Table 9. DSA Preboot messages (continued)
v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved.
v See Chapter 4, “Parts listing, Types 4255, 7945, and 7949 server,” on page 157 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a Trained
service technician.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Message
number Component Test State Description Action
166-905-xxx IMM IMM I2C Test Failed The IMM
indicates a
failure in the
HDD bus (Bus
4).
Note: Ignore the error if the hard disk drive
backplane is not installed.
1. Turn off the system and disconnect it from the
power source. You must disconnect the system
from ac power to reset the IMM.
2. After 45 seconds, reconnect the system to the
power source and turn on the system.
3. Run the test again.
4. Make sure that the DSA code is at the latest
level. For the latest level of DSA code, go to
http://www.ibm.com/support/
docview.wss?uid=psg1SERV-DSA.
5. Make sure that the IMM firmware is at the
latest level. The installed firmware level is
shown in the diagnostic event log in the
Firmware/VPD section for this component. For
more information, see “Updating the firmware”
on page 253.
6. Run the test again.
7. Turn off the system and disconnect it from the
power source.
8. Reseat the hard disk drive backplane.
9. Reconnect the system to the power source and
turn on the system.
10. Run the test again.
11. Turn off the system and disconnect it from the
power source.
12. Trained service technician only) Replace the
system board.
13. Reconnect the system to the power source and
turn on the system.
14. Run the test again.
15. If the failure remains, go to the IBM Web site
for more troubleshooting information at
http://www.ibm.com/systems/support/
supportsite.wss/docdisplay?brandind=5000008
&lndocid=SERV-CALL.
Chapter 3. Diagnostics
93
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