# NISSAN NAVARA D40, DPF LIGHT AND EGR VALVE P0403
05/06/2016 | Author: admin | No comments | Categories: blog • Diagnostics • Exhaust System
# Vehicle
Nissan Navara, D40 yd25ddt, DPF Light on. (read the whole story not the fault you think it would be!)
# Symptom:
A client of ours had mentioned that the vehicle had poor fuel economy and came in for a service we had check a few items such as fuel pressure and the infamous engine breather this vehicle did not have a catch can. 2 weeks later the vehicles DPF light had come on, this is where that fun started to work out what fault codes where displayed and why this could have happened only 2 weeks after checking faults codes and couldn’t find any reason to use more diesel than normal.
# Diagnostics:
The scan tool was used first of to test for fault codes
and as follows
- P2002 – DPF soot accumulation
- p0403 – EGR system
# TESTING A FAULTY EGR VALVE
How the system works, a five wire system which consists of EGR feedback or TPS style switch to indicate travel movement and Motor Circuit, controlled by engine ECU.
Tools Needed.
- Suitable scan tool to communicate with Denso CR system
- Oscilloscope
- 12mm socket and ratchet
# The real Problem.
after test driving this vehicle a few times to check if there was any progress it always felt as though there was no turbo kicking in, back to the workshop to test the variable vane turbo vacuum and found that the vacuum could not operate as the main vacuum line has a split in it.
Repair by cutting and inserting a vacuum joiner. re test drive. Found that full power is now back to what is expected of a Nissan navara.
# Summary:
Finding the information and using our heads including writing this post took 2.5 hours to complete including retesting after, explain to the client what was wrong another story, but we feel this one is nailed.
## Images
Book in
Similar issue on your vehicle? Call the workshop and we will advise what to expect.