What is a power relay control circuit?
The Control Circuit is the part of the relay that determines when the output component is energized or de-energized. The control circuit functions as the coupling between the input and output circuits. In electromechanical relays, the coil accomplishes this function.
How do I get rid of code P0690?
What repairs can fix the P0690 code?
- Replacing the ECM/PCM relay.
- Repairing ECM/PCM power wiring.
- Replacing ECM/PCM fuses.
- Replacing damaged battery cables.
- Replacing the ECM/PCM.
What’s the ECM code?
Error code P0204 occurs when the PCM (Powertrain Control Module) or ECM (Engine Control Module) detects a cylinder 4 injection circuit malfunction. In other words, this error code is triggered when these modules determine a low or high voltage drop or resistance at the injector 4.
What does the ECM relay do?
What Is An ECM Power Relay? ECM stands for engine control module – the computer that makes your entire car function on its own. The ECM power relay monitors and delivers power to the ECM which in turn decides how virtually every other component in your engine runs.
What is the fault code for ECM / PCM Power relay?
P0685 is the fault code for ECM/PCM Power Relay Control Circuit /Open.
Why does my ECM have the code p0685?
Since the code P0685 is usually accompanied by a no-start condition, ignoring it will not likely be an option. If this code is present and the engine will start and run, suspect a faulty PCM or a PCM programing error. Potential causes for this code to set are:
What causes a p0685 power supply circuit to open?
Some common causes of code P0685 could include the following- Defective PCM power-supply relay Low system voltage Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors, including battery terminals Defective ignition switch Failed or failing PCM or other control module.
How does a PCM Power supply circuit work?
Most PCM power-supply circuits are relatively simple and straight forward. When the ignition is turned to the “ON” position, power is fed to the relay, which causes an electromagnet to close two contact points- one of which is permanently connected to battery power.