Difference between revisions of "16786/P0402/001026"
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| − | == 16786/P0402 - Exhaust Gas Recirculation Flow | + | == 16786/P0402 - Exhaust Gas Recirculation (EGR): Excessive Flow == |
==== Possible Symptoms ==== | ==== Possible Symptoms ==== | ||
Revision as of 10:38, 13 April 2007
16786/P0402 - Exhaust Gas Recirculation (EGR): Excessive Flow
Possible Symptoms
- Drivebility problems (check dtc's with Knock Sensor)
- Irregular behaviour
Possible Causes
- EGR valve stuck open
- EGR damaged
- Circuit DPF EGR sensor (differential pressure) disconnected, short to B+ or Ground
- Slow responding DPF EGR sensor
- DPF EGR sensor downstream hose off or plugded
- DPF EGR sensor damaged, wrong attached
- Control Module damaged
Possible Solutions
- Check all wiring and connections to and from EGR and DPF-EGR
- Check the EGR: use a vacuumpump and pull open the EGR: rpm should change
- Clean the EGR
- Check / Replace EGR
- Check / Replace DPF-EGR
- Check voltage DPF EGR sensor (when idle and when EGR is open)
Special Notes
- The EGR system is monitored when driving at steady state and the EGR is commanded on. When the DPF-EGR sensor indicates that EGR flow is less then a desired minimum a dtc is set.
- N.B. mechanics with less knowledge do exchange the EGR often, but 75% sure the problem will be back (probably the DPF-EGR sensor causes the problem).