How do you diagnose a bad IPR valve?
Common symptoms of a bad 7.3 Powerstroke IPR
- Poor, rough, or unstable Idle, especially when you let off the accelerator.
- Injectors surging when you accelerate.
- Stalling out.
- Crank no start.
- Loss of overall power.
What should IPR pressure be?
An IPR valve defaults to 15% if it is unplugged or has failed. In this instance, an engine will not start as it will not be able to build oil pressure; a low ICP condition should be present. IPR valve duty cycle should not exceed 30% at idle once the engine reaches operating temperature.
How do I find my IPR duty cycle?
After the engine oil warms up, you should see a drop in both Engine RPM, ICP and IPR DC. Check the Injection Pressure Regulator (IPR) Duty Cycle under a load. Drive the vehicle at Wide Open Throttle (WOT) under a load (pulling a hill). Verify the IPR Duty Cycle Does not increase above 65% with ICP less than 2000 psi.
What is IPR duty cycle?
This is the Duty Cycle – A Duty Cycle is a time per division of an electrical waveform, a “Signal” to or from the PCM. Also known as I/O on a Bus. In this instance, the cycle of operation of a the IPR operating intermittently rather than continuously.
What are late signs of increased intracranial pressure?
Changes in blood pressure, pulse, and respiratory pattern are usually late signs of raised ICP in clinical practice. These signs are related to brain stem distortion or ischaemia.
What causes low ICP pressure?
Spontaneous intracranial hypotension may occur as a result of an occult leak of CSF into another body cavity. More commonly, decreased ICP is the result of lumbar puncture or other medical procedures involving the brain or spinal cord.
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.
What are the codes for shorted coils in FICM?
Open coils produce low current which sets the injector circuit low codes (ie. P0261, P0264, … , P0282). Shorted coils (side shorts) or short to grounds produce high current which sets the injector circuit high codes (ie. P0262, P0265, …, P0283).
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
How does the FICM work with the ignition switch?
It uses engine speed and position signals (*CKPO, *CMPO) to determine when the injectors need to be activated. The ignition switch provides *KEYPWR to the FICM. Once this signal is detected by the FICM, the *MPR output of the FICM will engage the FICM relay. This in turn provides the *FICM PWR and *FICM Logic PWR voltages to the FICM.