How does the FICM control the fuel injector?
To drive the fuel injector, the FICM produces two control signals for each injector. The open coil is driven (via a 20A pulse) to open the injector. This shifts the spool valve in the injector to the open state. Once this has taken place, high pressure oil is directed on top of the injector intensifier piston.
Why did my GMC injectors have to be replaced?
A red flag went up in the owner’s mind because the GMC had been bought from a private owner who claimed that all eight injectors had been replaced prior to the sale. The current owner called a mutual friend of ours who works as a heavy-duty mechanic for a local construction company.
How to diagnose a 6.0 power stroke FICM?
0 PowerStroke FICM OBDII FAULT CODE DIAGNOSTICS. The below fault codes may help point you in the right direction when diagnosing the 6.0 Power Stroke FICM: P0261 Cylinder 1 Injector Circuit Low. P0264 Cylinder 2 Injector Circuit Low. P0267 Cylinder 3 Injector Circuit Low. P0270 Cylinder 4 Injector Circuit Low. P0273 Cylinder 5 Injector Circuit Low
What should the ground voltage be on an injector?
One will be connected to ground and will read 0 volts. The other should read around 12 volts. Step 5: Repeat with all injector wiring harnesses. Leave the ground lead in position and test all of your injector wiring harnesses. They should all be around 12 volts. A lower reading means there is excess resistance in the wire somewhere.
When does the FICM cycle through the injector?
The FICM will cycle through the injector outputs when the key is placed in the ON position. This is called pre-cycle and the time of pre-cycle varies with engine temperature. The pre-cycle is done as a self test of the injector circuits. The FICM internally generates 48V used to drive the injector solenoids.
0 PowerStroke FICM OBDII FAULT CODE DIAGNOSTICS. The below fault codes may help point you in the right direction when diagnosing the 6.0 Power Stroke FICM: P0261 Cylinder 1 Injector Circuit Low. P0264 Cylinder 2 Injector Circuit Low. P0267 Cylinder 3 Injector Circuit Low. P0270 Cylinder 4 Injector Circuit Low. P0273 Cylinder 5 Injector Circuit Low
A red flag went up in the owner’s mind because the GMC had been bought from a private owner who claimed that all eight injectors had been replaced prior to the sale. The current owner called a mutual friend of ours who works as a heavy-duty mechanic for a local construction company.
Where are the cylinders on a Duramax injector circuit?
The FICM separates the high-voltage injector circuits into two groups: cylinders #2, #3, #5 and #8 and cylinders #1, #4, #6 and #7. The firing order is 1-2-7-8-4-5-6-3 with the odd-numbered cylinders located on the passenger side of the engine and the even-numbered cylinders located on the driver’s side.