DTC P2A00:00 [PCM (SKYACTIV-D 2.2)]

DTC P2A00:00	A/F sensor circuit: Atmosphere learning error
DETECTION CONDITION	• The difference in the oxygen concentration between atmosphere and the A/F sensor output value is 35% or more for a continuous 5 s. ― A/F sensor feedback correction is actuated ― During non-injection (during deceleration) Diagnostic support note • This is an intermittent monitor (A/F sensor). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Limits engine torque. • Inhibits the automatic diesel particulate filter regeneration control. • Inhibits the manual diesel particulate filter regeneration control. • Inhibits the EGR control.
POSSIBLE CAUSE	• A/F sensor heater malfunction • A/F sensor signal malfunction ― Improper installation of A/F sensor ― Exhaust gas leakage from exhaust system • A/F sensor connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― A/F sensor terminal B and PCM terminal 1H ― A/F sensor terminal D and PCM terminal 1I • PCM connector or terminal malfunction • Open circuit in wiring harness between the following terminals: ― A/F sensor terminal B and PCM terminal 1H ― A/F sensor terminal D and PCM terminal 1I • Engine mechanical system malfunction ― Poor engine compression ― Poor sealing of engine coolant system (leakage of engine coolant into combustion chamber) • A/F sensor malfunction ― A/F sensor deterioration ― A/F sensor element breakage • Engine oil malfunction ― Oil loss through piston ― Oil loss through valves • PCM malfunction

DTC P2A00:00

A/F sensor circuit: Atmosphere learning error

DETECTION CONDITION

• The difference in the oxygen concentration between atmosphere and the A/F sensor output value is 35% or more for a continuous 5 s.

― A/F sensor feedback correction is actuated

― During non-injection (during deceleration)

Diagnostic support note

• This is an intermittent monitor (A/F sensor).

• The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

• Limits engine torque.

• Inhibits the automatic diesel particulate filter regeneration control.

• Inhibits the manual diesel particulate filter regeneration control.

• Inhibits the EGR control.

POSSIBLE CAUSE

• A/F sensor heater malfunction

• A/F sensor signal malfunction

― Improper installation of A/F sensor

― Exhaust gas leakage from exhaust system

• A/F sensor connector or terminal malfunction

• Short to ground in wiring harness between the following terminals:

― A/F sensor terminal B and PCM terminal 1H

― A/F sensor terminal D and PCM terminal 1I

• PCM connector or terminal malfunction

• Open circuit in wiring harness between the following terminals:

― A/F sensor terminal B and PCM terminal 1H

― A/F sensor terminal D and PCM terminal 1I

• Engine mechanical system malfunction

― Poor engine compression

― Poor sealing of engine coolant system (leakage of engine coolant into combustion chamber)

