How Do You Test A PMD On A 6.5 Diesel?

Touch the pink wire terminal of the PMD connection with the probe of the test light. The light should turn on when the ignition is turned on. If this isn’t the case, troubleshoot the circuit. Next, make a solid connection between the CLIP of your test light and one of the positive battery connections.

How do I know if my PMD is bad?

OR “How do I determine what to replace?” DIAGNOSIS: Simply said, if your check engine light isn’t illuminated and you’re experiencing stalling, you’ll almost certainly require a new PMD. You should have your codes examined if your check engine light is on. This is something that Auto Zone and others will do for free.

How do I bypass PMD 6.5 diesel?

You can’t start the engine without the PMD; it must to be present and plugged in. Your only option if the PMD is bad is to replace it with a good one. It will live a lot longer under the front bumper if you replace it with a heat sink and relocate it there.

How do you test a 6.5 injection pump?

Start the car to test the lift pump. Allow petrol to drain from the line into a container by opening the T-Valve for at least 30 seconds. If the engine dies or no gasoline flows out of the line after 30 seconds, your lift pump is broken.

What is a PMD on 6.5 diesel?

On 6.5L diesels in GM vehicles, a Pump Mounted Driver (PMD) is the black box on the side of the injection pump. The PMD is a solenoid pack that generates heat and then absorbs it using the injection pump and the fuel flowing through it.

What does a PMD resistor do?

The Calibration Resistor on your 6.5L Diesel determines the injection pump’s maximum fuel delivery volume. On an ancient fully mechanical injection pump, it’s similar to the maximum fuel adjustment screw.

Will a PMD work without the resistor?

A resistor is required for the PMd. I recently worked on a truck that had no resistor in the PMD, and when the PCM looks for the resistor and doesn’t find it after a certain number of key turns (50 key turns), it throws a code and the truck runs poorly.

How do you check the fuel pressure on a 6.5 Diesel?

  • Start the engine and then check the fuel pressure by cracking open the drain/bleed valve. At idling, the fuel pressure should be between 3 and 7 psi. Anything less than 3 psi could mean the lift pump isn’t working properly and needs to be replaced.
  • If the fuel pressure is within spec, the lift pump is unlikely to be the source of the problem.

How do I know if my lift pump is working?

, immediately switch the ignition key to the start function to prevent the engine from starting, and then let go of the key, leaving it in the run position (the lift pump should run 25 seconds). If you don’t hear the lift pump, check for 12 volts going into it; if it doesn’t run with 12 volts, it needs to be replaced. Replace the fuel filter if you hear it running and it doesn’t make at least 5 PSI at idle.