How or what is the cause of Engine back firing

How or what is the cause of engine back firing.

Model: Elantra MD

Year model: 2012

Displacement: 1.8 cc

How or what is the cause of engine backfiring.

= This case for the Elantra new model first time for me to trouble shoot. i make road test to confirm the problem & for the engine to get the normal temperature. after a half an hour of engine running turn off the engine.immediately the problem occured means the customers problem confirm. check with the GDS ( Global Diagnostic System ) for the trouble code but there is no trouble code found then all current data also they are in good condition.

= I will try to barrow one good ECU and fixed then make another road test after half an hour turn off the engine. then the problem disappear.

=Replace new ECU.

How to Check a Trouble Code P0237?

How to Check a Trouble Code P0237?

Model: Hyundai Auto

Gasoline : Diesel

 

How to  Check a Trouble Code P0237?

P0237 Boost Press. Sensor - Circuit Low Input

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Study Guide and Component Location Study Guide and General Description Study Boost Pressure Sensor(BPS) is installed in intake manifold and senses the pressure of air inside of intake manifold which is compressed by turbo charager. Study Measuring mass air flow accurately with the information of intake mainfold pressure, mass air flow and intake air temperature, ECM performs actuating correction of EGR and VGT. Study When excessive intake manifold pressure is detected, engine power generation is limited to protect engine because too highly compressed pressure due to turbo charger may harm engine. Study Guide and DTC Description Study P0237 is set when the voltage below 0.2V - mimimum output voltage of BPS - is detected for more than 2 sec.. Study This code is due to open in power circuit or short to ground in signal circuit. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause   DTC Strategy Study • Voltage monitoring • BPS circuit • BPS component Study Enable Conditions • IG KEY "ON" Study Threshold Value • Output signal below minimum value(below 200mV) Study Diagnostic Time • 2 sec. Study Fail Safe Fuel cut NO • Boost pressure is fixed at 1000 hpa. EGR Off YES Fuel Limit YES Check Lamp OFF Specification Pressure [Kpa] 20 100 190 250 Outpur voltage [V] 0.4±0.077 1.878±0.063 3.541±0.063 4.650±0.077 Diagnostic Circuit Diagram Signal Waveform & Data Fig1). This is the waveform of BPS as accelerating from idle state. Signal voltage rises as accelerating. Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide

How Geometric Turbocharger Works?

How Geometric Turbocharger Works?

 

How Geometric Turbo charger Works?

Model: Hyundai Engine

2011  D 2.0 CRDI  Engine  Engine Control  P0234 Turbocharger/Supercharger Overboost Condition

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Study Guide and Component Location Study Guide and General Description Study VGT(Variable Geometric Turbocharger) is the device which increases the efficiency of turbocharger at low rpm and lasts optimum turbo efficiency at high rpm as varying the cross sectional area through which exhaust gas passes turbocharger impeller. It relieves turbo lag at low speed and increse engine power generation. Study Engine speed, APS signal, MAFS and Boost pressure sensor data are inputted to ECM. Study ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT actuator duty to maintain optimum state of air compression. Study Guide and DTC Description Study P0234 is set when real boost pressure is much lower than target boost pressure for more than 15 sec. at above 1750RPM and 10~22mg/hub of fuel injection quantity. Study This code is due to poor connection of VGT solenoid valve vacuum hose, vacuum leakage, clogging, VGT turbo charger component failure. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Signal monitoring • VGT solenoid component • VGT vacuum line • VGT turbo charger component Study Enable Conditions • Engine running (at above 1750RPM and 10~22mg/hub of fuel injection quantity) Study Threshold Value • Real boost press. is much lower than target boost press. Study Diagnostic Time • 15 sec. Study Fail Safe Fuel cut NO • - EGR Off YES Fuel Limit YES Check Lamp ON Specification VGT Actuator Component Resistance VGT Actuator Operating Hz VGT Actuator Operating Duty 14.7 ~ 16.1Ω (20°C) 300Hz 76% at idle, decreases as accelerating Signal Waveform & Data Fig.1) VGT actuator output waveform at 79% duty( (-)duty ). Duty decreases as boost pressure increases. Fig.2) VGT actuator duty( (-)duty ) decreases as accelerating.

How to Check the Secondary Fuel Pump of CRDI?

How to Check the Secondary Fuel Pump of CRDI?

 

How to Check the Secondary Fuel Pump of Fuel Pump?

