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 OFF while updating the SH-AWD system. If you turn the ignition switch OFF before completion, the SH-AWD system can be damaged.
- Do the SH-AWD system update procedure (see UPDATING THE SH-AWD CONTROL UNIT ).
- 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 UPDATING THE SH-AWD CONTROL UNIT ), 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.