P0690 is an OBD-II generic code for a high voltage problem with the power supply to the ECM/PCM. This means the vehicle’s computer is not receiving voltage that is within the manufacturer’s parameters.
Where is the ECM power relay?
engine main fuse relay control box
The relay is located in the engine main fuse relay control box. The defective ECM-power relay is removed from the control box by pulling it straight up and out of socket. The new ECM-power relay is installed into the socket and the engine scanned for codes.
What does a PCM power relay control?
The ECM power relay, or the PCM relay, acts as a switch that provides power to the ECM. when the ignition key is turned off, the switches within the PCM relay no longer receive battery. If the PCM relay stops switching and working like it should, the vehicle will not be able to function properly.
WHAT IS A engine control module relay?
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.
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.
How do I reset my ECM?
Zitat von Youtube: Position to disconnect the positive battery cable. 3 wait 30 seconds for tap the positive terminal cable to the positive battery post. 3 times 5 reconnect the terminal cable 6 start the vehicle.
How do you know if your PCM module is bad?
Let’s get started!
- Your ‘Check Engine’ Light is On. …
- Your Car Won’t Start or Starts Roughly. …
- Sudden Loss of Gas Mileage. …
- You Failed Your Emissions Test. …
- Your Engine Stutters or Stalls. …
- Erratic or Random Shifting. …
- You’re Receiving a PCM-Related Error Code. …
- What to Do If You Experience PCM Failure Symptoms.
Can a PCM be repaired?
Typically, PCMs are not rebuilt in the same way that alternators and water pumps because there are no mechanical parts that wear out. Remanufacturing a PCM generally means testing the computer, isolating and repairing any faults that may be found, then retesting the computer to make sure everything works correctly.
How do you test a PCM relay?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
How do you fix an ECM failure?
Fortunately, these issues can usually be resolved by replacing the corroded wires. If one of the wires shorts out to the frame, the ECM may fail entirely. This can also happen due to power surges due to a lightning strike or arc welding on the vehicle frame. Installing a new starter can also cause ECM failure.
Is there a fuse for the ECM?
Zitat von Youtube: Our next step is going to locate the ECM fuse by using the fuse diagram located on the backside of the lid or by doing a simple google search with. The key in the on position.