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DTC P1142:00 [PCM (SKYACTIV-D)]

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Outline

System malfunction location	Fuel restriction condition
Detection condition	Note •  The PCM controls the fuel injection amount so that the rotation of the turbocharger with variable turbine geometry does not reach the excess speed range. When the following detection conditions are met, the PCM suppresses the exhaust gas amount by decreasing the fuel injection amount to inhibit the turbocharger with variable turbine geometry from operating at excess speed. The PCM stores P1142:00 as a record indicating that the output restriction has been performed. •  Any one of the following conditions is met: ―  Value of exhaust gas pressure sensor No. 1 is specified value or more*1 ―  Turbocharger with variable turbine geometry operated in excessive speed ―  Turbocharger with variable turbine geometry overboost condition*1 *1: The conditions vary according to the engine speed and the operation condition of the turbocharger with variable turbine geometry.
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 •  Vacuum chamber (built-into cylinder head cover) malfunction •  Turbocharger solenoid valve malfunction •  Check valve malfunction •  Turbocharger with variable turbine geometry malfunction •  Actuator position sensor malfunction •  MAP sensor malfunction •  Exhaust gas pressure sensor No.1 malfunction •  Fuel injector No.1 malfunction •  Fuel injector No.2 malfunction •  Fuel injector No.3 malfunction •  Fuel injector No.4 malfunction •  PCM malfunction
System wiring diagram	•  Not applicable
Connector diagram	•  Not applicable

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	VERIFY RELATED PENDING CODE AND/OR DTC •  Switch the ignition off, then ON (engine off). •  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See DTC INSPECTION.) •  Are any other PENDING CODEs and/or DTCs present?	Yes	If DTC P2104:00, P2106:00 or P2263:00 is stored: •  Go to the next step. If DTC other than P2104:00, P2106:00 or P2263:00 is stored: •  Go to the applicable PENDING CODE or DTC inspection. (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 13.
		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 13. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (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	Repair or replace the malfunctioning location and perform the repair completion verification. (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	Repair or replace the malfunctioning location and perform the repair completion verification. (See EXHAUST GAS PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
12	INSPECT FUEL INJECTOR FOR MALFUNCTION •  Inspect the applicable part. (See FUEL INJECTOR 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 FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
13	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.
14	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.