LACK/LOSS OF POWER-ACCELERATION/CRUISE [SKYACTIV-D]

Troubleshooting item	LACK/LOSS OF POWER-ACCELERATION/CRUISE
Description	• Engine speed increase delays when the accelerator pedal is fully depressed.
Possible cause	• PCM DTC is stored. • Erratic signal to PCM ― MAF sensor (integrated in MAF sensor/IAT sensor No.1) or related circuit malfunction ― IAT sensor No.1 (integrated in MAF sensor/IAT sensor No.1) or related circuit malfunction ― MAP sensor signal malfunction ― Exhaust gas temperature sensor No.1 or related circuit malfunction ― Exhaust gas pressure sensor No.1 or related circuit malfunction ― BARO sensor (integrated in PCM) or related circuit malfunction ― Refrigerant pressure sensor No.1 or related circuit malfunction ― A/F sensor or related circuit malfunction ― Intake shutter valve opening angle signal malfunction ― HP-EGR control valve opening angle signal ― LP-EGR control valve opening angle signal ― Exhaust shutter valve opening signal ― Actuator position (turbocharger) signal • Brake dragging • ATX malfunction (ATX) • Air cleaner malfunction (non-genuine part installed) • A/C relay malfunction • Fuel injection system malfunction ― Fuel leakage from fuel system ― Common rail malfunction ― Supply pump malfunction ― Suction control valve malfunction ― Fuel injector malfunction ― Fuel pressure relief valve malfunction • Poor fuel quality • Mechanical (engine) malfunction ― Large mechanical resistance ― Improper engine compression ― Improper valve timing ― Engine oil malfunction (oil working up or down) Warning • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: ― Always keep sparks and flames away from fuel. Fuel can be easily ignited which could cause serious injury or death, and damage to equipment. ― Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death, and damage to property and facilities. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure", while referring to the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION [SKYACTIV-D 1.8].) ― Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. When installing the fuel hose, always refer to the "AFTER SERVICE PRECAUTION" and perform the "Fuel Hose Installation Procedure". (See AFTER SERVICE PRECAUTION [SKYACTIV-D 1.8].)
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Troubleshooting item

LACK/LOSS OF POWER-ACCELERATION/CRUISE

Description

• Engine speed increase delays when the accelerator pedal is fully depressed.

Possible cause

• PCM DTC is stored.

• Erratic signal to PCM

― MAF sensor (integrated in MAF sensor/IAT sensor No.1) or related circuit malfunction

― IAT sensor No.1 (integrated in MAF sensor/IAT sensor No.1) or related circuit malfunction

― MAP sensor signal malfunction

― Exhaust gas temperature sensor No.1 or related circuit malfunction

― Exhaust gas pressure sensor No.1 or related circuit malfunction

― BARO sensor (integrated in PCM) or related circuit malfunction

― Refrigerant pressure sensor No.1 or related circuit malfunction

― A/F sensor or related circuit malfunction

― Intake shutter valve opening angle signal malfunction

― HP-EGR control valve opening angle signal

― LP-EGR control valve opening angle signal

― Exhaust shutter valve opening signal

― Actuator position (turbocharger) signal

• Brake dragging

• ATX malfunction (ATX)

• Air cleaner malfunction (non-genuine part installed)

• A/C relay malfunction

• Fuel injection system malfunction

― Fuel leakage from fuel system

― Common rail malfunction

― Supply pump malfunction

― Suction control valve malfunction

― Fuel injector malfunction

― Fuel pressure relief valve malfunction

• Poor fuel quality

• Mechanical (engine) malfunction

― Large mechanical resistance

― Improper engine compression

― Improper valve timing

― Engine oil malfunction (oil working up or down)

Warning

• The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

― Always keep sparks and flames away from fuel. Fuel can be easily ignited which could cause serious injury or death, and damage to equipment.

― Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death, and damage to property and facilities. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure", while referring to the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION [SKYACTIV-D 1.8].)

― Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. When installing the fuel hose, always refer to the "AFTER SERVICE PRECAUTION" and perform the "Fuel Hose Installation Procedure". (See AFTER SERVICE PRECAUTION [SKYACTIV-D 1.8].)

