MBE 900 DDEC VI Troubleshooting – Section 84.1 SPN 1188/FMI 7

Section 84.1
SPN 1188/FMI 7

This code typically means the wastegate actuator is in Failsafe Mode, Motor On.‪

Section 84.1.1
Actuator Check

Check as follows:‪

  1. Disconnect the wastegate control actuator.
  2. Turn the ignition ON (key ON, engine OFF).
  3. Measure the voltage between pins 1 and 2 of the wastegate control actuator connector.
    1. If the voltage is greater than 11 volts, go to step 5 .
    2. If the voltage is less than 11 volts, go to the next step.
  4. Measure the voltage between pin 1 of the wastegate control actuator connector and ground.
    1. If the voltage is less than 11 volts, repair the open between pin 1 of the wastegate control actuator connector and pin 93 of the MCM 120–pin connector. Refer to "84.1.1.1 Verify Repairs" .
    2. If the voltage is greater than 11 volts, repair the open between pin 2 of the wastegate control actuator connector and pin 38 of the MCM 120–pin connector. Refer to "84.1.1.1 Verify Repairs" .
  5. Turn the ignition OFF.
  6. Disconnect the MCM 120–pin connector.
  7. Measure the resistance between pin 3 of the wastegate control actuator connector and pin 74 of the MCM 120–pin connector.
    1. If the resistance is greater than 3 Ω, repair the open between pin 3 of the wastegate control actuator connector and pin 74 of the MCM 120–pin connector.
    2. If the resistance is less than 3 Ω, go to the next step.
  8. Measure the resistance between pin 4 of the wastegate control actuator connector and pin 75 of the MCM 120–pin connector.
    1. If the resistance is greater than 3 Ω, repair the open between pin 4 of the wastegate control actuator connector and pin 75 of the MCM 120–pin connector. Refer to "84.1.1.1 Verify Repairs" .
    2. If the resistance is less than 3 Ω, replace the wastegate control actuator. Refer to "84.1.1.1 Verify Repairs" .
Section 84.1.1.1
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