GDI -Troubleshooting 13A-174 Inspection procedure 7 Unstable idling (Rough idling, hunting) Probable cause The cause is probably a malfunction of the ignition system, air/fuel ratio control system, electronic controlled throttle valve system, compression pressure, etc. As many causes can be suspected, diagnose from easier items.DMalfunction of the ignition system DMalfunction of the air/fuel ratio control system DMalfunction of the electronic-controlled throttle valve system DPoor compression DAir sucking into the air intake system OK Check that air is sucked in the air intake system. DBroken intake manifold gasket DDamaged vacuum hose DDamaged air intake hoseOK To the nextpage OK MUT- IIData list 11 Oxygen sensor (Refer to P.13A-198.) OK: 0 - 400 mV and 600 - 1,000 mV alternates when the engine is idling(wait for 2 minutes after the en- gine is started).NGMeasure fuel high-pressure between the fuel pump (high pressure) and injector. (Refer to P.13A-222.) OK MUT- IIData list 11 Oxygen sensor (Refer to P.13A-198.) OK: 600 - 1,000 mV when theengine is suddenlyracedNG11 Oxygen sensor system check (Refer to P. 13A-131, code No.11.) OK MUT- IIActuator Test 08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system (Refer to P.13A-197, Inspection procedure 36.) OK MUT- IIData list 21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer to P.13A-138, code No.21.) OK MUT- IIData list 25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system (Refer to P.13A-145, code No.25.) OK MUT- IIData list 13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system (Refer to P.13A-135, code No.13.) NO MUT- IIData list 26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system (Refer to P.13A-192, Inspection procedure 28.) OK Does theidlingspeed fluctuate excessively?YESDClean around the throttle valve. (Refer to P.13A-220) DAdjust the throttle position sensor (Refer to P.13A-220.) NO MUT- IIData list 79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system (Refer to P.13A-162, code No.92.) NO MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes. www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-175 OK NG Air is sucked in the air intake system, or EGR gas leaks. DBroken intake manifold gasket DDamaged air intake hose DDamaged vacuum hose DFaulty EGR valve seat Check the trouble symptoms. OK Check the following items in that order. DCheck the sparkplug DCheck the exhaust gas emission control system DCheck the EGR control system DCheck the compression pressure DCheck if foreign materials (water, kerosine,etc.) got into fuel. OK Check ignition coil spark for each cylinder. 1. Remove the ignition coil. 2. Install a new sparkplug to the removed ignitioncoil. 3. Disconnect the injector intermediate connector. Caution Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured. 4. Earth the sparkplug electrodesecurely. 5. Check that the sparkplug igniteswhen theengine is cranked.NGReplace the ignition coil. Clean around the throttle valve. (Refer to P.13A-220.) OK Check the ignition timing. (Refer to GROUP 11A - Engine Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are properly installed. OK MUT- IIData list 68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection procedure 35.) OK MUT- IIData list 14 Throttle position sensor (2nd channel) After warming-up, let theengine run at idlingwith no load. OK: When idling, 3,900 - 4,800 mVNGDClean around the throttle valve. (Refer to P.13A-220) DAdjust the throttle position sensor (Refer to P.13A-220.) OK MUT- IIData list 67 Stoplampswitch (Refer to P.13A-198.)NGCheck the stoplampswitch system (Refer to P.13A-195, Inspection procedure 32.) OK MUT- IIData list 28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system (Refer to P.13A-194, Inspection procedure 31.) OK MUT- IIData list 27 Power steering oil pressure switch (Refer to P.13A-198.)NGCheck the power steering oil pressure switch system (Refer to P.13A-194, Inspection procedure 30.) From the previouspage OK MUT- IIData list 31 Small lampswitch (Refer to P.13A-198.)NGCheck the smalllampswitch system (Refer to P.13A-195, Inspection procedure 33.) www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-176 Inspection procedure 8 Idling speed is high or low (Improper idling speed) Probable cause The cause is probably that the intake airamount during idling is too great or too small.DMalfunction of the electronic-controlled throttle valve system DMalfunction of the throttle body OK DClean around the throttle valve. (Refer to P.13A-220.) DAdjust the throttle position sensor (Refer to P.13A-220.) OK MUT- IIData list 67 Stoplampswitch (Refer to P.13A-198.)NGCheck the stoplampswitch system (Refer to P.13A-195, Inspection procedure 32.) OK MUT- IIData list 28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system (Refer to P.13A-194, Inspection procedure 31.) OK MUT- IIData list 