal-
functions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was mov-
ing 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.
DI-336
DIAGNOSTICS - ENGINE (1GR-FE)
1 Check resistance of air-fuel ratio (A/F) sensor heater.
Component Side: PREPARATION:
Disconnect the air-fuel ratio (A/F) sensor connector.
A/F Sensor
CHECK:
Measure resistance between the terminals of the A/F sensor
+B HT connector.
Sensor 1 OK:
AF- AF+ Tester Connection Specified Condition
HT (1) - +B (2) 1.8 to 3.4 at 20_C (68_F)
Front View B17396
HT (1) - AF- (4) 10 k or higher
NG Replace air-fuel ratio (A/F) sensor.
OK
2 Check A/F relay.
PREPARATION:
Remove the A/F relay from the engine room J/B.
CHECK:
Inspect the A/F relay.
OK:
Terminal No. Condition Specified Condition
3-5 Usually 10 k or higher
Apply B+ between
A19288
3-5 Below 1
terminals 1 and 2
NG Replace EFI relay.
OK
DI-337
DIAGNOSTICS - ENGINE (1GR-FE)
3 Check for open and short in harness and connector between ECM and A/F sen-
sor.
Wire Harness Side: PREPARATION:
A/F Sensor Connector (a) Disconnect the A10 or A30 A/F sensor connector.
A10
(b) Turn the ignition switch to ON.
A30 CHECK:
HT +B
(a) Measure the voltage between the +B terminal of the A/F
Sensor 1 sensor connector and body ground.
AF+ AF- OK:
Standard:
Front View A23659 Tester Connections Specified Conditions
+B (2) - Body ground 9 V to 14 V
PREPARATION:
E6 ECM Connector
(a) Turn the ignition switch to OFF.
(b) Disconnect the E6 ECM connector.
CHECK:
(a) Check the resistance.
HA1A HA2A
OK:
Standard (Check for open):
A2A+ A1A+ Tester Connections Specified Conditions
A2A- A1A- A55007
B17415 HT (A10-1) - HA1A (E6-2)
Below 1
HT (A30-1) - HA2A (E6-1)
AF+ (A10-3) - A1A+ (E6-22)
Below 1
AF+ (A30-3) - A2A+ (E6-23)
AF- (A10-4) - A1A- (E6-30)
Below 1
AF- (A30-4) - A2A- (E6-31)
Standard (Check for short):
Tester Connections Specified Conditions
HT (A10-1) or HA1A (E6-2) - Body ground
10 k or higher
HT (A30-1) or HA2A (E6-1) - Body ground
AF+ (A10-3) or A1A+ (E6-22) - Body ground
10 k or higher
AF+ (A30-3) or A2A+ (E6-23) - Body ground
AF- (A10-4) or A1A- (E6-30) - Body ground
10 k or higher
AF- (A30-4) or A2A- (E6-31) - Body ground
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
DI-338
DIAGNOSTICS - ENGINE (1GR-FE)
NG Replace or replace harness or connector.
OK
Replace ECM (See page SF-66).
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