The Case of the Finicky Flatbed

Here’s a diagnostic case study involving all the critical elements of a great electrical system who-done-it: vehicle started fine when first brought in but wouldn’t start after the repair was completed; aftermarket equipment plays a key role in this mystery; the vehicle owner had tinkered with the system and (bonus)…

Amazing Reference for Techs and Shops

For this month’s resource piece, we are spotlighting the resources archive on Diagnostic Network (Diag.net). The resources archive is a place where technicians share information that can be useful for their peers, everything from known good wave forms and known good sensor data to reference charts and repair procedures. It…

Troubleshooting 5V Reference Circuits

In modern vehicle design, 5-volt reference signals/circuits are a key aspect of vehicle command and control. As summarized by Gary Goms, the 5-volt reference signal typically “flows through a sensor containing a resistance that varies according to changes in temperature, pressure or position. Due to this variable resistance, the signal…

Honda Crank Profile Relearn Tips

Another one to file under, “Is it Hardware/Is it Software/Is it a Network Problem?” In this very helpful post from Bob in Massachusetts, he walks through his diagnostic process on a 2009 Accord that had a previous unsuccessful repair attempt. Based on an initial review of vehicle data, he thought…

Another Battery Change Surprise

We have discussed the unexpected consequences of battery changes several times in the past. Here’s a new one on us, provided by Douglas from Miami, Florida. In this tech tip, he talks about loss of digital clock function after replacing the battery on a 2011 Chevrolet Avalanche and how he…

Charging GM Vehicles Equipped with Stop-Start

We have discussed the service implications of Stop-Start Systems on several occasions, but we weren’t aware of the importance of following a key charging best practice until we saw this post from the GM diagnostic master, James from Florida. We have always stressed the importance of connecting your negative lead…

Don’t Forget the Reinstall!

Here’s a great reminder about the importance of ensuring that everything removed from the vehicle during a repair or service is reinstalled prior to sending the vehicle on its way. Glenn from Texas shares the story of a Ford F350 brought in for a no-crank complaint and a suspicious noise…

Time Saving Alternator Tip

Here’s a great tip to help you save time and effort when diagnosing a locked up engine. Brooks from Texas shares the cautionary tale of his own vehicle and how he and one of his best customer’s shops thought that the engine on his C1500 Silverado was locked up and…