What is a generator control circuit?
The PCM controls your vehicle’s generator through a generator turn-on signal circuit, allowing it to turn the generator off and on. Under some operating conditions, the PCM can turn off the five-volt signal and, thus, turn off the generator too. The PCM also has fault-detection circuitry to monitor these operations.
How do I fix code P0621?
What repairs can fix the P0621 code?
- Use the OBD-II scanner to check the vehicle.
- Reset the codes and then test drive the vehicle to see if the code returns.
- They will inspect the wiring and connections.
- The mechanic will replace any damaged, corroded, or disconnected wires, connectors, and other components.
What is a generator field F terminal circuit?
Error Code P0626 is defined as Generator Field/F Terminal Circuit High. This means there’s a fault detected in the generator field circuit, usually caused by a defective alternator, battery, wiring, or poor communication between the control modules. The armature spins inside the field coil, which the battery energizes.
What is code P0621 00?
Error Code P0621 is defined as Generator Lamp “L” Control Circuit Malfunction, meaning there’s a malfunction detected in the generator lamp “L” control circuit, usually caused by defective generator or corroded wires. The L simply means the lamp control circuit. The generator lamp is housed in the instrument panel.
How do you fix P0625?
What repairs can fix the P0625 code?
- Replace any damaged electrical components (this includes blown fuses)
- Replacing the control module ground strap.
- Disconnecting all of the CAN’s pins to test them (this takes a long time and can be very expensive so should therefore be the last step)
How do I fix code P0625?
Depending upon the diagnosis, common repairs for this code include:
- Replacement of damaged electrical components (blown fuses)
- Replacement of control module ground strap.
- Disconnecting of CAN pins and testing them (this can be an expensive and challenging step, and should be done last)
How do you tell the difference between an alternator and a generator?
Main Differences between Alternator and Generator
| Alternator | Generator |
|---|---|
| It can only generated Alternating Current “AC”. | It can generate either of both Alternating current AC or Direct Current “DC”. |
| The rotating part or rotor is the magnetic field. | The rotating part or rotor is the armature. |
What does the trouble code p0621 mean on a generator?
The P0621 Trouble Code indicates that there is a malfunction with the generator lamp “L” control circuit. What the P0621 code means. One of the control modules, such as the powertrain control module, has found a fault with the generator lamp “L” control circuit.
How does the PCM control the generator on a car?
The PCM controls your vehicle’s generator through a generator turn-on signal circuit, allowing it to turn the generator off and on. When the generator needs to come on, the PCM sends a five-volt signal through the generator turn-on signal circuit to the voltage regulator.
How do mechanics check for a bad generator?
Your mechanic will use an OBD-II scanner to check which trouble codes your vehicle has stored. They’ll then check the generator for any signs of a bad connection or damage that may have caused a misread of the voltage. The various circuits associated with the generator will have to be looked at too.
How does a generator turn-on work?
When the generator needs to come on, the PCM sends a five-volt signal through the generator turn-on signal circuit to the voltage regulator. Doing so allows the voltage regulator to start controlling the generator field circuit.