How to Diagnose a Bad ECM/ECU on a 2001 XC70

2001 Xc70

MVS Volvo Forums member jcb went to great lengths to isolate the ECU in his 2001 XC70. He did work to make sure it was the culprit. This forum topic is how he diagnosed a failing ECM/ECU on his P2 Volvo. After two days of troubleshooting, I’m ready to send my ECM out for repair (2001 […]

Decrease your chances of CEM or DIM failure with a FAN

mrbrian200 had a goal: extend the life of and/or prevent temporary freakouts of the CEM and DIM modules in P2 Volvos. It’s a simple yet brilliant modification that can’t hurt, and will almost certainly help, the longevity of your Volvo. I’ve come across several reports by owners who state when their CEM or DIM freaks […]

More Manual Transmission Swap Tips & Tricks

MVS Contributor tryingbe goes ALL OUT doing an auto to manual transmission swap. He has outstanding information and warnings on what to buy, where to get it, and the transmission swap to do list. This Volvo forum topic joins the many others here on manual swaps. The topic was started by beigg who asked… What is […]

New ETM Dead out of Box

MVS Contributor precopster ran into a frustrating problem: a bad Magneti Marelli ETM… a new ETM dead out of the box. As if Volvo owners didn’t have enough trouble with 1999-2002 Volvos with failing/failed electronic throttle modules, now we have an example of a brand new ETM failing… right out of the box! See the MatthewsVolvoSite ETM […]

ECM Airflow Motor is Important

MVS Contributor oragex made a video speaking about the importance of the ECU/ECM airflow motor. ECM airflow motor is important for keeping your car’s computer cooled down as it draws air from the cabin compartment. These little motors go bad limiting the airflow but can easily be replaced! Caution

RWD Volvos Have PNP Switch Flashing Arrows Too

MVS member Bob had the common flashing arrow light on the dash of his 1995 960. While looking at the wiring harness connector (8 sockets) that plugged into the PNP switch connector (8 pins), I noticed one wire looked “funny” – and for good reason. It was no longer connected to the crimped on socket […]

The Birth, Life & Death of an XC90 T6

Ok, that title was a little dramatic, but that’s the idea. MVS member XVTer bought a 2004 XC90 T6 a few years ago for his wife. In between the buying date and selling date he posted some of the best tune-up, Stage 0 and restoration info for XC90s I’ve ever seen. This is his XC90 T6 story. […]

XeMODeX is a MVS Sponsor!

We’re proud to announce XeMODeX is partnering with this site to bring all of us information and Volvo troubleshooting solutions. XeMODeX cut its teeth developing and marketing a fix for Volvo’s ETM fiasco with their in-house developed contact-less potentiometer ETM. This announcement means XeMODeX’s ad appears at the top of MVS pages. Please let them […]

2000 S70 ABS Issues?

MVS Forums member Russ B documented his ABS and STC lights scenario: Here’s the low down. I leave work tonight, driving slow around several 90 degree left & right turns. On one RIGHT turn I applied the brakes and the ABS went off (made its ABS noise like when a tire skids) and both the […]

DIY ETM

MVS Forums member Yehuda explains how he fixed the ETM on his 2001 S60. This should be similar or identical to all P2 Volvos with the Magnetti Marelli module. ETM SOFTWARE RELOAD did work, now the car is stable at idle, does Not shake and gives good pedal feedback, well it’s EVEN BETTER than before […]

Which ELM 327 To Buy?

So you want to use a phone or tablet to access your Volvo’s codes, reset procedures, and all the goodies you’re locked out of without an expensive scan tool. Since the age of dedicated scan devices is over, you can now use devices you have, like smartphones and tablets. But you need a bridge, something […]

Fuel Relay #103 — Is it Really Necessary?

For MVS’s 1500th (!) Volvo Repair Database entry, I bring you what is probably the most technical post in the VRD: jose456891‘s Fuel Relay #103 — Is it Really Necessary? I had to lie down after I read it. And yes, I read it. And it was mildly fascinating. A big thanks to all the technical guys […]

Bluetooth OBDII Connect To ECU

MVS Forums contributor ESL explains how to connect to your Volvo’s ECU via Bluetooth adaptors: Torque uses the standard OBDII emission diagnostics. If you can’t connect with Torque, the first thing I’d try to do with Torque is find a way to force it to use the ISO 9141-2 protocol. If you can somehow monitor […]