P0. 40. 2 Exhaust gas recirculation EGR system excessive flow detected Trouble. Codes. net. Trouble Code. Fault Location. Probable Cause. P0. 40. 2 Exhaust gas recirculation EGR system excessive flow detected Hose leakblockage, basic setting not carried out if applicable, wiring, EGR valve, EGR solenoid, ECM What Does P0. Mean A malfunctioning EGR system will cause several codes such as P0. P0. 40. 1 P0. 40. Often a P0. 40x code is caused by a blockage in the EGR system and is not caused by a failed component. Possible Problems with the EGR System. Most common problem carbon blockage where the EGR valve connects to the intake manifold. Leaks in the vacuum lines. EGR solenoid not opening or closing. How does the cars computer detect a P0. A typical OBD II test sequence is shown below For a P0. Ford Windstar Fuel Pump Wiring Diagram' title='2002 Ford Windstar Fuel Pump Wiring Diagram' />View and Download FORD 2006 FREESTAR owners manual online. Automobile. 2006 FREESTAR Automobile pdf manual download. Sat 2 Math Level 2 Calculator Programs here. Infiniti I30 Fuse Box Diagram, 2005 Ford F150 Camshaft Sensor likewise Cam Sensor Location Lexus furthermore 97 Jeep Grand Cherokee Wiring Diagram as well. Trouble Code Fault Location Probable Cause P0402 Exhaust gas recirculation EGR system excessive flow detected Hose leakblockage, basic setting not carried. Rugged wilderness explorers like your dependable, workhorse Ford F150 are intended for rough use wherever theyre taken but they must have proper upkeep and high. P0. 40. 2 excessive flow the PCM will monitor the following components during the test sequence shown above EGR valve pintle position if the EGR valve is electrically controlled. MAP sensor if the EGR valve is vacuum controlled the PCM will read changes in the MAP sensor output in response to exhaust gas recirculation. The voltage from the MAP should increase when the EGR valve is opened. EGR Components. Above is a diagram of an exhaust gas recirculation system Ford with DPFE. The exhaust gas recirculation EGR system has a few primary components EGR Valve recirculates exhaust gas through the intake manifold. EGR Solenoid the brains of the EGR system. Ford Windstar Fuel Pump Wiring Diagram' title='2002 Ford Windstar Fuel Pump Wiring Diagram' />Vacuum Line present in vacuum operated systems. EGR Tube intake for exhaust gases. DPFE stands for Differential Pressure Feedback for EGREGR Valves Timing. Why recirculate Recirculation of the exhaust gas is primarily done to prevent NOx emissions. High NOx emissions during driving can indicate an EGR problem. Recirculation reduces combustion temperatures below the reaction temperature of Nitrogen and Oxygen. View and Download Ford 2002 Bantam workshop manual online. Bantam Automobile pdf manual download. Alle nye Haynes til bil, kr. Stort set alle haves p lager, resten skaffes hurtigt. Mange brugte haves, kun kr. Gratis ordbog over. A secondary benefit of recirculation is improved fuel economy since fuel in vapor form is extremely efficient to burn. Timing is very important for exhaust gas systems. Recirculation should not occur at idle. If at idle, the recirculation of exhaust gas can lean out the engine killing it. Appropriate time to recirculate is when the car is driving and at a certain RPMThe amount of exhaust gas recirculated will depend on the RPM. Higher RPMs higher recirculation. Control of timing can be mechanical or electrical. Types of EGR Valves. Vacuum Operated EGR Valve. The EGR Valve controls the recirculation of exhaust gases to the intake manifold. The EGR valve is normally closed preventing recirculation of exhaust gases to the intake manifold. EGR valves have pintles that prevent exhaust gas from entering the manifold. Electrically operated EGR Valve. Normally 5 wireMost vehicles made after 2. EGR valves. Vacuum Line. Some cars vary the vacuum pressure instead of the EGR solenoid duty cycle to control exhaust gas recirculation. These systems have onoff EGR solenoids. ZSsDijb24/0.jpg' alt='2002 Ford Windstar Fuel Pump Wiring Diagram' title='2002 Ford Windstar Fuel Pump Wiring Diagram' />EGR Solenoid. The brains of the EGR system. Employee