ECD SYSTEM, Diagnostic DTC:P22AB, P22AC, P22AD, P22AE, P22B2

DTC Code	DTC Name
P22AB	O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 2
P22AC	O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 2
P22AD	O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 2
P22AE	O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 2
P22B2	O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0030.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P22AB	O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 2	The air-fuel ratio is not detected as rich, but the output of the air fuel ratio sensor (for sensor 2) is less than the lower limit value for 2 seconds. (3 trip detection logic)	Open or short in air fuel ratio sensor (for sensor 2) circuit Air fuel ratio sensor (for sensor 2) ECM	Does not come on	DTC stored
P22AC	O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 2	Ground short in air fuel ratio sensor (for sensor 2) circuit for 2 seconds. (3 trip detection logic)	Open or short in air fuel ratio sensor (for sensor 2) circuit Air fuel ratio sensor (for sensor 2) ECM	Does not come on	DTC stored
P22AD	O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 2	Battery short in air fuel ratio sensor (for sensor 2) circuit for 2 seconds. (3 trip detection logic)	Open or short in air fuel ratio sensor (for sensor 2) circuit Air fuel ratio sensor (for sensor 2) ECM	Does not come on	DTC stored
P22AE	O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 2	Air fuel ratio sensor (for sensor 2) is detected if the signal voltage is more than 3 V and the non-linearized value of the air fuel ratio sensor (for sensor 2) signal is greater than 1.5 V or less than -1.3 V for 0.5 seconds. (3 trip detection logic)	Open or short in air fuel ratio sensor (for sensor 2) circuit Air fuel ratio sensor (for sensor 2) ECM	Does not come on	DTC stored
P22B2	O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 2	Air fuel ratio sensor (for sensor 2) is detected if the signal voltage is more than 3 V and the non-linearized value of the air fuel ratio sensor (for sensor 2) signal lies between -0.1 V and 0.1 V for 0.5 seconds. (3 trip detection logic)	Open or short in air fuel ratio sensor (for sensor 2) circuit Air fuel ratio sensor (for sensor 2) ECM	Does not come on	DTC stored

Related Data List
DTC No.	Data List
P22AB P22AC P22AD P22AE P22B2	O2 Sensor Lambda Bank 1 Sensor 2

WIRING DIAGRAM

Refer to DTC P0030.

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs registration and initialization.

Click here
After replacing the air fuel ratio sensor, the ECM needs initialization.

Click here

Tech Tips

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - ECM)

Disconnect the air fuel ratio sensor (for sensor 2) connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
B133-1 (AF2+) - B112-130 (AF2+)	Always	Below 1 Ω
B133-2 (AF2-) - B112-133 (AF2-)	Always	Below 1 Ω
B133-3 (HAF2) - B112-17 (HAF2)	Always	Below 1 Ω
B133-5 (TR2) - B112-131 (TR2)	Always	Below 1 Ω
B133-6 (RE2) - B112-134 (RE2)	Always	Below 1 Ω
B133-1 (AF2+) or B112-130 (AF2+) - Body ground	Always	10 kΩ or higher
B133-2 (AF2-) or B112-133 (AF2-) - Body ground	Always	10 kΩ or higher
B133-3 (HAF2) or B112-17 (HAF2) - Body ground	Always	10 kΩ or higher
B133-5 (TR2) or B112-131 (TR2) - Body ground	Always	10 kΩ or higher
B133-6 (RE2) or B112-134 (RE2) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

OK

REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2)

Replace the air fuel ratio sensor (for sensor 2).

Click here

Perform the O2 sensor learning value reset.

Result

Proceed to
NEXT

NEXT

CHECK WHETHER DTC OUTPUT RECURS

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
Turn the ignition switch off and wait for 60 seconds or more [A].
Perform road test [B].
Repeat [A] and [B] for the number of trips detected.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

Read the DTCs.

Result

Result	Proceed to
DTC P22AB, P22AC, P22AD, P22AE and/or P22B2	A
No DTC output	B

B

END

A

REPLACE ECM

Replace the ECM.

Result

Proceed to
NEXT

NEXT

GO TO STEP 6 Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Result

Proceed to
NEXT

NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
Turn the ignition switch off and wait for 60 seconds or more [A].
Perform road test [B].
Repeat [A] and [B] for the number of trips detected.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

Confirm that the DTC is not output again.

Result

Proceed to
NEXT

NEXT

END