POOR FUEL ECONOMY [SKYACTIV-D]

Troubleshooting item	POOR FUEL ECONOMY
Description	• Fuel economy is unsatisfactory.
Possible cause	• PCM DTC is stored. • Fuel system malfunction (leak in supply system) • A/C relay malfunction • Fan control module malfunction • ATX malfunction (ATX) • Air cleaner malfunction (non-genuine part installed) • Brake dragging • Tire air pressure malfunction • Turbocharger solenoid valve malfunction • Turbocharger actuator malfunction • HP-EGR control valve malfunction • LP-EGR control valve malfunction • Exhaust shutter valve malfunction • Electric water pump malfunction • Water-cooled charge air cooler malfunction • Generator control malfunction • Poor fuel quality • EGR filter clogged • 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

POOR FUEL ECONOMY

Description

• Fuel economy is unsatisfactory.

Possible cause

• PCM DTC is stored.

• Fuel system malfunction (leak in supply system)

• A/C relay malfunction

• Fan control module malfunction

• ATX malfunction (ATX)

• Air cleaner malfunction (non-genuine part installed)

• Brake dragging

• Tire air pressure malfunction

• Turbocharger solenoid valve malfunction

• Turbocharger actuator malfunction

• HP-EGR control valve malfunction

• LP-EGR control valve malfunction

• Exhaust shutter valve malfunction

• Electric water pump malfunction

• Water-cooled charge air cooler malfunction

• Generator control malfunction

• Poor fuel quality

• EGR filter clogged

• 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	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.
3	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.
4	INSPECT FAN CONTROL MODULE FOR MALFUNCTION • Inspect the applicable part. (See FAN CONTROL MODULE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	ATX: • Go to the next step. MTX: • Go to Step 7.
No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (See COOLING FAN MOTOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
5	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.
6	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.
7	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 Step 17.
No	Install the removed parts correctly, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
8	INSPECT RELATED PART CONDITION • Inspect the following: ― Brake dragging ― Tire air pressure • 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 GENERATOR FOR MALFUNCTION • Inspect the applicable part. (See GENERATOR INSPECTION [SKYACTIV-D 1.8].) • Is the part 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. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
10	INSPECT TURBOCHARGER SOLENOID VALVE FOR MALFUNCTION • Inspect the applicable part. (See TURBOCHARGER SOLENOID VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (See TURBOCHARGER SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
11	INSPECT TURBOCHARGER ACTUATOR • Start the engine and idle it. • Access the PID/DATA monitor item TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Verify the turbocharger actuator operation when the simulation item TURBO_POS_DSD increases from 0 % to 100 %. • Does the TURBO_POS_ACT value change according to the simulation function operation?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
12	INSPECT HP-EGR CONTROL VALVE FOR MALFUNCTION • Inspect the applicable part. (See HP-EGR CONTROL VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
13	INSPECT LP-EGR CONTROL VALVE FOR MALFUNCTION • Inspect the applicable part. (See LP-EGR CONTROL VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification. (See LP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
14	INSPECT EXHAUST SHUTTER VALVE • Switch the ignition off. • Reconnect all disconnected connectors. • Inspect the exhaust shutter valve. (See EXHAUST SHUTTER VALVE INSPECTION [SKYACTIV-D 1.8].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results,, then go to repair completion verification. (See EXHAUST SHUTTER VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) (See EXHAUST SHUTTER VALVE ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
15	DETERMINE IF MALFUNCTION IS DUE TO ELECTRIC WATER PUMP STUCK • Inspect the electric water pump. (See ELECTRIC WATER PUMP INSPECTION [SKYACTIV-D 1.8].) • Is there any malfunction?	Yes	Replace the electric water pump, then go to repair completion verification. (See ELECTRIC WATER PUMP REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
16	INSPECT SEALING OF WATER-COOLED CHARGE AIR COOLANT PASSAGE • Perform the “WATER-COOLED CHARGE AIR COOLER COOLANT LEAKAGE INSPECTION”. (See WATER-COOLED CHARGE AIR COOLER 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	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
No	Go to the next step.
17	INSPECT FOR RESTRICTION IN WATER-COOLED CHARGE AIR COOLER PASSAGE • Inspect restrict in water-cooled charge air cooler coolant passage. • Is there any restriction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
No	Go to the next step.
18	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
19	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 21.
No	Go to the next step.
20	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.
21	INSPECT EGR FILTER • Inspect the EGR filter for clogging. • Is there any malfunction?	Yes	Clean or replace EGR filter. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) Then go to repair completion verification.
No	Go to the next step.
22	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.
23	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	Go to the next step.
No	Adjust the valve timing to the correct timing, then go to repair completion verification.
24	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. • If other driveability symptoms are present: ― Return to the diagnostic index to service additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D].)
No	Repair or replace the malfunctioning part according to the inspection results, 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.