Kpi Excel Template'>Employee Kpi Excel Template. It controls the exhaust gas valve. Normally closed. When open the EGR solenoid supplies vacuum from the intake manifold to the EGR valve. Vacuum causes the EGR valve pintle to lift off the valve seat which allows exhaust gases to enter the intake manifold. Disabled during idle and wide open throttle. In GM cars the solenoid is disabled in Park or Neutral. Receives signals from the PCM based on engine load and RPMEGR solenoid often vent manifold vacuum to atmosphere when closed this is important to know when testing for a leaky solenoidDuty cycle one solenoid control method wherein solenoid voltages are varied by the PCM to change the amount of recirculated exhaust gas. DPFENormally used on Fords. Stands for Differential Pressure Feedback for EGRSimilar to a MAP sensor, the DPFE measure the pressure difference between exhaust gases and atmosphere to determine the flow of the exhaust gas recirculation. EGR Tube. In an EGR system there is a pipe which comes off the exhaust manifold. The pipe connects to the EGR valve. Tests. 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. This test will determine if there is a blockage in the EGR valvesystem. If there is a blockage the engine will NOT die when the vacuum is applied to the EGR valve at idle. The compete EGR system can be tested at idle by disconnecting the cars electrical connection from the EGR solenoid and replacing it with an external 1. EGR solenoid. 1. 2 Volts will activate the EGR solenoid, causing full recirculation of the exhaust gases to the engine. 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. Once you have eliminated mechanical malfunction with the above EGR idle tests, you should test the PCM with a scan tool. Vacuum Operated EGR Valve Testing. Remove vacuum line from EGR valve. Check if there is vacuum on the vacuum line. Cetatea Alba Iulia Program Vizitare. Vacuum would indicate the EGR solenoid is stuck open You should test the EGR solenoid See EGR solenoid TestsApply external vacuum to EGR valve. The engine should die if the EGR valve is functioning. If the engine does not die, either 1 the EGR valve diaphragm is not opening in which case you will need a new EGR valve or 2 the EGR valve passageways are clogged in which case you can clean the passageways and retest the valve. EGR valve Vacuum Line Test. Disconnect vacuum line from the EGR valve. Disconnect vacuum line from the EGR solenoid. Connect external vacuum to the vacuum line. With the EGR solenoid end of the vacuum line plugged apply vacuum to the vacuum line. Check that the vacuum holds. If there is a leak in the vacuum line the vacuum will not hold. Electronic EGR valve Testing. Two tests recommended to remove the EGR valve from the car to perform testing of EGR valve. Test main power supply to EGR valve 1. Obtain wiring diagram of EGR valve to determine which pins are for powerii. Connect 1. 2 volts to the EGR valveiii. Verify the pintle responds to application of voltage and is in the closed position when no voltage is supplied. Test position sensing. Obtain wiring diagram of EGR valve to determine which pins are for 5 Volt reference and PCM signalii. Connect 5volt reference to the signal wire with digital voltmeteriii. Set voltmeter to measure resistanceiv. Press pintle in with screwdriver or other toolv. Watch voltmeter reading. Resistance should decrease proportional to pintle position difference from its closed position. NOTE If your EGR valve passes the above two tests but you still have an EGR problem you should test the PCM signals to the EGR valve. With a scan tool you can tell the PCM to open the EGR valve at idle and verify that the engine dies. EGR Solenoid Testing. The EGR solenoid testing is similar to the EGR valve. You will want to check the vacuum integrity and electrical response of the solenoid. Check Vacuum Integrity. Disconnect vacuum lines to EGR solenoid. Connect hand held vacuum pump to one of the EGR solenoid ports. Close off the other EGR solenoid port. Check that the EGR solenoid will hold a vacuum. Check for Battery Voltage to Solenoid.
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