21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer to P.13A-138, code No.21.) OK MUT- IIData list 26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system (Refer to P.13A-192, Inspection procedure 28.) OK MUT- IIActuator Test 08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system (Refer to P.13A-197, Inspection procedure 36.) MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. NO MUT- IIData list 79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system (Refer to P.13A-162, code No.92.) www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-177 Inspection procedure 9 When the engine is cold, it stalls at idling. (Die out) Probable cause In such cases as the above, the cause is probably that the air/fuel mixture is inappropriate when theengine iscold, or that the intake air volume is insufficient.DMalfunction of the electronic-controlled throttle valve system DMalfunction of the throttle body OK NG Replace the injector. Check the trouble symptoms. Check the following items in that order. DCheck the sparkplug DCheck the compression pressure DCheck theengine oilviscosity. OK Check ignition coil spark for each cylinder. 1. Remove the ignition coil. 2. Install a new sparkplug to the removed ignitioncoil. 3. Disconnect the injector intermediate connector. Caution Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured. 4. Earth the sparkplug electrodesecurely. 5. Check that the sparkplug igniteswhen theengine is cranked.NGReplace the ignition coil. OK Check the ignition timing. (Refer to GROUP 11A - Engine Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are properly installed. NO Measure fuel high-pressure between the fuel pump (high pressure) and injector. (Refer to P.13A-222.) OK Does theenginestall right after the acceleratorpedal is released?YESDClean around the throttle valve. (Refer to P.13A-220.) DAdjust the throttle position sensor. (Refer to P.13A-220.) OK MUT- IIData list 68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system. (Refer to P.13A-196, Inspection procedure 35.) OK MUT- IIData list 21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system. (Refer to P.13A-138, code No.21.) OK MUT- IIData list 26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system. (Refer to P.13A-192, Inspection procedure 28.) NO MUT- IIData list 14 Throttle position sensor (2nd channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system. (Refer to P.13A-162, code No.92.) NO Is engine-idling stable after the warming-up?YESCheck the unstableidling (rough, hunting). (Refer to P.13A-174, Inspection procedure 7.) NO MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes. www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-178 Inspection procedure 10 When the engine becomes hot, it stalls at idling. (Die out) Probable cause In such cases as the above, the cause is probably that ignition system, air/fuel mixture, electronic-controlled throttle valve system, compression pressure is defective. In addition, if the engine suddenlystalls, the cause may also be a defective connector contact.DMalfunction of the ignition system DMalfunction of the air/fuel ratio control system DMalfunction of the electronic-controlled throttle valve system DMalfunction of the throttle body DImproper connector contact DDrawing air into intake system OK Check that air is sucked in the air intake system. DBroken intake manifoldgasket DDamaged vacuum hose DDamaged air intake hoseOK To the nextpage OK MUT- IIData list 11 Oxygen sensor (Refer to P.13A-198.) OK 0 - 400 mV and 600 - 1,000 mV alternates when the engine is idling(wait for 2 minutes after the en- gine is started).NGMeasure fuel high-pressure between the fuel pump (high pressure) and injector. (Refer to P.13A-222.) OK MUT- IIData list 11 Oxygen sensor (Refer to P.13A-198.) OK 600 - 1,000 mV when theengine is suddenlyraced.NGCheck Oxygen sensor system (Refer to P.13A-131, code No.11.) OK MUT- IIData list 21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system. (Refer to P.13A-138, code No.21.) OK MUT- IIData list 25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system. (Refer to P.13A-145, code No.25.) OK MUT- IIData list 13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system. (Refer to P.13A-135, code No.13.) YES MUT- IIData list 26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system. (Refer to P.13A-192, Inspection procedure 28.) NO MUT- IIData list 79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system. (Refer to P.13A-162, code No.92.) NO MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes. OK Does theenginestall easilyagain?NOWhile carrying out an intermittent malfunction simulation test (Refer to GROUP 00 - Points to Note for Intermittent Malfunctions.), check for sudden changes in the signals shown below. DCrankanglesensor signal DInjector activating signal DLow pressure fuelpumpdrive signal DAir flow sensor