NO.18 KNOCKING/PINGING-ACCELERATION/CRUISE [SKYACTIV-D 1.5]

18	KNOCKING/PINGING-ACCELERATION/CRUISE
DESCRIPTION	• Knocking sound occurs from the engine.
POSSIBLE CAUSE	• PCM DTC is stored. • Erratic signal to PCM ― LP-EGR control valve opening angle signal ― Turbocharger with variable turbine geometry turbine speed signal ― Actuator position (turbocharger with variable turbine geometry) signal • Fuel injector injection amount correction procedure has not been completed. • 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 ― Improper engine compression ― Large mechanical resistance ― Improper valve timing ― Engine oil malfunction (oil working up or down)

KNOCKING/PINGING-ACCELERATION/CRUISE

DESCRIPTION

• Knocking sound occurs from the engine.

POSSIBLE CAUSE

• PCM DTC is stored.

• Erratic signal to PCM

― LP-EGR control valve opening angle signal

― Turbocharger with variable turbine geometry turbine speed signal

― Actuator position (turbocharger with variable turbine geometry) signal

• Fuel injector injection amount correction procedure has not been completed.

• 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

― Improper engine compression

― Large mechanical resistance

― Improper valve timing

― Engine oil malfunction (oil working up or down)

STEP	INSPECTION	RESULTS	ACTION
1	VERIFY PCM DTC • Retrieve PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 1.5)].)
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 ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].) ― LP_EGR_ACT ― VGTURB_RPM ― VGTURB_ACT • Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION [SKYACTIV-D 1.5].)	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 Step 11. • If there is no malfunction: ― Go to the next step.
No	Go to the next step.
3	VERIFY THAT FUEL INJECTION AMOUNT CORRECTION IS CORRECTLY COMPLETED • Perform the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”. (See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.5].) • Start the engine. • Verify the glow indicator light. • Does the glow indicator light illuminate?	Yes	Re-perform the PCM fuel injection amount adjustment. (Perform the “FUEL INJECTOR DATA RESET” and “FUEL INJECTOR CODE PROGRAM” using the M-MDS.) (See FUEL INJECTOR DATA RESET [SKYACTIV-D 1.5].) (See FUEL INJECTOR CODE PROGRAM [SKYACTIV-D 1.5].) • If a malfunction occurs, change the learning method (use/do not use M-MDS), and re-implement the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”. (See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.5].) Go to Step 11.
No	Go to the next step.
4	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 Step 11.
5	INSPECT FUEL INJECTION RELATED PARTS • Inspect the following parts: ― Common rail (See COMMON RAIL INSPECTION [SKYACTIV-D 1.5].) ― Supply pump (See SUPPLY PUMP INSPECTION [SKYACTIV-D 1.5].) ― Suction control valve (See SUCTION CONTROL VALVE INSPECTION [SKYACTIV-D 1.5].) ― Fuel injector (See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.5].) ― Fuel pressure relief valve (See FUEL PRESSURE RELIEF VALVE INSPECTION [SKYACTIV-D 1.5].) • 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 Step 11.
6	INSPECT FOR MALFUNCTION DUE TO POOR FUEL • Replace the fuel. (See FUEL DRAINING PROCEDURE [SKYACTIV-D 1.5].) • 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
7	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-D 1.5].) • Are compression pressures within specification?	Yes	Go to the next step.
No	Go to Step 10.
8	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 1.5].) • Can bolts be rotated?	Yes	Go to Step 10.
No	Go to the next step.
9	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 1.5].) 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 Step 11. (Large mechanical resistance in engine accessories.)
No	Go to the next step.
10	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING • Inspect the valve timing (timing chain installation condition). (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) • 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.
11	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D 1.5].) • If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)

STEP

INSPECTION

RESULTS

ACTION

VERIFY PCM DTC

• Retrieve PCM DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-D 1.5)].)

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 ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].)

― LP_EGR_ACT

― VGTURB_RPM

― VGTURB_ACT

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

(See PCM INSPECTION [SKYACTIV-D 1.5].)

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 Step 11.

• If there is no malfunction:

― Go to the next step.

Go to the next step.

VERIFY THAT FUEL INJECTION AMOUNT CORRECTION IS CORRECTLY COMPLETED

• Perform the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”.

(See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.5].)

• Start the engine.

• Verify the glow indicator light.

• Does the glow indicator light illuminate?

Yes

Re-perform the PCM fuel injection amount adjustment. (Perform the “FUEL INJECTOR DATA RESET” and “FUEL INJECTOR CODE PROGRAM” using the M-MDS.)

(See FUEL INJECTOR DATA RESET [SKYACTIV-D 1.5].)

(See FUEL INJECTOR CODE PROGRAM [SKYACTIV-D 1.5].)

• If a malfunction occurs, change the learning method (use/do not use M-MDS), and re-implement the “FUEL INJECTOR INJECTION AMOUNT CORRECTION”.

(See FUEL INJECTOR INJECTION AMOUNT CORRECTION [SKYACTIV-D 1.5].)

Go to Step 11.

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 Step 11.

INSPECT FUEL INJECTION RELATED PARTS

• Inspect the following parts:

― Common rail

(See COMMON RAIL INSPECTION [SKYACTIV-D 1.5].)

― Supply pump

(See SUPPLY PUMP INSPECTION [SKYACTIV-D 1.5].)

― Suction control valve

(See SUCTION CONTROL VALVE INSPECTION [SKYACTIV-D 1.5].)

― Fuel injector

(See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.5].)

― Fuel pressure relief valve

(See FUEL PRESSURE RELIEF VALVE INSPECTION [SKYACTIV-D 1.5].)

• Are all items normal?

Yes

Go to the next step.

Repair or replace the malfunctioning part according to the inspection results, then go to Step 11.

INSPECT FOR MALFUNCTION DUE TO POOR FUEL

• Replace the fuel.

(See FUEL DRAINING PROCEDURE [SKYACTIV-D 1.5].)

• 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

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See COMPRESSION INSPECTION [SKYACTIV-D 1.5].)

• Are compression pressures within specification?

Yes

Go to the next step.

Go to Step 10.

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 1.5].)

• Can bolts be rotated?

Yes

Go to Step 10.

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 1.5].)

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 Step 11. (Large mechanical resistance in engine accessories.)

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 1.5].)

• 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.

Verify the test results.

• If normal, return to the diagnostic index to service any additional symptoms.

(See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D 1.5].)

• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.

― If the vehicle is repaired, troubleshooting is completed.

― If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)