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

Step	Inspection	Results	Action
1	VERIFY PCM DTC • Retrieve PCM DTCs using the M-MDS. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D)].)
No	Go to the next step.
2	VERIFY CURRENT INPUT SIGNAL STATUS 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. • Access the following PIDs using the M-MDS: (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-D)].) PCM ― MAF ― IAT11 ― MAP ― MAP_DSD ― EX_PRES ― BARO ― A/C_PRES_BEF_EXP_VLV ― O2 ― INTAKE_SHUT_VLV_POS ― HI_PRES_EGR_VLV_ACT ― LO_PRES_EGR_VLV_ACT ― EX_SHUT_VLV_ACT ― TURBO_POS_ACT • Do the PIDs indicate the correct values under the trouble condition? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-D)].)	Yes	Inspect the related sensor and circuit. • If there is any malfunction: ― Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. • If there is no malfunction: ― Go to the next step.
No	Go to the next step.
3	INSPECT RELATED PART CONDITION • Inspect the following: ― Brake dragging • Is the item normal?	Yes	ATX: • Go to the next step. MTX: • Go to Step 6.
No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
4	VERIFY ATX RELATED DTC • Retrieve TCM DTCs using the M-MDS. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL) (E)].)
No	Go to the next step.
5	VERIFY MALFUNCTION SYMPTOM RELATED TO ATX • Verify the malfunction symptom related to the ATX. (See SYMPTOM TROUBLESHOOTING ITEM TABLE [ET6A-EL, ET6AX-EL].) • Is a malfunction occurring which is applicable to the symptom diagnostic index?	Yes	Go to the applicable symptom troubleshooting. (See SYMPTOM TROUBLESHOOTING ITEM TABLE [ET6A-EL, ET6AX-EL].)
No	Go to the next step.
6	INSPECT AIR CLEANER FOR NON-GENUINE AIR CLEANER INSTALLATION • Remove the non-genuine air cleaner. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) • Verify the symptom. • Does the symptom disappear?	Yes	Explain to the customer that a malfunction occurred due to the installation of a non-genuine air cleaner. • Go to repair completion verification.
No	Install the removed parts correctly, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
7	INSPECT A/C RELAY • Switch the ignition off. • Remove the A/C relay. • Inspect the A/C relay. (See RELAY INSPECTION.) • Is the A/C relay normal?	Yes	Go to the next step.
No	Replace the A/C relay, then go to repair completion verification.
8	INSPECT FOR FUEL LEAKAGE FROM FUEL SYSTEM • Visually inspect the following: ― Fuel leakage from the fuel tank, fuel pump, hose, pipe, fuel injector, supply pump, common rail ― Cracking and damage in fuel hose and pipe ― Clamp installation condition for each hose and pipe ― Fuel pipe securing condition due to deterioration such as rubber of clamp • Are all items normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
9	INSPECT FUEL INJECTION RELATED PARTS • Inspect the following parts: ― Common rail (See COMMON RAIL INSPECTION [SKYACTIV-D 1.8].) ― Supply pump (See SUPPLY PUMP INSPECTION [SKYACTIV-D 1.8].) ― Suction control valve (See SUCTION CONTROL VALVE INSPECTION [SKYACTIV-D 1.8].) ― Fuel injector (See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.8].) ― Fuel pressure relief valve (See FUEL PRESSURE RELIEF VALVE INSPECTION [SKYACTIV-D 1.8].) • Are all items normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
10	INSPECT FOR MALFUNCTION DUE TO POOR FUEL • Replace the fuel. (See FUEL DRAINING PROCEDURE [SKYACTIV-D 1.8].) • Does the symptom disappear?	Yes	Advise the customer as to the change in the fuel used.
No	Remove the accumulated matter in the cylinder head using the following procedure, then go to the next step. • Carbon remover • Overhauling
11	DETERMINE IF MALFUNCTION IS DUE TO EXCESSIVE ENGINE SPEED RESISTANCE • Rotate the crankshaft pulley lock bolt clockwise using a wrench. (See FRONT OIL SEAL REPLACEMENT [SKYACTIV-D 1.8].) • Can bolts be rotated?	Yes	Go to Step 13.
No	Go to the next step.
12	INSPECT FOR MALFUNCTION DUE TO EXCESSIVE MECHANICAL RESISTANCE OF ENGINE ACCESSORIES • Remove all drive belts from engine accessories. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) Caution • Do not run the engine for long periods with the drive belts of engine accessories removed. Otherwise the engine could be damaged from overheating. • Start the engine. • Is cranking possible? (Does the engine start?)	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (Large mechanical resistance in engine accessories.)
No	Go to the next step.
13	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-D 1.8].) • Are compression pressures within specification?	Yes	Go to repair completion verification.
No	Go to the next step.
14	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING • Inspect the valve timing (timing chain installation condition). (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) • Is the valve timing normal?	Yes	Inspect for the following engine internal parts: • Cylinder • Piston ring • Intake valve • Exhaust valve • Such as cylinder head gasket Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
No	Adjust the valve timing to the correct timing, then go to the next step.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
No	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, go to the next step.
Repair completion verification 2	VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING • Verify repair information and verify that there is a new calibration in the PCM. • Is there a new calibration in the PCM?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Step

Inspection

Results

Action

VERIFY PCM DTC

• Retrieve PCM DTCs using the M-MDS.

(See DTC INSPECTION.)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

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

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS

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.

• Access the following PIDs using the M-MDS:

(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-D)].)

PCM

― MAF

― IAT11

― MAP

― MAP_DSD

― EX_PRES

― BARO

― A/C_PRES_BEF_EXP_VLV

― O2

― INTAKE_SHUT_VLV_POS

― HI_PRES_EGR_VLV_ACT

― LO_PRES_EGR_VLV_ACT

― EX_SHUT_VLV_ACT

― TURBO_POS_ACT

• Do the PIDs indicate the correct values under the trouble condition?

