IMP signal out of range high 2011 maxx 13

From the Maxxfarce 13 manual:

Fault Overview: Fault code sets when Engine Control Module
(ECM) detects Intake Manifold Pressure (IMP) signal voltage greater
than 4.825 volts (IMP greater than 616.5 kPa). Lamp Reaction
Malfunction Indicator Lamp (MIL) will illuminate immediately when
this fault is detected. Associated Faults None. Fault Facts None.
Drive Cycle to Determine Fault Status Continuous Possible Causes

• IMP Circuit Open or short to PWR
• SIG GND circuit Open
• Failed IMP sensor

The sensor circuit has a 5 volt supply and return wire to it. The sensor signal should be between approximately 0.3 volts and 4.7 volts. If 5 volts are coming back on the signal wire that usually means that the 5 volt return wire to the ECM is broken some where between the sensor and the ECM. I would start at the IMP sensor connector and give them the ten pound pull test. The wires in the insulation can break from vibration and flapping in the gentle breeze from the fan.

 

You have access to NED do you have access to Navistars service publications?
The diagram you need is 0000002941.pdf