is this a bad maf wiring fault ? ecu ? any help, thank much

volrem · Post by **volrem** » Fri Jun 22, 2018 3:38 pm

Fuse F35 shares common power with MAF, EGR and turbo control solenoid.

Martinjensen did you compare ECM pinout to wiring diagram? I saw that there is an error. Two ECM pins correspond to wiring diagram but one has different pin number. Not sure if it's error in VIDA or in EWD. Either way it would be good to know and report it to Volvo.

Wiring shows pins B:13/B:17/B:27 but VIDA B:13/B:17/B:19

piconewtrain · Post by **piconewtrain** » Sat Jun 23, 2018 7:29 am

Thank you every one ,for your kind input .I cant tell how much I appreciate it .
I am totally confused at moment . Pin b27 is empty on ecu . ? Egr feed from fuse 35 as same feed for maf . But I checked egr before and that egr feed 100% is from ecu and it is worked on duty cycle . . .
I checked car E3 technical web for diagram For this car egr feed from ecu .. but for maf sensor comes up a 6 pin maf !

volrem · Post by **volrem** » Sat Jun 23, 2018 8:03 am

Probably wiring diagram is incorrect then and VIDA states correct pin. Check if you have white-blue wire going to pin B:19 instead of B:27

EGR has 5 wires:

12V from fuse F35
Ground side control from ECM (PWM)
5V from ECM for position sensor
Ground from ECT for position sensor
Position sensor signal to ECM

piconewtrain wrote:But I checked egr before and that egr feed 100% is from ecu and it is worked on duty cycle

ECM is ground switching EGR valve but power comes from fuse. So 12V side is from fuse and ground side from ECM.

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