Injectors have no Pulse, not getting power to injectors?

Hi,

The code is unique. The PCM provides a 5v reference to the oil pressure switch and the MAP sensor (manifold absolute pressure sensor). These 5-volt reference circuits are independent of each other outside of the PCM but are bussed together inside the PCM. Therefore, a circuit condition on one sensor's 5-volt reference circuit may affect the other sensor's 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P0641 sets.

Start with the oil pressure switch. Disconnect it and check for power. If you have a digital multimeter, you should see 5v with the key on. You can do the same with the MAP sensor

Let me know the results.

Joe

Hi,

Thank you for the update. I'm glad to know you found the issue. Make sure the connector or wiring to the sensor isn't the issue.

As far as the throttle body, if it isn't causing problems, I would leave it alone. If you have a new one and the sensors are different, that can lead to new and more difficult issues to resolve.

Let me know if the new part takes care of the problems.

Take care,

Joe

Hi,

If the fuel pressure is within specification, then I would suggest reinstalling the original ones to see if the problem goes away. There is a good chance that is the cause.

Let me know.

Joe

Hi,

Thanks for the update. Hopefully, that will take care of the issue.

If you plan to clean the MAF, here is a link you may find helpful:

https://www.2carpros.com/articles/mass-air-flow-service

Let me know how things turn out for you. I'm interested in knowing.

Take care,

Joe