DTC 91-1: SH-AWD Control Unit Programming Error
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- DTC 91-1 is stored when the SH-AWD system update is not completed.
- Do not turn the ignition switch to LOCK (0) while updating the SH-AWD system. If you do, the SH-AWD system can be damaged.
- Turn the ignition switch to ON (II).
- Do the SH-AWD system update procedure (see SH-AWD® CONTROL UNIT UPDATE ).
- Check for DTCs with the HDS.
Is DTC 91-1 indicated?
YES -Update the SH-AWD control unit if it does not have the latest software (see SH-AWD® CONTROL UNIT UPDATE ), or substitute a known-good SH-AWD control unit (see SH-AWD® CONTROL UNIT REPLACEMENT ), and recheck. If the symptom/indication goes away with the updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good SH-AWD control unit, replace the original SH-AWD control unit (see SH-AWD® CONTROL UNIT REPLACEMENT ).
NO -Update is complete.