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 […]

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

Troubleshoot Heat Soak ECM, BCM, CEM, & TCM

Detailed thread from hankb on troubleshooting ECM DIM CAN bus as function of heat and humidity: This is my second post on this forum regarding the same unsolved problem – you can find my first saga here on this site. That post was a year ago – it describes intermittent trouble with the DIM failing, […]

How to access ECM & TCM on 850, S70, V70, XC70, C70

How to remove ECU and TCU Modules MVS Forum member gchelidze tells us in text and (24!) photos how to access your ECU and TCU modules from under your Volvo 850, S70, V70, XC70, C70’s hood. He writes: “WARNING: I have done this procedure twice – once with battery lines connected and once with negative line […]

2013 S60 T5 AWD Engine Swap – DIY Basics

Volvo S60 Engine Out - DIY remove engine instructions for a 2013 S60

I blew an engine at 83K (timing belt slipped due to accessory belt shredding). I’m planning an engine swap. Can anybody please direct me to a how to? Is there anything else that I should replace at the same time? Donor engine is 2016 with 80K (50k miles). Any seals or anything that I must […]

When the C30 & S60 Went Racing

Volvo Touring Class C30 Racecar -  C30, K-Pax, racecar, SCCA

Dax Raub stands among the two dozen or so cars in his shop, pointing out an outrageous race Subaru STi over here, and an outrageous late-model custom street Camaro over there. Above it all, literally, is a  racing Volvo C30 on a lift, outrageous in a somehow quieter way, despite its past fame as a […]

2007 XC90 V8 Intermittent Fuel Pressure Cutout

Xc90 V8 Fuel Cutout

Shockwave has good patience and great DIY XC90 V8 intermittent fuel pressure diagnosis chops. Just have to get that out there. If you’re diagnosing a fuel cutout condition on a XC90 V8, this XC90 V8 intermittent fuel pressure forum topic is gold. Initial post in the thread: BACKGROUND: FUEL PUMP/ LEVEL SENDER replaced 6 months ago […]

Some P80s Are Exempt from Emissions Testing

Emissions testing: required for all Volvos made after the last ice age, right? Not for some 1993-2000 FWD/AWD Volvos. Volvo’s emission standards were too high on the P80 Volvos. Yes, too high. SonicAdventure: I have a 98 non turbo V70. Build date is 5/97. When I called the local Volvo dealer they said that my VIN […]

2008 XC70 3.2 Fuel Pressure Specs

2008 XC70 owner mrscullini is troubleshooting long cranking on his wagon. “When the engine is shut off, it pretty quickly bleeds down to 0. trying to diagnose a hard cold start with excessive cranking.” “Can somebody with vida/dice please provide observed fuel pressure numbers/specs at both the rail and overall system? I’m interested in readings […]

Throttle Body vs. New MAP Sensor

This thread documents that the P0106 code is often resolved by throttle body cleaning, not MAP sensor replacement. Saves users about 250 USD. Specific to the NA 2003 and 2004 Volvo P2 models. jkatz: Two years ago I bought a 2003 V70 FWD (no turbo) and I was getting an intermittent CEL that would come […]

How MAF Affects Idle, mpg and More

MVS Forums contributor and Volvo wizard jimmy57 explains how the mass airflow sensor affects the air/fuel ratio, idle, mpg and more and various Volvo models. On Bosch systems that is not really a MAP. It is used for boost pressure monitoring. The earlier extrapolation algorithm where MAF vs engine speed was used for boost level […]

Do our cars get used to one brand of fuel?

MVS Forums Member huzzsaba: Recently on a road trip, I filled up like I usually do at Canadian tire and got decent gas mileage that I usually get which is around 22 mpg. On the way back, I had to fill up at shell because there was no Canadian tire around, and I got the […]