ICP Sensor - 7.3 Injection Control Pressure Sensor SECRETS

Your ICP sensor - 7.3 Injection Control Pressure Sensor - continuously monitors your diesel engine's fuel pressure.

The 7.3 ICP sends the current pressure reading to the Powertrain Control Module (PCM) which in turn signals the 7.3 Injection Pressure Regulator (IPR) to add or reduce pressure.

The three of them, along with the 7.3 HPOP, provide enough oil pressure to the oil rails so that when you press on the accelerator, your injectors actuate, your engine gets diesel and the cylinders fire ... ideally, as smoothly as possible.

Here's how to figure things out when that doesn't happen...

7.3 Powerstroke ICP Sensor

7.3 ICP Sensor Basics

Just what does the ICP sensor on a 7.3 Powerstroke do?

In a diesel engine as heavily-reliant on adequate and correct oil pressure as the 7.3 HEUI system is, the 7.3 PCM needs instant and accurate information on the amount of pressure in the 7.3 oil rails. This is so that the PCM can determine how much pressure, at any given second, to deliver to the injectors for maximum fuel firing efficiency.

Broken down, the 7.3 Injection Control Pressure sensor tells the PCM what the oil pressure is in the driver's side oil rail. It uses a five volt signal and returns it to the PCM. This analog voltage signal to the PCM tells it how much pressure's in the oil rails.

And in conjunction with the 7.3 IPR, HPOP, and PCM, the Injection Control Pressure Sensor on your 7.3 provides this pressure information feedback in a continuous loop.

Broken down and simplified, these are the four components on your 7.3 Powerstroke diesel that regulate oil pressure in order to accurately and efficiently actuate your injectors enabling them to fire and create combustion.

  1. 7.3 ICP - Injection Control Pressure SENSOR (measures oil rail pressure in psi)
  2. 7.3 PCM - Powertrain CONTROL Module (send voltage signals to control oil pressure)
  3. 7.3 IPR - Injection Pressure REGULATOR (valve that plunges to physically create (regulate) oil pressure)
  4. 7.3 HPOP - High Pressure Oil PUMP (pump responsible for delivering the physical oil to the oil galleys and thus the oil pressure needed to actuate the injectors and ignite the fuel)

If, or should I say when, your 7.3 ICP fails, the PCM in your truck won't know how much pressure's in the oil rails and it won't be able to regulate that pressure to efficiently actuate the injectors, resulting in poor engine performance.

What will actually happen is that it will get incorrect data from your 7.3 ICP and then deliver incorrect oil pressure, causing at best rough-running and at worst a no-start condition.

But let's not get ahead of ourselves. 

ICP Sensor 7.3 Location

Just where is the ICP sensor on a 7.3 Powerstroke, anyway?

Your 7.3 diesel's ICP sensor is located on the driver's side cylinder head toward the front of the engine compartment ... near the HPOP.

ICP Sensor 7.3 Location Diagrams

ICP Sensor 7.3 Location
ICP Sensor 7.3 Location Diagram

7.3 ICP Sensor Symptoms

7.3 Powerstroke ICP sensor failure symptoms include:

  • Rough or lugging idling
  • Surging
  • Missing
  • Bucking
  • Stalling, especially at a full stop

The worst symptom of a bad, i.e. failed, ICP sensor on your 7.3 is that your engine just won't start at all.

But, to tell you the truth, so many failed parts on your 7.3 diesel cause the exact same symptoms that it's hard to tell what's not working.

Luckily, and if you have even an inexpensive ODBII scan tool combined with a free to cheap cell phone app, you can do some further ICP investigation.

If there's oil on the sensor's female plug receptacle, its leads, or around the pigtail connector male plug, you've got a failed ICP sensor.

7.3 ICP Sensor Symptom - CEL

If your Check Engine Light - CEL - comes on and you have a diagnostic tool to read the OBD-II trouble code, a code of  P2285 or related ICP codes P2283, P2284, P2286, and P2287 point to trouble in your 7.3's ICP sensor electrical circuit or the sensor itself.

