DTC P2104:00 [PCM (SKYACTIV-D)]

System malfunction location	Intake shutter valve control system: Idle air control
Detection condition	• When all of the following conditions are met, the PCM determines that the exhaust gas pressure or boost pressure is the estimated value or more. ― Ignition switched ON (engine on). ― Shift position: except P or N position (ATX) ― Shift lever position is neutral (MTX)
Fail-safe	• Not applicable
Possible cause	• Vacuum piping malfunction ― Power brake unit—Vacuum pump ― Vacuum pump—Check valve ― Check valve—Vacuum chamber ― Vacuum chamber—Turbocharger solenoid valve ― Turbocharger solenoid valve—Turbocharger actuator • Oil suction into combustion chamber • Fuel injector No.1 malfunction • Fuel injector No.2 malfunction • Fuel injector No.3 malfunction • Fuel injector No.4 malfunction • Turbocharger with variable turbine geometry malfunction • Actuator position sensor malfunction • Turbocharger solenoid valve malfunction • Exhaust gas pressure sensor No.1 malfunction • MAP sensor malfunction • Vacuum chamber (built-into cylinder head cover) malfunction • Check valve malfunction • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

System malfunction location

Intake shutter valve control system: Idle air control

Detection condition

• When all of the following conditions are met, the PCM determines that the exhaust gas pressure or boost pressure is the estimated value or more.

― Ignition switched ON (engine on).

― Shift position: except P or N position (ATX)

― Shift lever position is neutral (MTX)

Fail-safe

• Not applicable

Possible cause

• Vacuum piping malfunction

― Power brake unit—Vacuum pump

― Vacuum pump—Check valve

― Check valve—Vacuum chamber

― Vacuum chamber—Turbocharger solenoid valve

― Turbocharger solenoid valve—Turbocharger actuator

• Oil suction into combustion chamber

• Fuel injector No.1 malfunction

• Fuel injector No.2 malfunction

• Fuel injector No.3 malfunction

• Fuel injector No.4 malfunction

• Turbocharger with variable turbine geometry malfunction

• Actuator position sensor malfunction

• Turbocharger solenoid valve malfunction

• Exhaust gas pressure sensor No.1 malfunction

• MAP sensor malfunction

• Vacuum chamber (built-into cylinder head cover) malfunction

• Check valve malfunction

• PCM malfunction

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

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	DETERMINE IF MALFUNCTION IS CAUSED BY TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY • Switch the ignition off. • Switch the ignition ON (engine on). • Display PID TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS. (See DTC INSPECTION.) • Operate the turbocharger with variable geometry using simulation item TURBO_POS_DSD. • Does PID TURBO_POS_ACT change according to the simulation operation?	Yes	Go to Step 12.
No	Go to the next step.
5	INSPECT VACUUM PIPING • Inspect vacuum piping at the following: (See INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [SKYACTIV-D 1.8].) (See CONVENTIONAL BRAKE SYSTEM LOCATION INDEX [(E)].) ― Power brake unit—Vacuum pump ― Vacuum pump—Check valve ― Check valve—Vacuum chamber ― Vacuum chamber—Turbocharger solenoid valve ― Turbocharger solenoid valve—Turbocharger actuator • Is there hose leakage or damage in the vacuum piping?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 9.
No	Go to the next step.
6	INSPECT VACUUM CHAMBER FOR MALFUNCTION • Inspect the applicable part. (See VACUUM CHAMBER INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Replace the cylinder head cover, then go to Step 9. (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
7	INSPECT TURBOCHARGER SOLENOID VALVE FOR MALFUNCTION • Inspect the applicable part. (See TURBOCHARGER SOLENOID VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Replace the turbocharger solenoid valve, then go to Step 9. (See TURBOCHARGER SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
8	INSPECT CHECK VALVE FOR MALFUNCTION • Inspect the applicable part. (See CHECK VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Replace the turbocharger with variable turbine geometry, then go to Step 12. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Replace the check valve, then go to the next step. (See CHECK VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
9	DETERMINE IF MALFUNCTION IS CAUSED BY TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY • Switch the ignition off. • Switch the ignition ON (engine on). • Display PID TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS. (See DTC INSPECTION.) • Operate the turbocharger with variable geometry using simulation item TURBO_POS_DSD. • Does PID TURBO_POS_ACT change according to the simulation operation?	Yes	Go to the next step.
No	Replace the turbocharger with variable turbine geometry, then go to the next step. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
10	INSPECT MAP SENSOR FOR MALFUNCTION • Inspect the applicable part. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Replace the MAP sensor/boost air temperature sensor, then go to the next step. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/BOOST AIR TEMPERATURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
11	INSPECT EXHAUST GAS PRESSURE SENSOR No.1 FOR MALFUNCTION • Inspect the applicable part. (See EXHAUST GAS PRESSURE SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Replace the exhaust gas pressure sensor No.1, then go to the next step. (See EXHAUST GAS PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
12	PERFORM COMPULSORY DIESEL PARTICULATE FILTER REGENERATION AND BURN OUT ENGINE OIL IN DIESEL PARTICULATE FILTER • Perform the “COMPULSORY DIESEL PARTICULATE FILTER REGENERATION”. (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 1.8].) Note • When a DTC is stored, compulsory diesel particulate filter regeneration may be performed by the PCM control. (See DTC INSPECTION.) ― For DTCs P242F:00, the "COMPULSORY DIESEL PARTICULATE FILTER REGENERATION" will only be blocked if an excessive amount of soot is in the diesel particulate filter. • Compulsory diesel particulate filter regeneration is performed after performing the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D)].)	—	Go to the next step.
13	INSPECT ENGINE OIL LEVEL • Inspect the engine oil level. (See VACUUM CHAMBER INSPECTION [SKYACTIV-D 1.8].) • Is the engine oil amount above X line on the dipstick?	Yes	Replace the engine oil. (See ENGINE OIL REPLACEMENT [SKYACTIV-D 1.8].) Perform the “ENGINE OIL DATA RESET”. (See ENGINE OIL DATA RESET [SKYACTIV-D 1.8].) Go to the next step.
No	Go to the next step.
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. ― Perform the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”. (See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.8].) ― Start the engine and warm it up completely. Caution • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. ― Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition. • 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

