Section 110.2 SPN 3509/FMI 4

Section 110.2
SPN 3509/FMI 4

This diagnosis typically means the 5 V sensor supply bank 1 circuit failed low.‪

This fault indicates that the MCM detects a short to ground (voltage < 4.7) on either of the MCM pins listed in Table "MCM Pins for Short to Ground Check" .‪


MCM Pin‪

Charge Air Cooler Outlet Pressure Sensor‪


Inlet Air Delta P, Intake Throttle Valve‪


Table 1. MCM Pins for Short to Ground Check

Inspect the harness and repair as necessary. Refer to "110.2.1 Verify Repairs" .‪

Section 110.2.1
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.

EPA07 DD15 Troubleshooting Guide - DDC-SVC-MAN-0029
Generated on 10-13-2008

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