I first cleaned the EGR, then I replaced the EGR - to no avail.
Looking into this problem more deeply ,I have ascertained that the sensor part of the EGR Value works fine, but I have scoped the PWM drive to the EGR motor and there is nothing there.
So, I guess either there is a wiring fault between the EGR Valve and the ECM
or the ECM itself is defective (blown EGR motor driver).
I'm trying to trace the wires from EGR Valve to ECM.
I attach the relevant part of Volvo wiring diagram.
The 2 ECM pins I'm interested in are labelled B:15 and B:16.
What I need to know is how to find these on the ECM Connector. The Volvo wiring diagrams don't list the ECM pinout as far as I can see and Volvo do not seem to use the standard Bosch pin numbering.
- EGR_wiring.png (36.38 KiB) Viewed 3525 times