16786/P0402/001026
From Ross-Tech Wiki
Revision as of 13:32, 11 June 2006 by Gerrit Speek (talk | contribs)
16786/P0402 - Exhaust Gas Recirculation Flow Excessive Detected
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).