DPrimary ignition signal DEngine-A/T-ECU power supply voltage www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-179 OK Check the following items in that order. DCheck the sparkplug DCheck the compression pressure DCheck if foreign materials (water, kerosine,etc.) got into fuel. OK MUT- IIData list 68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection procedure 35.) OK MUT- IIData list 28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system (Refer to P.13A-194, Inspection procedure 31.) OK MUT- IIData list 27 Power steering oil pressure switch (Refer to P.13A-198.)NGCheck the power steering oil pressure switch system (Refer to P.13A-194, Inspection procedure30.) From the previouspage NO Check the ignition timing. (Refer to GROUP 11A - Engine Adjustment.)OKCheck that the crankanglesensor andtiming beltcover are properly installed. NG Check ignition coil spark for each cylinder. 1. Remove the ignition coil. 2. Install a new sparkplug to the removed ignitioncoil. 3. Disconnect the injector intermediate connector. Caution Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured. 4. Earth the sparkplug electrodesecurely. 5. Check that the sparkplug igniteswhen theengine is cranked.NGReplace the ignition coil. OK MUT- IIData list 14 Throttle position sensor (2nd channel) After warming-up, let theengine run at idlingwith no load. OK: 3,900 - 4,800 mVNGDClean around the throttle valve. (Refer to P.13A-220) DAdjust the throttle position sensor (Refer to P.13A-220.) OK MUT- IIData list 34 Air flow sensor reset signal (Refer to P.13A-198.)NGCheck the air flow sensor system (Refer to P.13A-133, code No.12.) OK Does theenginestall right after the acceleratorpedal is released?YESClean around the throttle valve. (Refer to P.13A-220.) OK MUT- IIData list 31 Small lampswitch (Refer to P.13A-198.)NGCheck the smalllampswitch system (Refer to P.13A-195, Inspection procedure 33.) www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-180 Inspection procedure 11 The engine stalls when starting the car. (Pass out) Probable cause In cases such as the above, the cause is probably misfiring due to a weak spark, or an inappropriate air/fuel mixture when the acceleratorpedal is depressed.DMalfunction of the ignition system DMalfunction of the EGR valve DAir stuck in the air intake system OK MUT- IIActuator Test 08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system (Refer to P.13A-197, Inspection procedure 36.) NO MUT- IIData list 68 EGR valve (Refer to P.13A-198)NGCheck the EGR valve system (Refer to P.13A-196, Inspection procedure 35.) MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. OK Check the following items in that order. DCheck the sparkplug DCheck that air is sucked in the air intake system. DBroken intakemanifoldgasket DDamaged or disconnected vacuum hose DDamaged air intake hose OK Check ignition coil spark for each cylinder. 1. Remove the ignition coil. 2. Install a new sparkplug to the removed ignitioncoil. 3. Disconnect the injector intermediate connector. Caution Never touch the connector terminal as approx. 100 mV is applied to the injector, or you are seriously injured. 4. Earth the sparkplug electrodesecurely. 5. Check that the sparkplug igniteswhen theengine is cranked.NGReplace the ignition coil. www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
GDI -Troubleshooting 13A-181 Inspection procedure 12 The engine stalls when decelerating. Probable cause The cause is probably an improper air/fuel ratio due to a faulty EGR system, or poor intake air volume due to a faulty electronic-controlled throttle valve system.DMalfunction of the electronic-controlled throttle valve system DMalfunction of the EGR valve OK Check the following items in that order. DCheck the sparkplug DClean around the throttle valve. (Refer to P.13A-220.) DAdjust the throttle position sensor (Refer to P.13A-220.) OK Check ignition coil spark for each cylinder. 1. Remove the ignition coil. 2. Install a new sparkplug to the removed ignitioncoil. 3. Disconnect the injector intermediate connector. Caution Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured. 4. Earth the sparkplug electrodesecurely. 5. Check that the sparkplug igniteswhen theengine is cranked.NGReplace the ignition coil. NO MUT- IIData list 68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection procedure 35.) OK Check the vehicle speed sensor system (Refer to P.13A-144, code No.24.)NGRepair OK MUT- IIData list 79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system (Refer to P.13A-162, code No.P92) NO MUT- IIData list 26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system. (Refer to P.13A-192, Inspection procedure 28) NO MUT- IISelf-Diag Code Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS CODES. Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes. www.WorkshopManuals.co.uk Purchased from www.WorkshopManuals.co.uk