• A/F sensor malfunction

― A/F sensor deterioration

― A/F sensor element breakage

• Engine oil malfunction

― Oil loss through piston

― Oil loss through valves

• PCM malfunction

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	VERIFY OTHER RELATED DTCs • Switch the ignition OFF, and then switch it ON (engine off). • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)]) • Has any DTC other than P2A00:00 been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
No	Go to the next step.
3	INSPECT A/F SENSOR HEATER • Inspect the A/F sensor heater. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 2.2]) • Is the A/F sensor heater normal?	Yes	Go to the next step.
No	Replace the A/F sensor, then go to Step 14. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
4	INSPECT A/F SENSOR • Reconnect all the disconnected connectors. • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 2.2]) • Is the A/F sensor normal?	Yes	Go to Step 7.
No	Go to the next step.
5	VERIFY A/F SENSOR INSTALLATION CONDITION • Verify that there is no looseness in the A/F sensor installation. • Is the A/F sensor installation normal.	Yes	Go to the next step.
No	Install the A/F sensor correctly, then go to Step 14. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
6	INSPECT FOR EXHAUST GAS LEAKAGE FROM EXHAUST SYSTEM • Visually inspect for exhaust gas leakage from exhaust system. • Is the intake air system normal?	Yes	Replace the A/F sensor, then go to Step 14. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
No	Repair or replace the malfunctioning location, then go to Step 14.
7	INSPECT A/F SENSOR CONNECTOR CONNECTION • Switch the ignition OFF. • Disconnect the A/F sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 14.
8	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 14.
9	INSPECT A/F SENSOR CIRCUIT FOR SHORT TO GROUND • Verify that the A/F sensor connector is disconnected. • Inspect for continuity between the following terminals (vehicle wiring harness) and ground. ― A/F sensor terminal B ― A/F sensor terminal D • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • A/F sensor terminal B and PCM terminal 1H • A/F sensor terminal D and PCM terminal 1I If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the wiring harness which is shorted to ground. Go to Step 14.
No	Go to the next step.
10	INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT • Verify that the A/F sensor connector and the PCM connector are disconnected. • Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side). ― A/F sensor terminal B and PCM terminal 1H ― A/F sensor terminal D and PCM terminal 1I • Is there continuity?	Yes	Go to the next step.
No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • A/F sensor terminal B and PCM terminal 1H • A/F sensor terminal D and PCM terminal 1I If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the wiring harness which has an open circuit. Go to Step 14.
11	INSPECT ENGINE COMPRESSION PRESSURE • Inspect the engine compression pressure. (See COMPRESSION INSPECTION [SKYACTIV-D 2.2]) • Is the engine compression pressure normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, then go to Step 14.
12	INSPECT SEALING OF ENGINE (BETWEEN COMBUSTION CHAMBER AND ENGINE COOLANT PASSAGE) • Verify that there is no engine coolant leakage. (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-D 2.2]) • Does the radiator cap tester needle lower even though there is no engine coolant leakage from the radiator hose?	Yes	Engine coolant leakage from the engine complete (between combustion chamber and engine coolant passage) can be considered. • Verify gasket and cylinder head condition. If there is a malfunction ― Repair or replace the malfunctioning location, then go to Step 14.
No	Go to the next step.
13	Inspect for malfunction due to internal engine wear, damage • Inspect the following internal engine parts. ― Cylinder ― Piston ring ― Intake/exhaust valve ― Cylinder head gasket • Are all the parts normal?	Yes	The internal engine parts are normal. • Go to the next step.
No	Repair or replace the malfunctioning location, then go to the next step.
14	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all disconnected connectors and hoses. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)]) • Start the engine and warm it up. • Stop all electrical loads. (Such as A/C, headlights, blower fan, rear window defroster) Warning • To prevent an accident, work with another person when the vehicle is being driven (one person drives vehicle, other person operates M-MDS). • Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured. • Drive the vehicle for 5 min while the temperature detected by exhaust gas pressure sensor No.1 is 240 °C {464 °F} or more (vehicle speed 60 km/h {37 mph} or more and in 3rd gear or higher). • Release the accelerator pedal and decelerate using engine braking. • Without turning off the engine, accelerate to 60 km/h {37 mph} or more, and after 60 s of driving, release the accelerator pedal and decelerate using engine braking. Do this 10 times repeatedly. ^*1: Standard can be verified by displaying PIDs using M-MDS. • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)]) • Has DTC P2A00:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
No	Go to the next step.
15	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

• Recording can be facilitated using the screen capture function of the PC.

• Record the freeze frame data/snap shot data.

—

Go to the next step.

VERIFY OTHER RELATED DTCs

• Switch the ignition OFF, and then switch it ON (engine off).

• Display the DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)])

• Has any DTC other than P2A00:00 been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)])

Go to the next step.

INSPECT A/F SENSOR HEATER

• Inspect the A/F sensor heater.

(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 2.2])

• Is the A/F sensor heater normal?

Yes

Go to the next step.

Replace the A/F sensor, then go to Step 14.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

INSPECT A/F SENSOR

• Reconnect all the disconnected connectors.

• Inspect the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 2.2])

• Is the A/F sensor normal?

Yes

Go to Step 7.

Go to the next step.

VERIFY A/F SENSOR INSTALLATION CONDITION

• Verify that there is no looseness in the A/F sensor installation.

