DTC 77-2: The Functional Abnormalities Of VSA Modulator-Control Unit
WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 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
).
- Turn the ignition switch to ON (II).
- Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
- Clear the DTC with the HDS.
- Start the engine.
- Check for DTCs with the HDS.
Is DTC 77-2 indicated?
YES -Go to step 6.
NO -Intermittent failure, the system is OK at this time.
- Check for DTCs in the VSA system with the HDS.
Are any VSA system DTCs indicated?
YES -Go to the indicated DTC's troubleshooting.
NO -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 ).