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 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 FAN CONTROL MODULE FOR MALFUNCTION

• Inspect the applicable part.

(See FAN CONTROL MODULE INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

ATX:

• Go to the next step.

MTX:

• Go to Step 7.

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

(See COOLING FAN MOTOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

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 Step 17.

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

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

INSPECT RELATED PART CONDITION

• Inspect the following:

― Brake dragging

― Tire air pressure

• 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 GENERATOR FOR MALFUNCTION

• Inspect the applicable part.

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

• Is the part normal?

Yes

Go to the next step.

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

(See GENERATOR 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

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

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

Go to the next step.

INSPECT TURBOCHARGER ACTUATOR

• Start the engine and idle it.

• Access the PID/DATA monitor item TURBO_POS_ACT and simulation item TURBO_POS_DSD using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

• Verify the turbocharger actuator operation when the simulation item TURBO_POS_DSD increases from 0 % to 100 %.

• Does the TURBO_POS_ACT value change according to the simulation function operation?

Yes

Go to the next step.

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

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

INSPECT HP-EGR CONTROL VALVE FOR MALFUNCTION

• Inspect the applicable part.

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

• Is the part normal?

Yes

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

(See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

INSPECT LP-EGR CONTROL VALVE FOR MALFUNCTION

• Inspect the applicable part.

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

• Is the part normal?

Yes

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

(See LP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

INSPECT EXHAUST SHUTTER VALVE

• Switch the ignition off.

• Reconnect all disconnected connectors.

• Inspect the exhaust shutter valve.

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

• Is there any malfunction?

Yes

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

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

(See EXHAUST SHUTTER VALVE ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

DETERMINE IF MALFUNCTION IS DUE TO ELECTRIC WATER PUMP STUCK

• Inspect the electric water pump.

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

• Is there any malfunction?

Yes

Replace the electric water pump, then go to repair completion verification.

(See ELECTRIC WATER PUMP REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

INSPECT SEALING OF WATER-COOLED CHARGE AIR COOLANT PASSAGE

• Perform the “WATER-COOLED CHARGE AIR COOLER COOLANT LEAKAGE INSPECTION”.

(See WATER-COOLED CHARGE AIR COOLER 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

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

Go to the next step.

INSPECT FOR RESTRICTION IN WATER-COOLED CHARGE AIR COOLER PASSAGE

• Inspect restrict in water-cooled charge air cooler coolant passage.

• Is there any restriction?

Yes

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

Go to the next step.

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 21.

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 EGR FILTER

• Inspect the EGR filter for clogging.

• Is there any malfunction?

Yes

Clean or replace EGR filter.

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

Then go to repair completion verification.

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

Go to the next step.

Adjust the valve timing to the correct timing, then go to repair completion verification.

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.

• If other driveability symptoms are present:

― Return to the diagnostic index to service additional symptoms.

(See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D].)

Repair or replace the malfunctioning part according to the inspection results, 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].)