939005168 - Y039 P0401 - EGR VALVE

The diagnostic equipment signals: Error P0401 (EGR valve).
This error is detected if the actual value of the exhaust gas recirculation flow is less than the nominal value of the exhaust gas recirculation flow.As a result, the exhaust gas recirculation valve is switched off and the supercharging pressure can longer be controlled and the quantity of fuel injected is reduced.
0Preliminary checksALL OKPROBLEMS ENCOUNTEREDACTION
Check that the engine oil level is correct    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Check that the air intake/vacuum circuit is working properly by carrying out the    See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the operation of the low pressure supply circuit by carrying out the    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITMove on to Step 1Oil level incorrectRestore the correct engine oil level    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY
1EGR operation checkALL OKPROBLEMS ENCOUNTEREDACTION
Check that the EGR valve is working properly by carrying out the    See Test 1080CB E.G.R. SOLENOID FUNCTIONAL TESTEnd of diagnosis