But before we get to scan tools, apps, and PIDs...

7.3 ICP Sensor Test

One quick way to diagnose a failed 7.3 ICP sensor is to lift the plastic clip on the wiring connector and remove the pigtail from the sensor. If there's oil on the sensor's plug receptacle, its leads, or around the pigtail connector, you've got a failed ICP sensor.

Here's why.

As mentioned above, the 7.3 ICP sensor measures pressure from the oil rail. Over time, all that oil pressure on your ICP pushes and exerts force on the sensor's internal components and plastic electrical connector housing. A couple hundred thousand miles of that and it's bound to fail. When it does, the oil will cause bad electrical readings as well as corrode the sensor's ability to send those signals.

Here's how to further test ICP sensor 7.3 as the cause of whatever above symptoms your Powerstroke's having.

With your engine running, pull the connector, disconnect your 7.3 ICP pigtail. This causes the PCM to deliver a default ICP value of 725 PSI at idle. As apposed to the stock setting of 500-550 PSI at idle. There should be a noticeable difference in idle when you unplug your ICP.

If you don't feel a difference, your 7.3 ICP is most likely already running on this default setting. This could mean that your ICP is bad.

Now, some people do this, but I wouldn't recommend running your 7.3 without ICP readings. The sensor's there for a reason. Replace it if it's bad.

7.3 ICP Pressure

7.3 Injection Control Pressure PID

If you have a scan tool you can view your 7.3 diesel's various ICP pressure readings with the following PID.

  • Short Name: ICP
  • PID #: 221446
  • Units: PSI

7.3 ICP Pressure Numbers

Here are some helpful numbers in diagnosing your 7.3 ICP pressure.

  • Starting - A pressure of 500psi is the minimum required to start your 7.3 diesel
  • Idle - Stock idle ICP pressure should be around 475psi on injectors with stock nozzles
  • Maximum - ICP of 2700-2800psi is stock maximum
  • Idle Default unplugged - 700 is 7.3 ICP sensor unplugged idle reading - default PCM value
  • Cranking while unplugged - 2200psi is the 7.3's ICP sensor unplugged while cranking

7.3 IPC pressure at idle

Warmed up, your 7.3 diesel’s ICP pressure at idle should be close to 480-500psi (for a 99-2003) with about 8-12% IPR duty cycle.

1994-1997 - 7.3 ICP Pressure at Idle

  • 7.3 ICP pressure at idle - 575-600psi
  • IPR Duty Cycle – 11-14%

1999-2003 - 7.3 ICP Pressure at Idle

  • 7.3 ICP pressure at idle– 475-490psi
  • IPR Duty Cycle – 8-12%

7.3 ICP Pressure at Wide Open Throttle in Neutral

  • 7.3 ICP pressure – 1100-1200psi
  • IPR Duty Cycle – 18-21%

At WOT in neutral your 7.3 ICP should be – 1100-1200psi – With a caveat that after s/n 896812, after 3 minutes of WOT with no load, the number would be 1800psi. Because at WOT, your 7.3 ICP pressure number will spike and then level off if you stay on the throttle.

7.3 ICP Pressure During Hard Acceleration

  • ICP – 2450-2700psi
  • IPR – 35-40%

A good, healthy 1999-2003 7.3 HPOP can hold between 2800-3000psi during hard acceleration. A lot of 7.3s do just fine with an HPOP that produces 2600-2800psi.

And, if you're a masochist...

7.3 Powerstroke ICP Voltage

If you've got an Auto Enginuity scan tool or SnapOn scan tool and want to get into the grit and grime of troubleshooting... Well, you're either a tech or you seriously love troubleshooting. In any case, here are some numbers from the service CD on normal PSI, MPa - Megapascals, and 7.3 ICP Voltage.

