Section 112.3
SPN 3563/FMI 3

The typical diagnosis for this fault is an Intake Manifold Pressure Sensor short circuit.‪

Section 112.3.1
Short Circuit Check

Check as follows:‪

1. Disconnect the Intake Manifold Pressure Sensor (IMP Sensor).
2. Disconnect the 120–pin MCM connector.
3. Measure the resistance between pin 2 and 3 of the IMP Sensor connector. See Figure "Intake Manifold Pressure Sensor" .
   1. If the resistance is less than 5 Ω, repair the short between pins 87 and 102 of the 120–pin MCM connector.Refer to "112.3.1.1 Verify Repairs" .
      

      Figure 1. Intake Manifold Pressure Sensor

   2. If the resistance is greater than 5 Ω, repair the short to power on pin 87 of the 120–pin MCM connector. Refer to "112.3.1.1 Verify Repairs" .

Section 112.3.1.1
Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.