Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 582

81.1 SPN 1172/FMI 3
1. Turn the ignition OFF. Reconnect all connectors.
2. Turn ignition ON. Clear codes with diagnostic tool.
3. Measure the voltage between pin 27 and pin 28 of the 31–pin connector on the engine side.
[a] If the voltage is less than 4.5 volts, refer to section 81.1.1, step 9.
[b] If the voltage is greater than 4.5 volts, contact the Detroit Diesel Customer Support
Center (313–592–5800) for authorization to replace the MCM.
81.1.2.1 Verify Repairs
Perform the following steps to verify repairs.
1. Turn vehicle ignition OFF.
2. Reconnect all connectors. Turn ignition ON.
3. Clear codes with diagnostic tool.
4. Start and run the engine for one minute. Stop engine.
5. Check diagnostic tool for codes.
[a] If no codes are displayed, troubleshooting is complete.
[b] If code 1172/3 is not logged, and other codes are logged, troubleshoot the logged
codes.
[c] If code 1172/3 and other codes are logged, review this section to find the error. If no
error is found, call the Detroit Diesel Customer Support Center (313–592–5800).
81-4
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. ) All information subject to change without notice.