| fault code | P0488 |
|---|
| title | electric EGR valve operating fault sticking of the solenoid valve while driving |
| main customer complaints likely | the switching on of the warning light depends on the engine - lack of power - engine hesitation - noise: cold - smoke |
| back-up mode following returning of the faults | if the warning lamp lights - the engine management ECU stops the EGR regulation - the electric EGR valve auto-programming operations are no longer carried out - the ECU limits the flow of fuel and prohibits the cruise control/speed limiter |
| if the warning lamp does not light no back-up mode |
| conditions for returning of the fault | these faults are returned to confirm the loop difference faults P0490 or P0489: the electric EGR valve tends to jam |
| suspect areas / faulty components | programming of the electric EGR valve |
| type of solenoid valve DW10B Siemens: the electric EGR valve should be of type U |
| particle filter (in the case of vehicles fitted with a particle filter (PEF)). if the particle filter is partially clogged it may create a counter-pressure at the exhaust which prevents the opening of the electric EGR valve |
| electric exhaust gas recycling valve |
| appropriate tools | adaptor harnesses |
| multimeter |
| controlled terminal box (in manual mode) or manual terminal box |
| engine concerned | DW10B Delphi |
(*) consequence for the parameter measurements
- Electric EGR valve control OCR = 0 %
- Position repeat = 0 %
| fault code | P0488 |
|---|
| after sales description of the fault code | position indicator signal of the EGR valve: valve jammed during driving |
| description of the diagnostics | negative discrepancy of 35 % % between the EGR valve position reference value and the position measured for 10 s |
| conditions of activation of the diagnostics | consult the associated contexts for the Pcode forwarding conditions |
| conditions of disappearance of the fault | driving for 5 minutes |
| down-grade modes if fault present | inhibiting of the diagnostics and air flow sensor plausibility |
| cutting of the EGR valve |
| switching on of the warning lamp and/or warning message | warning lamp MIL |
| main customer complaints likely | jerking/stalling |
| smoke from the exhaust |
| lack of power |
| starting problem |
| suspect areas | electrical harness |
| air mixer |
| connector |
| exhaust gas recycling valve |
| fault code | P0488 |
|---|
| after sales description of the fault code | EGR throttle position copy signal (air mixer): negative loop difference |
| description of the diagnostics | positive difference of 10% % between the exhaust gas recirculation valve position reference value and the position measured (for 10 s) |
| conditions of activation of the diagnostics | consult the associated contexts for the Pcode forwarding conditions |
| conditions of disappearance of the fault | driving for 5 minutes |
| down-grade modes if fault present | inhibiting of the diagnostics and air flow sensor plausibility |
| change to "easy move" torque invalid (deactivation of automatic mode for the electronic parking brake) |
| switching on of the warning lamp and/or warning message | warning lamp MIL |
| main customer complaints likely | jerking/stalling |
| smoke from the exhaust |
| lack of power |
| starting problem |
| suspect areas | electrical harness |
| connector |
| air mixer |
| fault code | P0488 |
|---|
| after sales description of the fault code | air mixer: position incorrect (closed too far) |
| description of the diagnostics | the position measured is less than the reference by more than 50 % for 6 seconds |
| conditions of activation of the diagnostics | engine running for 6 s |
| conditions of disappearance of the fault | driving with the engine hot for 5 min while remaining below an engine speed of 2500 rpm under half-load |
| down-grade modes if fault present | opening of the turbo air cooler by-pass unit |
| switching on of the warning lamp and/or warning message | warning lamp MIL |
| main customer complaints likely | noise |
| smoke from the exhaust |
| diesel fuel consumption a bit higher |
| engine hesitating, cutting out |
| lack of power |
| suspect areas | air mixer |
| electrical harness |
| air doseur electrovalve |
| air mixer position copy |
| Vacuum circuit |
