Engine cranks over-no start;
This week one of our customers had his vehicle towed in for a no start. He had just replaced the water pump and then it wouldn’t start. His Dad thought the computer was bad so they replaced it. No luck! So here we go, hook up the scan tool and found out there’s no communication. Each vehicle has numerous modules (computers) and this particular vehicle the Anti-lock Brake Module was capable of communication but not the Powertrain Control Module, Electronic Brake Control Module, Radio, Security or the Air Bag Module. That’s when we go to the wiring schematic to find out what circuits are in common. There are a couple of splices on the serial data and somewhere there is a short to ground. We disconnected all modules in the serial data wiring until we pin pointed the problem to the Air Bag module (located under the driver’s seat). We removed the seat and carpet to find the module and it was completely corroded from moisture and heat. The technician replaced the module and wire harness, reprogrammed the module and communication came back and now the vehicle starts and runs. Today’s vehicles are very complex and require the right tools by skilled techs to repair them. This is an example of repairs in the automotive field.
Greg's Garage
