With the ignition on, the voltage drop across the ground terminal should be 0.1 Volts or less Do not connect to the body or chassis ground but to the battery terminal directly. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. If the scan tool does not receive data from an OBD II vehicle Dead Battery – If your car battery is dead or low, the OBD II scanner may not be able to establish a connection.Disconnected Wires – The wires connecting the OBD II port to the vehicle’s computer may be disconnected or damaged, preventing communication.Broken OBD II Port – Another potential cause is that the port where you plug in your scanner is damaged or malfunctioning.This could be due to a hardware or software issue. Faulty Scanner – The first possibility is that your OBD II scanner itself is faulty.There are a few reasons why your OBD II scanner may not be able to communicate with your vehicle. However, what happens when your OBD II scanner doesn’t communicate with your vehicle? In this guide, we will explore some potential causes and solutions for this issue. This tool allows you to retrieve error codes and other information from your car’s computer system, helping pinpoint the source of any problems. When it comes to diagnosing vehicle issues, one of the first steps is to use an On-Board Diagnostics (OBD) II scanner. Last updated on October 1st, 2023 at 06:47 pm
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