What is the diagnostic code for exhaust gas recirculation?
P0402 OBD-II Trouble Code: Exhaust Gas Recirculation Flow Excessive Detected. Cost of diagnosing the P0402 code. P0402 is a diagnostic trouble code (DTC) for “Exhaust Gas Recirculation Flow Excessive Detected”.
How is exhaust gas recirculation ( EGR ) test done?
In an EGR system there is a pipe which comes off the exhaust manifold. The first EGR system tests you should perform are EGR idle tests. Both tests involve leaning the engine at idle by allowing exhaust gas to enter the engine through the EGR system. Apply vacuum to the EGR valve at idle.
How does the compete exhaust gas recirculation system work?
The compete EGR system can be tested at idle by disconnecting the car’s electrical connection from the EGR solenoid and replacing it with an external 12 volts to the EGR solenoid. 12 Volts will activate the EGR solenoid, causing full recirculation of the exhaust gases to the engine.
What happens when exhaust gas is recirculated at idle?
At idle full recirculation of the exhaust gases should kill the engine. Your EGR system is mechanically functioning properly if the engine dies because the solenoid has activated the valve and exhaust gases have entered the engine intake. Even if you are able to kill the engine at idle there can be PCM signal problems.
What causes excessive exhaust gas recirculation flow excessive?
P0402 FORD – Exhaust Gas Recirculation Flow Excessive Detected Repair Importance Level: 2/3 Repair Difficulty Level: 2/3 P0402 FORD Possible Causes EGR volume control valve stuck open Faulty EGR volume control valve EGR solenoid valve harness is open or shorted EGR solenoid valve circuit poor electrical connection
In an EGR system there is a pipe which comes off the exhaust manifold. The first EGR system tests you should perform are EGR idle tests. Both tests involve leaning the engine at idle by allowing exhaust gas to enter the engine through the EGR system. Apply vacuum to the EGR valve at idle.
The compete EGR system can be tested at idle by disconnecting the car’s electrical connection from the EGR solenoid and replacing it with an external 12 volts to the EGR solenoid. 12 Volts will activate the EGR solenoid, causing full recirculation of the exhaust gases to the engine.
What is the diagnostic code for excessive EGR?
It is one of the generic diagnostic trouble codes in a number of makes and models that are related to the vehicle’s EGR. Code P0402 indicates that your car computer has detected excessive EGR.
What does the code p0402 mean on an engine?
P0402 is an OBD-II generic code that the engine control module (ECM) has detected indicating the engine exhaust gas recirculation (EGR) valve is flowing too much recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold.
What causes a p2479 code on an exhaust gas sensor?
Causes for this P2479 code may include: Defective exhaust gas temperature sensor. Excessive exhaust leak. Blown fuse or fuse-able link (if applicable) Excessive carbon buildup on sensor.
What is the diagnostic code for exhaust gas?
Cost of diagnosing the P0402 code. P0402 is a diagnostic trouble code (DTC) for “Exhaust Gas Recirculation Flow Excessive Detected”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
What happens if the exhaust gas valve malfunctions?
SITUATION Due to an issue with the exhaust-gas recirculation (EGR) valve, the malfunction indicator lamp (MIL) lights up and vehicle engine may begin jerking or have sporadic idle fluctuations. Additionally, the fault memory may read the following fault codes:
How is the exhaust gas recirculation valve plausibility?
272E00 -Exhaust-gas recirculation valve, plausibility: mechanically faulty, near closed position 290900 -Air system, air to EGR exhaust mass flow, plausibility measured air mass compared to calculated air mass too high 257E00 -EGR controller, position sensor, signal: Interruption or short circuit to ground
What is the International Code for hazardous exhaust?
Equipment, appliance and system service rooms that house sources of odors, fumes, noxious gases, smoke, steam, dust, spray or other contaminants shall be designed and constructed so as to prevent spreading of such contaminants to other occupied parts of the building. [F]502.1.4 Hazardous exhaust.
P0401 is a diagnostic trouble code (DTC) for “Exhaust Gas Recirculation Flow Malfunction”.
What causes exhaust gas recirculation system to fail?
Due to the large number of EGR system designs, the causes of failures in the system are many and varied. Typical causes are shorted, corroded, burnt, or otherwise damaged wiring and connectors, but some other common causes could include the following- Poor crankcase ventilation due to clogged or broken PCV valves. Infrequent oil changes.
What are the components of early exhaust gas recirculation ( EGR )?
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator.
How is exhaust gas recirculated in a PCM?
Design details of EGR systems vary rather widely, but the PCM generally calculates the actual amount of exhaust gas being recirculated by monitoring changes in the manifold pressure as the gas is being introduced, or prevented from entering the manifold.
What is diagnostic code for exhaust gas recirculation?
Diagnostic trouble code P0400 is triggered when the flow of exhaust gas recirculation is lower than what the powertrain control module (PCM) expects. In modern vehicles, the EGR valve is controlled by the PCM.
Due to the large number of EGR system designs, the causes of failures in the system are many and varied. Typical causes are shorted, corroded, burnt, or otherwise damaged wiring and connectors, but some other common causes could include the following- Poor crankcase ventilation due to clogged or broken PCV valves. Infrequent oil changes.
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator.
Design details of EGR systems vary rather widely, but the PCM generally calculates the actual amount of exhaust gas being recirculated by monitoring changes in the manifold pressure as the gas is being introduced, or prevented from entering the manifold.