PSI

MPa

V

0

0

.02v

 200

1.5

.4v

 400

 3

0.73v

600

 4

  .96v

800

 5.5

1.2v

1000

 7

1.4v

1200

 8

1.6v

1400

 9.7

1.9v

1600

 11

2.1v

1800

 12.4

2.3v

2000

 13.8

2.6v

2200

 15.2

2.8v

2400

 16.5

3v

2600

 18

3.3v

2800

 19.3

3.5v

3000

 20.6

3.8v

7.3 Powerstroke ICP Sensor Part Number

I've had an aftermarket 7.3 ICP sensor in my 2002 Ford F250 7.3 for about 2 years, so it works for me. If you're "OEM or death" and have the money, here's an OEM one on Amazon.

7.3 ICP Part Numbers

OEM Ford 7.3 ICP Part Number - F6TZ-9F838-A

International 7.3 ICP Part Number - 1807329C92

Interchangeable 7.3 ICP Part Numbers - F4TZ-9F838-A , F6TZ-9F838-A, 1807329C92, ICP102

OEM 7.3 ICP sensor

OEM 7.3 ICP (Amazon)

7.3 Powerstroke ICP Sensor

Aftermarket 7.3 ICP Sensor

On the other hand, if you're like me and are willing to roll the dice to save some dough, here are a couple of aftermarket 7.3 ICPs that should do the trick.

Aftermarket 7.3 ICP (Amazon)

ICP Sensor 7.3 Injection Control Pressure Sensor

Aftermarket 7.3 ICP with Pigtail (Amazon)

7.3 Injection Control Pressure Sensor With Pigtail

NOTE: I've got an enhanced AAA towing membership as insurance against my ... "proclivity" to use aftermarket parts.

Just sayin'...

How to Replace ICP Sensor Ford 7.3

How to change the ICP sensor on 7.3 Powerstrokes.

  • Step 1 - Disconnect both negative battery cables
  • Step 2 - Remove the electrical 7.3 ICP pigtail connector from your ICP sensor. There's a retaining clip that you need to lift up and pull up and away from the sensor.
  • Step 3 - Using a 5/8" crow's foot wrench on the ICP sensor itself loosen the sensor and remove it. (This assumes your 7.3 ICP sensor has never been replaced and is the OEM sensor with the 5/8" nut recessed from the body of the sensor)
  • Step 4 - Spread some clean oil on the new ICP sensor's o-ring and install it. The replacement ICP sensor takes a 1-1/16" deep socket or wrench.
  • Step 5 - Torque your new 7.3 ICP sensor to spec - 9 lb./ft. - 108 INCH pounds.
  • Step 6 - If your ICP pigtail is coated with oil, cracked, or frayed replace it. (See 7.3 ICP Pigtail Replacement Below)
  • Step 7 - Apply dielectric grease to your newly-replaced ICP sensor terminals.

7.3 Injection Control Pressure Sensor Change Video

7.3 ICP Sensor Torque Value

9 lb./ft. - 108 INCH pounds

7.3 ICP Sensor Pigtail

ICP Pigtail 7.3 Part Number

5C3Z-12224-A

7.3 ICP Sensor Pigtail

7.3 ICP Pigtail Replacement

As you can see, the three wires on the replacement pigtail aren't color-coded. So a "trick" I use is to remove, splice, and solder ONE WIRE AT A TIME, matching it to the same wire on the old pigtail as I go.

  1. Strip one of the pigtail wires
  2. Cut the corresponding wire on the old pigtail
  3. Strip the old pigtail about 1/2"
  4. Slip the heat shrink connector over one wire (I use heat shrink as I can never get the crimp connectors to work)
  5. Twist the two wires together
  6. Solder them
  7. Slip the heat shrink over the soldered wires
  8. Heat them with heat gun to tighten


7.3 ICP Sensor Summary

The ICP sensor on your 7.3 Powerstroke diesel is a pretty common failure item. When it does fail the good news is it's relatively easy to diagnose, remove, and replace with a new part to get you and your 7.3 Powerstroke back on the road.

Oh, and don't forget to check and replace the ICP pigtail if necessary.

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