(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-D)].)

Yes

Inspect the related sensor and circuit.

• If there is any malfunction:

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

• If there is no malfunction:

― Go to the next step.

Go to the next step.

INSPECT RELATED PART CONDITION

• Inspect the following:

― Brake dragging

• Is the item normal?

Yes

ATX:

• Go to the next step.

MTX:

• Go to Step 6.

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

VERIFY ATX RELATED DTC

• Retrieve TCM DTCs using the M-MDS.

(See DTC INSPECTION.)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL) (E)].)

Go to the next step.

VERIFY MALFUNCTION SYMPTOM RELATED TO ATX

• Verify the malfunction symptom related to the ATX.

(See SYMPTOM TROUBLESHOOTING ITEM TABLE [ET6A-EL, ET6AX-EL].)

• Is a malfunction occurring which is applicable to the symptom diagnostic index?

Yes

Go to the applicable symptom troubleshooting.

(See SYMPTOM TROUBLESHOOTING ITEM TABLE [ET6A-EL, ET6AX-EL].)

Go to the next step.

INSPECT AIR CLEANER FOR NON-GENUINE AIR CLEANER INSTALLATION

• Remove the non-genuine air cleaner.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

• Verify the symptom.

• Does the symptom disappear?

Yes

Explain to the customer that a malfunction occurred due to the installation of a non-genuine air cleaner.

• Go to repair completion verification.

Install the removed parts correctly, then go to the next step.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT A/C RELAY

• Switch the ignition off.

• Remove the A/C relay.

• Inspect the A/C relay.

(See RELAY INSPECTION.)

• Is the A/C relay normal?

Yes

Go to the next step.

Replace the A/C relay, then go to repair completion verification.

INSPECT FOR FUEL LEAKAGE FROM FUEL SYSTEM

• Visually inspect the following:

― Fuel leakage from the fuel tank, fuel pump, hose, pipe, fuel injector, supply pump, common rail

― Cracking and damage in fuel hose and pipe

― Clamp installation condition for each hose and pipe

― Fuel pipe securing condition due to deterioration such as rubber of clamp

• Are all items normal?

Yes

Go to the next step.

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

INSPECT FUEL INJECTION RELATED PARTS

• Inspect the following parts:

― Common rail

(See COMMON RAIL INSPECTION [SKYACTIV-D 1.8].)

― Supply pump

(See SUPPLY PUMP INSPECTION [SKYACTIV-D 1.8].)

― Suction control valve

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

― Fuel injector

(See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.8].)

― Fuel pressure relief valve

(See FUEL PRESSURE RELIEF VALVE INSPECTION [SKYACTIV-D 1.8].)

• Are all items normal?

Yes

Go to the next step.

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

INSPECT FOR MALFUNCTION DUE TO POOR FUEL

• Replace the fuel.

(See FUEL DRAINING PROCEDURE [SKYACTIV-D 1.8].)

• Does the symptom disappear?

Yes

Advise the customer as to the change in the fuel used.

Remove the accumulated matter in the cylinder head using the following procedure, then go to the next step.

• Carbon remover

• Overhauling

DETERMINE IF MALFUNCTION IS DUE TO EXCESSIVE ENGINE SPEED RESISTANCE

• Rotate the crankshaft pulley lock bolt clockwise using a wrench.

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

• Can bolts be rotated?

Yes

Go to Step 13.

Go to the next step.

INSPECT FOR MALFUNCTION DUE TO EXCESSIVE MECHANICAL RESISTANCE OF ENGINE ACCESSORIES

• Remove all drive belts from engine accessories.

(See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Caution

• Do not run the engine for long periods with the drive belts of engine accessories removed. Otherwise the engine could be damaged from overheating.

• Start the engine.

• Is cranking possible? (Does the engine start?)

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (Large mechanical resistance in engine accessories.)

Go to the next step.

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See COMPRESSION INSPECTION [SKYACTIV-D 1.8].)

• Are compression pressures within specification?

Yes

Go to repair completion verification.

Go to the next step.

INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING

• Inspect the valve timing (timing chain installation condition).

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

• Is the valve timing normal?

Yes

Inspect for the following engine internal parts:

• Cylinder

• Piston ring

• Intake valve

• Exhaust valve

• Such as cylinder head gasket

Repair or replace the malfunctioning part according to the inspection results, then go to the next step.

Adjust the valve timing to the correct timing, then go to the next step.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

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

• Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting. (Explain contents of repair to customer)

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, go to the next step.

Repair completion verification 2

VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING

• Verify repair information and verify that there is a new calibration in the PCM.

• Is there a new calibration in the PCM?

Yes

Perform the PCM reprogramming and verify if the malfunction symptom was corrected.

• If the malfunction recurs, replace the PCM.

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

Replace the PCM.

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

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