Why is my OBD system not working?

The most common reason for getting no OBD code is simply a blown fuse. Even a fuse dedicated solely to the car’s computer diagnostics can blow for no apparent reason. Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box.

Where do you plug in an engine diagnostic?

Plug your car code reader into the diagnostic link connector under the dash (engine off).

How can I tell if a fuse is blown?

Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.

How can you tell if your spark plugs are bad?

Step 2: Check your spark plugs. Look for carbon tracking in the form of a black line running up and down the porcelain portion of the plug. This is evidence of the spark traveling down the plug to ground and is the most common cause for an intermittent misfire.

How to find the diagnostic trouble code on a car?

Use a scan tool to find the diagnostic trouble code (DTC) numbers for the problem. If you do not have access to a scan tool, your local parts store can scan your car for free. Step 2: Get a printout with all the code numbers. The DTC numbers show specific circumstances where the collected data does not meet acceptable values.

Where are the spark plugs on a General Motors engine?

The placement of each spark plug wire on the distributor cap is directly correlated to the engines firing order. For example; a standard V-8 General Motors engine has eight individual cylinders. However, each cylinder fires (or reaches top dead center) at a specific time for optimal engine efficiency.

How to diagnose a no spark or loss of power condition?

“X” refers to the cylinder in which the misfire occurred. For example: P0300 refers to a random misfire, P0304 refers to a misfire occurring in cylinder 4, while P0301 signifies cylinder 1 and so on. Pay attention to all ignition coil primary circuit codes.

When do you need to do an engine diagnostic?

Conducting an engine diagnostic when your vehicle’s self-diagnostic system apparently isn’t detecting any problems can be difficult. But you still can diagnose engine performance and driveability problems like… …if you know what are the components or systems most likely to cause these common issues.

How to put Nissan engine in diagnostic mode?

There are three methods of putting vehicles with this connector into diagnostic mode. If one does not work, try the others. Select one of the methods below. This is the prefered method. To select this method click ‘Connector Method’. Does not require a connector. To select this method click ‘Pedal Method’.

Use a scan tool to find the diagnostic trouble code (DTC) numbers for the problem. If you do not have access to a scan tool, your local parts store can scan your car for free. Step 2: Get a printout with all the code numbers. The DTC numbers show specific circumstances where the collected data does not meet acceptable values.

How to diagnose and repair an electric motor?

Example: If the electric motor control is a well pump pressure control switch,check the pressure control switch settings – cut-in and cut-out; inspect for burned, pitted switch contacts or for dirt or wear. where we explain how a failed starting capacitor OR depending on the motor design, a bad centrifugal switch can prevent a motor from starting.