2006 S60 2.5 T5 fuel electronic module

[Robert Carter]

Unplug the connector from the PEM and touch battery positive to pin2 on the harness connector (Blue wire) and see if it runs. The feed pump you're testing grounds directly to the chassis which means it runs on DC voltage on some sort of duty cycle governed by the PEM. I'm not sure the PEM would not turn on this pump if it thinks the LH side is empty. Check for open or short across pins 2 & 3 for the LH level sensor at connector 54/36 going to the tank (wire colors should be Brown and Green)

The main fuel pump (which is working or the car wouldn't run) grounds back through the PEM but is controlled variable speed/PWM may not have a true ground path with vari-speed control circuitry in play.

will a regular voltage tester work on this? how do I test for a short on pin 2 and 3? the car stalls often and the gas gauge starts and stops often. Today the car acted like it was starved for gas when I know that both sides of the tank was full. I pulled over and waited 5 minutes and it ran me all the way home about 10 miles. the problem starts when the car warms up and I drive about 20 miles. Sorry for all of the questions guys. but this thing has gotten PERSONAL between the s60 and myself. I will fix it or I will junk it. btw the car is/was a cream puff 94,000 when I bought one owner dealer serviced. Thanks Robert.

[mrbrian200]

Not programmed means yes: the PEM is plug and play, if you need to replace it, just plug a new one in and it will work as designed with no software/vehicle programming intervention or error codes showing up in VIDA.

Between pins 2 and 3, read with an ohmmeter. These level sensors are a simple potentiometer but I can't seem to find the resistance spec for this particular one.

However, I think you may be experiencing problems related to an extended warranty item: PEM was relocated to inside the trunk as it was determined to be subject to corrosion underneath the car. You may be able to get a dealer to fix this all up for you free of charge. That extended service warranty may have run out last year for an '06. But I'm not sure. It was already done on my car or I'd have tracked it straight to a dealer when I bought it fall 2015.

The level sensor cutting in and out is most likely an electrical/corrosion issue at that connector mentioned in a previous post. If a dealer can't/wont fix you up at N/C this is something any experienced mechanic should be able to work through provided they have the schematic to reference. The fuel delivery/pump/level sensors/wiring and function isn't really all that complicated. You might need a new/good used PEM. But that won't fix a problem with the gas gauge.

[Robert Carter]

Thank you Sir.