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.

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.

Go to the next step.

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)].)

Go to the next step.

DETERMINE IF MALFUNCTION IS CAUSED BY TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY

• Switch the ignition off.

• Switch the ignition ON (engine on).

• Display PID TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS.

(See DTC INSPECTION.)

• Operate the turbocharger with variable geometry using simulation item TURBO_POS_DSD.

• Does PID TURBO_POS_ACT change according to the simulation operation?

Yes

Go to Step 12.

Go to the next step.

INSPECT VACUUM PIPING

• Inspect vacuum piping at the following:

(See INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [SKYACTIV-D 1.8].)

(See CONVENTIONAL BRAKE SYSTEM LOCATION INDEX [(E)].)

― Power brake unit—Vacuum pump

― Vacuum pump—Check valve

― Check valve—Vacuum chamber

― Vacuum chamber—Turbocharger solenoid valve

― Turbocharger solenoid valve—Turbocharger actuator

• Is there hose leakage or damage in the vacuum piping?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 9.

Go to the next step.

INSPECT VACUUM CHAMBER FOR MALFUNCTION

• Inspect the applicable part.

(See VACUUM CHAMBER INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Replace the cylinder head cover, then go to Step 9.

(See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT TURBOCHARGER SOLENOID VALVE FOR MALFUNCTION

• Inspect the applicable part.

(See TURBOCHARGER SOLENOID VALVE INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Replace the turbocharger solenoid valve, then go to Step 9.

(See TURBOCHARGER SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT CHECK VALVE FOR MALFUNCTION

• Inspect the applicable part.

(See CHECK VALVE INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Replace the turbocharger with variable turbine geometry, then go to Step 12.

(See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Replace the check valve, then go to the next step.

(See CHECK VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

DETERMINE IF MALFUNCTION IS CAUSED BY TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY

• Switch the ignition off.

• Switch the ignition ON (engine on).

• Display PID TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS.

(See DTC INSPECTION.)

• Operate the turbocharger with variable geometry using simulation item TURBO_POS_DSD.

• Does PID TURBO_POS_ACT change according to the simulation operation?

Yes

Go to the next step.

Replace the turbocharger with variable turbine geometry, then go to the next step.

(See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT MAP SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Replace the MAP sensor/boost air temperature sensor, then go to the next step.

(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/BOOST AIR TEMPERATURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT EXHAUST GAS PRESSURE SENSOR No.1 FOR MALFUNCTION

• Inspect the applicable part.

(See EXHAUST GAS PRESSURE SENSOR INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Replace the exhaust gas pressure sensor No.1, then go to the next step.

(See EXHAUST GAS PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

PERFORM COMPULSORY DIESEL PARTICULATE FILTER REGENERATION AND BURN OUT ENGINE OIL IN DIESEL PARTICULATE FILTER

• Perform the “COMPULSORY DIESEL PARTICULATE FILTER REGENERATION”.

(See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 1.8].)

Note

• When a DTC is stored, compulsory diesel particulate filter regeneration may be performed by the PCM control.

(See DTC INSPECTION.)

― For DTCs P242F:00, the "COMPULSORY DIESEL PARTICULATE FILTER REGENERATION" will only be blocked if an excessive amount of soot is in the diesel particulate filter.

• Compulsory diesel particulate filter regeneration is performed after performing the applicable DTC troubleshooting.

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

—

Go to the next step.

INSPECT ENGINE OIL LEVEL

• Inspect the engine oil level.

(See VACUUM CHAMBER INSPECTION [SKYACTIV-D 1.8].)

• Is the engine oil amount above X line on the dipstick?

Yes

Replace the engine oil.

(See ENGINE OIL REPLACEMENT [SKYACTIV-D 1.8].)

Perform the “ENGINE OIL DATA RESET”.

(See ENGINE OIL DATA RESET [SKYACTIV-D 1.8].)

Go to the next step.

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.

― Perform the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”.

(See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.8].)

― Start the engine and warm it up completely.

Caution

• While performing this step, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

― Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition.

• 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].)

Go to the next step.

Repair completion verification 2