Where does exhaust gas go in a p0400?
The gas is brought into the system from the No. 4 cylinder exhaust manifold. From there, it winds through the back of the cylinder head into the intake manifold and to the EGR valve. Then it goes back into the intake manifold and up an EGR transfer tube.
When is the p0400 code set for EGR?
The P0400 code is set when the EGR valve is commanded wide open and the expected change in manifold pressure measured by the MAP sensor does not occur. This EGR system uses several components. The EGR vacuum solenoid is controlled by the ECM and is turned on to allow vacuum to the pressure transducer – it basically turns the system on or off.
What causes excessive EGR flow in a Miata?
As it turns out, by the time the Miata has a good number of miles (maybe over 50K or so), the intake manifold can build up an excessive amount of carbon because of the exhaust gas recirculating and the crankcase vapors being drawn in.
What causes a check engine light on a Miata?
This is done by opening and closing an EGR valve. The Miata’s computer calls for the valve to open and close based on a number of factors. If the computer senses that this is not being done properly (valve stuck open or closed or lines plugged), then the CEL is turned on.
As it turns out, by the time the Miata has a good number of miles (maybe over 50K or so), the intake manifold can build up an excessive amount of carbon because of the exhaust gas recirculating and the crankcase vapors being drawn in.
How much does it cost to repair a Mazda p0405?
The cost of diagnosing the P0405 MAZDA code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
What is the diagnostic code for excessive EGR flow?
There is another diagnostics connector in the engine compartment that will not fit the OBDC-II scanner tool, and you may have to point the technician to the proper connector (like I did) if you take it to a place like AutoZone. If the code is P0402, the diagnosis is excessive EGR (exhaust gas recalculation) flow.
This is done by opening and closing an EGR valve. The Miata’s computer calls for the valve to open and close based on a number of factors. If the computer senses that this is not being done properly (valve stuck open or closed or lines plugged), then the CEL is turned on.