Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 550

75.1 SPN 729/FMI 3
8. Measure the resistance between pin 3 of the Grid Heater connector and pin 92 of the
120–pin MCM connector.
[a] If the resistance is greater than 5 Ω, repair the open between pin 3 of the Grid Heater
connector and pin 92 of the 120–pin MCM connector. Refer to section 75.1.1.1.
[b] If the resistance is less than 5 Ω, replace the Grid Heater.
75.1.1.1 Verify Repairs
Perform the following steps to verify repairs.
1. Turn vehicle ignition OFF. Reconnect all connectors.
2. Turn ignition ON. Clear codes with diagnostic tool.
3. Start and run the engine for one minute. Stop the engine.
4. Check diagnostic tool for codes.
[a] If no codes are displayed, troubleshooting is complete.
[b] If code 729/3 is not logged, and other codes are logged, troubleshoot the logged codes.
[c] If code 729/3 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).
75-4
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. ) All information subject to change without notice.