DTC 91-1: SH-AWD Control Unit Programming Error
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), or press the engine start/stop button to select the OFF mode while updating the SH-AWD system. If you do, the SH-AWD system can be damaged.
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
- 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 - Substitute a known-good SH-AWD control unit (see SH-AWD® CONTROL UNIT REPLACEMENT ), and recheck. 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.