Honda Accord 2008 Manual page 2355

07/11/02 09:41:44 61TA0000_220_0325
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DTC Troubleshooting (cont'd)
DTC U0029: F-CAN Commuication Line Error
NOTE:
• Make sure the HDS communicates with the ECM/PCM
and other vehicle systems. If it does not, go to DLC
Circuit Troubleshooting (see page 11-208).
• If you are troubleshooting multiple DTCs, be sure to
follow the instructions in B-CAN System Diagnosis
Test Mode A (see page 22-120).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back
to ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS.
Is DT C U0029 indicated?
−
YES Go to step 5.
NO − Intermittent failure, the F-CAN
communication line is OK at this time. Check for
DTCs in the ECM/PCM with the HDS. If F-CAN DTCs
are present, check for loose or poor connections at
the gauge control module and the ECM/PCM. If the
connections are good, check the battery condition
and the charging system, then clear all DTCs.
5. Check for DTCs in the ECM/PCM with the HDS.
Are any DT Cs indicated?
YES − Go to the indicated ECM/PCM DTC's
troubleshooting.
−
NO Go to step 6.
6. Do the gauge control module input test.
Are all inputs OK ?
−
YES Go to step 7.
NO − Repair the faulty input, then recheck the
DTCs.
22-322
7. Substitute a known-good gauge control module.
8. Clear the DTCs with the HDS.
9. Turn the ignition switch to LOCK (0) and then back
to ON (II).
10. Start and run the engine for at least 5 seconds, then
turn the engine off.
11. Check for DTCs with the HDS.
Is DT C U0029 indicated?
−
YES Go to step 12.
NO − The original gauge control module is faulty;
replace it.
12. Update the ECM/PCM if it does not have the latest
software (see page 11-231), or substitute a known-
good ECM/PCM (see page 11-7).
13. Check for Temporary DTCs or DTCs with the HDS.
Is DT C U0029 indicated?
−
YES Check for poor conections or loose terminals
at the gauge control module and the ECM/PCM. If
the ECM/PCM was updated, substitute a known-
good ECM/PCM (see page 11-7), then recheck. If the
ECM/PCM was substituted, go to step 1.
−
NO If the ECM/PCM was updated, troubleshooting
is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-232).
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