• Is the A/F sensor installation normal.

Yes

Go to the next step.

Install the A/F sensor correctly, then go to Step 14.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

INSPECT FOR EXHAUST GAS LEAKAGE FROM EXHAUST SYSTEM

• Visually inspect for exhaust gas leakage from exhaust system.

• Is the intake air system normal?

Yes

Replace the A/F sensor, then go to Step 14.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

Repair or replace the malfunctioning location, then go to Step 14.

INSPECT A/F SENSOR CONNECTOR CONNECTION

• Switch the ignition OFF.

• Disconnect the A/F sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 14.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 14.

INSPECT A/F SENSOR CIRCUIT FOR SHORT TO GROUND

• Verify that the A/F sensor connector is disconnected.

• Inspect for continuity between the following terminals (vehicle wiring harness) and ground.

― A/F sensor terminal B

― A/F sensor terminal D

• Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

• A/F sensor terminal B and PCM terminal 1H

• A/F sensor terminal D and PCM terminal 1I

If there is a common connector:

― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.

― Repair or replace the malfunctioning location.

If there is no common connector:

― Repair or replace the wiring harness which is shorted to ground.

Go to Step 14.

Go to the next step.

INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT

• Verify that the A/F sensor connector and the PCM connector are disconnected.

• Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side).

― A/F sensor terminal B and PCM terminal 1H

― A/F sensor terminal D and PCM terminal 1I

• Is there continuity?

Yes

Go to the next step.

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

• A/F sensor terminal B and PCM terminal 1H

• A/F sensor terminal D and PCM terminal 1I

If there is a common connector:

― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.

― Repair or replace the malfunctioning location.

If there is no common connector:

― Repair or replace the wiring harness which has an open circuit.

Go to Step 14.

INSPECT ENGINE COMPRESSION PRESSURE

• Inspect the engine compression pressure.

(See COMPRESSION INSPECTION [SKYACTIV-D 2.2])

• Is the engine compression pressure normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, then go to Step 14.

INSPECT SEALING OF ENGINE (BETWEEN COMBUSTION CHAMBER AND ENGINE COOLANT PASSAGE)

• Verify that there is no engine coolant leakage.

(See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-D 2.2])

• Does the radiator cap tester needle lower even though there is no engine coolant leakage from the radiator hose?

Yes

Engine coolant leakage from the engine complete (between combustion chamber and engine coolant passage) can be considered.

• Verify gasket and cylinder head condition.

If there is a malfunction

― Repair or replace the malfunctioning location, then go to Step 14.

Go to the next step.

Inspect for malfunction due to internal engine wear, damage

• Inspect the following internal engine parts.

― Cylinder

― Piston ring

― Intake/exhaust valve

― Cylinder head gasket

• Are all the parts normal?

Yes

The internal engine parts are normal.

• Go to the next step.

Repair or replace the malfunctioning location, then go to the next step.

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

• Reconnect all disconnected connectors and hoses.

• Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.

(See CLEARING DTC [PCM (SKYACTIV-D 2.2)])

• Start the engine and warm it up.

• Stop all electrical loads. (Such as A/C, headlights, blower fan, rear window defroster)

Warning

• To prevent an accident, work with another person when the vehicle is being driven (one person drives vehicle, other person operates M-MDS).

• Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured.

• Drive the vehicle for 5 min while the temperature detected by exhaust gas pressure sensor No.1 is 240 °C {464 °F} or more (vehicle speed 60 km/h {37 mph} or more and in 3rd gear or higher).

• Release the accelerator pedal and decelerate using engine braking.

• Without turning off the engine, accelerate to 60 km/h {37 mph} or more, and after 60 s of driving, release the accelerator pedal and decelerate using engine braking. Do this 10 times repeatedly.

^*1: Standard can be verified by displaying PIDs using M-MDS.

• Display the DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)])

• Has DTC P2A00:00 been recorded?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

Go to the next step.

VERIFY OTHER DTCs

• Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)])

DTC troubleshooting completed.