 

Model: Hyundai Cars

Fuel: Diesel

Year of Model:2011

Displacement: 2000cc

2011  D 2.0 CRDI  Engine  Engine Control P0231 Fuel Pump Secondary Circuit Low

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Study Guide and Component Location Study Guide and General Description Study Vain pump type fuel pump which is driven by electric motor is applied to this vehicle. Study Fuel pump which is installed inside of fuel tank supplies fuel to high pressure pump. Study ECM controls Fuel pump relay to supply power to low pressure fuel pump. Study The relay operates for 1.5 sec. for the diagnosis fuel pump relay at IG KEY ON, then if engine speed above 45rpm is detected by CKPS, relay turns ON and fuel is supplied to high pressure pump. Study Guide and DTC Description Study the P0231 is set when no current or excessively low current is detected in fuel pump relay control circuit for more than 1 sec. Study at Fuel pump relay ON condition. This code is due to open or short to ground in glow relay control circuit or internal open in Fuel pump relay component. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • Fuel pump relay control circuit • Fuel pump relay component Study Enable Conditions • IG KEY "ON" (monitoring only performed within relay operating condition) Study Threshold Value • Short to GND • Wiring open Study Diagnostic Time • 1.0 sec. Fail Safe Fuel cut NO • - EGR Off NO Fuel Limit NO Check Lamp OFF Specification Relay Coil Resistance Motor Type Pumping Pressure 75±10Ω(20°C) Electric motor type vein pump 4 - 5 bar Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide

How to Repair my Sonata Engine not Start.

How to Repair my Sonata Engine not Start.

 

How to Repair my Sonata Engine not Start.

Model: Hyundai Sonata YF

Year of Model: 2011

Fuel: Gasoline

Displacement: 2400cc

 

1) Study Guide and Condition:

• Study Engine not Starting unless shake the shifting lever.
• Study Intermittent Shock Shifting During Driving.

2) Study Guide and Cause:

• Due to Transmission Range Switch Internal Loose Contact.

3) Diagnosis :

1. Study Scan tool Check
   = Transmission Range Switch.
2. Study Check Shifting lever 3x then the problem occurs.
3. Study Replace with Goo TR switch the make testing.= OK

4) Study Guide and Repair Parts

1. Replace TR switch

How Code P0101 Sets a Trouble?

How Code P0101 Sets a Trouble?

 

2011  D 2.0 CRDI  Engine  Engine Control  P0101 Mass or Volume Air Flow Circuit Range/Performance

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Component Location Study guide and General Description Study Mass Air Flow Sensor (MAFS) is digital sensor. Study Measuring mass of air flow, signal is outputted as frequency(Hz). ECM performs EGR system feed back control with the information of measured mass air flow. Study (The role of MAFS in diesel engine is different from gasoline engine. Fuel injection quantity is decided by MAFS signal in gasoline engine.) Study When the amount of EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through MAFS(contains oxygen) decreases. Study Thus, with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity. Study Guide Notice Study NOx is produced in the reaction of nitrogen and oxygen. Study If least intake air required for complete combustion flows into combustion chamber by controlling EGR gas(contains no oxygen) Study which is recirculated to combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen. Study Guide and DTC Description P0101 is set 1)Study when Air mass ratio(real/threshold) above 1.5 or below 0.85 is detected for more than 10 sec.. or 2) short to battery or ground in MAFS or IATS signal circuit is detected for more than 0.58 sec. or 3) short to low or high voltage line in IATS signal circuit is detected for more than 0.6 sec. DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • MAFS circuit • MAFS component Study Enable Conditions • Engine running Study Threshold Value • Air mass ratio(real/threshold) above 1.5 or below 0.85 - 12 sec. • Short to low or high voltage line in IATS signal circuit - 0.6 sec. • Shrot to battery or ground in MAFS or IATS circuit - 0.58 sec. Study Diagnostic Time • Refer to threshold Value. Study Fail Safe Fuel cut NO • - Study EGR Off YES Study Fuel Limit YES Study Check Lamp OFF

How CRDI Engine & Code P0182 Works?

How CRDI Engine & Code P0182 Works?

 

2011  D 2.0 CRDI  Engine  Engine Control

How CRDI Engine & Code P0182 Works?

P0182 Fuel Temp Sensor A Circuit Low Input

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Study Guide and Component Location Study Guide and General Description Study Fuel Temperature Sensor is NTC thermistor installed in fuel supplying line. It Study senses the temperature of fuel supplied to high pressure pump. Study Fuel temperature is limited (engine power is limited) to keep fuel temperature from reaching at 120°C. This Study limit is to protect fuel line such as high pressure pump and injectors from damages due to rapid deterioration by vapor-lock phenomenon which can occur at high temperature or destruction of oil membrane. Study Guide and DTC Description P0182 is set when the voltage below 0.053V - minimum voltage of FTS output - is detected for more than 2.0 sec.. This code is due to short to ground in FTS signal circuit. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy   • Voltage monitoring • FTS circuit • FTS component Study Enable Conditions • IG KEY "ON" Study Threshold Value • When output signal is below the minimum value.(below 0.053V)   Study Diagnostic Time • 2.0 sec. Fail Safe Fuel cut NO • Fuel temp. fixed at 85°C EGR Off NO Fuel Limit NO MIL OFF Specification Tmeaueeprtr -3°C 0 -2°C 0 -0-0 00 2°C0 Resistance 22.22~31.78kΩ 13.24~18.10kΩ 8.16~10.74kΩ 5.18~6.60kΩ 2.27~2.73kΩ Temperature 40°C 50°C 60°C 70°C   Resistance 1.059~1.281kΩ 0.748~0.904kΩ 0.538~0.650kΩ 0.392~0.476kΩ   Diagnostic Circuit Diagram