Why is my car not connecting to the ECM?

If you can physically locate all the modules on the bus, unplugging them one at a time might identify the culprit. When you unplug the bad one, all the others should be reachable. Click to expand… Yes, this. Unplug the ebcm next and see if the tech 2 can communicate with the ecm.

How does the PCM receive the battery voltage?

ADDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. Check for an open circuit. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting.

Why do I need to Reset my ECM?

If your check engine light comes on then chances are there may be an internal electrical issue within your vehicle that must be addressed. Before replacing any parts you want to reset your ECM to ensure that part replacements are absolutely necessary. There are a few ways to reset your Engine control modules.

What to do if the OBD II scanner doesn’t communicate with the vehicle?

What to do if the OBD II scanner doesn’t communicate with the vehicle. 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. Do not connect to the body or chassis ground but to the battery terminal directly.

What happens when you replace the PCM in a car?

After replacing the PCM, the engine may crank and even fire initially, but die almost immediately. Certain Ford vehicles incorporate the Passive Anti-Theft System (PATS). This security feature immobilizes the vehicle by disabling the fuel pump, injectors and possibly the starter, until the ignition key relearn is performed on the car.

What does the security feature on Ford PCM do?

This security feature immobilizes the vehicle by disabling the fuel pump, injectors and possibly the starter, until the ignition key relearn is performed on the car. Motorcraft Service provides a reference chart that identifies all Ford PATS vehicles.

What does the Check Engine light on a PCM mean?

by Richard Ristow A Powertrain Control Module (PCM) is a car’s central diagnostic computer. It monitors a vehicle’s engine and fueling system, and once a problem is detected, the PCM turns on the vehicle’s “Check Engine” light. This light will also activate if the PCM begins to falter or become unresponsive.

What is the Powertrain Control Module ( PCM )?

A Powertrain Control Module (PCM) is a car’s central diagnostic computer. It monitors a vehicle’s engine and fueling system, and once a problem is detected, the PCM turns on the vehicle’s “Check Engine” light. This light will also activate if the PCM begins to falter or become unresponsive.