NegativeOne
06.05.2021 16:52:58
ECM won't power the pump unless it sees the engine cranking. so a failed crank or cam position sensor will cause a no start with no power to the fuel pump.
See full version: Volvo no power to fuel pump
ECM won't power the pump unless it sees the engine cranking. so a failed crank or cam position sensor will cause a no start with no power to the fuel pump.
Fuse is good. relay is good, no power at pump. Getting voltage at pin 87 when ignition on. no power at 87a ignition on or cranking. Voltage at pin 86 when cranking. According to a schematic the fuel pump relay is #11 (m112) under drivers side dash. I checked power wire between pump and all pins at relay box and no continuity. maybe wrong relay. Can someone help with further diagnostic steps?
Yep! I just replaced the module in my '05 XC when I had a no start, fortunately, in the driveway. Took the module off and it actually rattled thanks to the IC corroding off the circuit board. How the thing ran for as long as it did with the corrosion present on the board? Bought a used one off eBay for around $60 or so and it's been right as rain ever since. BTW, VIDA was able to id the problem exactly so if you can get a VIDA scan that would probably pinpoint your problem vs. hoping for a result via parts replacement. [links]
Yeah, this is a dated posted but I did not see a possible answer so mine is below based on recent experience. [links]
#11 fuse is for the main fuel pump, in-tank fuel pump and the fuel system relay. The fuel system relay and how to access it is in the attached, which is headed for the 940 but is the same on the 740:
here
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90
Post by billofdurham » Tue May 11, 2010 3:49 pm more
Hey guys, having a big problem. more
1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
I'll start at the beginning. more
Post by RobTheModd » Mon Aug 13, 2012 11:00 pm more
If you need to replace the battery, follow this guide to replace your Volvo battery. [links]
Other problems include Volvo refuses to turn over, especially in cold weather, key getting stuck, or immobilizer issues which prevent engine start.
Also, it is possible that the alternator is not providing enough charge. Checking the battery voltage with a multimeter will reveal a lot. here
First of all, you need to distinguish between two very different situations. [links]