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

id0102t5506600

Outline

System malfunction location

Atmosphere learning malfunction in A/F sensor circuit

Detection condition

•  With the following conditions met, a condition has continued for 5 s in which the A/F sensor output value is deviated from the preset standard value by 36.5 % or more

Preconditions

―  Battery voltage: 8—20 V

―  Engine speed: 800 rpm or more

―  A/F sensor feedback correction is actuated

Fail-safe

•  PCM restricts engine torque.

•  Limits the maximum engine speed.

•  Inhibits the DENOx/DESOx control.

•  Inhibits the diesel particulate filter regeneration control.

•  Inhibits the EGR control.

Possible cause

•  A/F sensor heater malfunction

•  Erratic signal from A/F sensor

―  A/F sensor loose

―  Exhaust system leakage

―  A/F sensor deterioration

•  A/F sensor connector or terminals malfunction

•  PCM connector or terminals malfunction

•  Short to ground in any of the following A/F sensor circuits.

―  Signal (+) circuit

―  Signal (-) circuit

•  Open circuit in any of the following A/F sensor circuits.

―  Signal (+) circuit

―  Signal (-) circuit

•  Engine malfunction

―  Insufficient engine compression

―  Engine coolant leakage to combustion chamber

•  Engine oil malfunction

―  Oil going up

―  Oil going down

•  PCM malfunction

System malfunction location	Atmosphere learning malfunction in A/F sensor circuit
Detection condition	• With the following conditions met, a condition has continued for 5 s in which the A/F sensor output value is deviated from the preset standard value by 36.5 % or more Preconditions ― Battery voltage: 8—20 V ― Engine speed: 800 rpm or more ― A/F sensor feedback correction is actuated
Fail-safe	• PCM restricts engine torque. • Limits the maximum engine speed. • Inhibits the DENOx/DESOx control. • Inhibits the diesel particulate filter regeneration control. • Inhibits the EGR control.
Possible cause	• A/F sensor heater malfunction • Erratic signal from A/F sensor ― A/F sensor loose ― Exhaust system leakage ― A/F sensor deterioration • A/F sensor connector or terminals malfunction • PCM connector or terminals malfunction • Short to ground in any of the following A/F sensor circuits. ― Signal (+) circuit ― Signal (-) circuit • Open circuit in any of the following A/F sensor circuits. ― Signal (+) circuit ― Signal (-) circuit • Engine malfunction ― Insufficient engine compression ― Engine coolant leakage to combustion chamber • Engine oil malfunction ― Oil going up ― Oil going down • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

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

•  Record the freeze frame data/snapshot data.

Note

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

—

Go to the next step.

2

VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY

•  Verify related Service Bulletins, on-line repair information, or Service Information availability.

•  Is any related Information available?

Yes

Perform repair or diagnosis according to the available information.

•  If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

INSPECT FOR OTHER RELATED DTCs

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

No

Go to the next step.

4

INSPECT A/F SENSOR HEATER FOR MALFUNCTION

•  Inspect the applicable part.
(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 1.8].)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

5

INSPECT A/F SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 1.8].)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

6

INSPECT INSTALLATION OF A/F SENSOR

•  Inspect installation of A/F sensor.

•  Is the A/F sensor installed securely?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

7

INSPECT EXHAUST SYSTEM FOR LEAKAGE

•  Visually inspect for exhaust leakage in the exhaust system.

•  Is there any leakage?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

8

INSPECT A/F SENSOR CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

9

INSPECT PCM CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

10

INSPECT A/F SENSOR SIGNAL (+) CIRCUIT AND SIGNAL CIRCUIT (-) FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

11

INSPECT A/F SENSOR SIGNAL (+) CIRCUIT AND SIGNAL CIRCUIT (-) FOR OPEN CIRCUIT

•  Inspect the applicable circuit for open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

12

INSPECT ENGINE COMPRESSION

•  Inspect the engine compression.
(See COMPRESSION INSPECTION [SKYACTIV-D 1.8].)

•  Are compression pressures within specification?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.

13

INSPECT SEALING OF ENGINE COOLANT PASSAGE

•  Perform the “ENGINE COOLANT LEAKAGE INSPECTION”.
(See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-D 1.8].)

•  Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?

Yes

Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred.

•  Verify the conditions of the gasket and the cylinder head.

―  If there is any malfunction:

•  Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.

No

Go to the next step.

14

INSPECT FOR MALFUNCTION DUE TO INTERNAL ENGINE WEAR, DAMAGE

•  Inspect for the following engine internal parts:

―  Cylinder

―  Piston ring

―  Intake valve

―  Exhaust valve

―  Such as cylinder head gasket

•  Are all items normal?

Yes

Engine internal parts are normal.

•  Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

―  Start the engine and warm it up completely.

―  Drive the vehicle on a flat road surface 5 times under the following conditions.

1.  Drive the vehicle in third gear at 50 km/h {31 mph} while maintaining the speed for 30 s.

2.  Stop the vehicle and idle the engine.

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D)].)
3		No	Go to the next step.
4	INSPECT A/F SENSOR HEATER FOR MALFUNCTION • Inspect the applicable part. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
5	INSPECT A/F SENSOR FOR MALFUNCTION • Inspect the applicable part. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
6	INSPECT INSTALLATION OF A/F SENSOR • Inspect installation of A/F sensor. • Is the A/F sensor installed securely?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
7	INSPECT EXHAUST SYSTEM FOR LEAKAGE • Visually inspect for exhaust leakage in the exhaust system. • Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
8	INSPECT A/F SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT A/F SENSOR SIGNAL (+) CIRCUIT AND SIGNAL CIRCUIT (-) FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT A/F SENSOR SIGNAL (+) CIRCUIT AND SIGNAL CIRCUIT (-) FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-D 1.8].) • Are compression pressures within specification?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
13	INSPECT SEALING OF ENGINE COOLANT PASSAGE • Perform the “ENGINE COOLANT LEAKAGE INSPECTION”. (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-D 1.8].) • Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?	Yes	Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred. • Verify the conditions of the gasket and the cylinder head. ― If there is any malfunction: • Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
13		No	Go to the next step.
14	INSPECT FOR MALFUNCTION DUE TO INTERNAL ENGINE WEAR, DAMAGE • Inspect for the following engine internal parts: ― Cylinder ― Piston ring ― Intake valve ― Exhaust valve ― Such as cylinder head gasket • Are all items normal?	Yes	Engine internal parts are normal. • Go to the next step.
14		No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Start the engine and warm it up completely. ― Drive the vehicle on a flat road surface 5 times under the following conditions. 1. Drive the vehicle in third gear at 50 km/h {31 mph} while maintaining the speed for 30 s. 2. Stop the vehicle and idle the engine. • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.