YES -
Go to step 2.
NO -
Repair the brake system, then recheck.?
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Test-drive the vehicle in a straight line. Accelerate the vehicle up to 6 mph (10 km/h), and stop, then accelerate up to 6 mph (10 km/h).
5. Check for DTCs with the HDS.
Is DTC 91 indicated?
YES -
Go to step 6.
NO -
If any DTCs are indicated, go to the indicated DTCs troubleshooting. If DTCs are not indicated, intermittent failure, the system is OK at this time.
Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to intermittent failures
troubleshooting.?
6. Update the VSA modulator-control unit if it does not have the latest software See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Traction Control Module/Testing and Inspection. If the unit already has the latest software, substitute a known-good VSA
modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Traction Control Module/Service and
Repair.
7. Test-drive the vehicle in a straight line. Accelerate the vehicle up to 6 mph (10 km/h), and stop, then accelerate up to 6 mph (10 km/h).
NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS.
Is DTC 91 indicated?
YES -
Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If the VSA modulator-control
unit was updated, substitute a known-good VSA modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control
Systems/Traction Control Module/Service and Repair, then retest. If the VSA modulator-control unit was substituted, go to step 1.
NO -
If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the
original VSA modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Traction Control
Module/Service and Repair. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.?
91-1
SH AWD DTC Troubleshooting: 91-1
DTC 91-1:
SH-AWD Control Unit Programming Error
NOTE:
- Before you troubleshoot, review the general troubleshooting information See: Transmission and Drivetrain/Differential Assembly/Testing
and Inspection/Initial Inspection and Diagnostic Overview.
- 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.
1. Turn the ignition switch to ON (II).
2. Do the SH-AWD system update procedure See: Powertrain Management/Transmission Control Systems/Relays and Modules - Transmission
