MBE 900 DDEC VI Troubleshooting – Section 99.1 SPN 2797/FMI 3

Section 99.1
SPN 2797/FMI 3

This diagnosis is typically injector control valve cylinder #1, 2, or 3 circuit has a short to battery/power.‪

Section 99.1.1
Short to Battery/Power Check

Check as follows:‪

  1. Disconnect the 12–pin injector valve cover harness connector.
  2. Turn the ignition ON (key ON, engine OFF).
  3. Measure the voltage between pin 1 on the engine side of the valve cover injector harness connector and ground.
    1. If voltage is present, repair the short to power between pin 1 of the valve cover injector harness connector and pin 26 of the MCM 120–pin connector. Refer to "99.1.1.1 Verify Repairs" .
    2. If no voltage is present, go to the next step.
  4. Measure the voltage between pin 3 on the engine side of the valve cover injector harness connector and ground.
    1. If voltage is present, repair the short to power between pin 3 on the engine side of the valve cover injector harness connector and pin 22 of the MCM 120–pin connector. See Figure "Injectors #1, 2, and 3" . Refer to "99.1.1.1 Verify Repairs" .
      2. Click to see this graphic in a separate window

      Figure 1. Injectors #1, 2, and 3

    2. If no voltage is present, go to the next step.
  5. Measure the voltage between pin 5 on the engine side of the valve cover injector harness connector and ground.
    1. If voltage is present, repair the short to power between pin 5 on the engine side of the valve cover injector harness connector and pin 24 of the MCM 120–pin connector. See Figure "Injectors #1, 2, and 3" . Refer to "99.1.1.1 Verify Repairs" .
    2. If no voltage is present, replace the under valve cover injector harness. Refer to "99.1.1.1 Verify Repairs" .
Section 99.1.1.1
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.

EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580
Generated on 10-13-2008