ATTESA is the GT-R's four-wheel-drive system, and HICAS is its four-wheel steering. Both have warning lights and self-diagnosis. Have any fault confirmed by a specialist.
Reading ATTESA codes
Follow the factory service manual for your car to read ATTESA fault codes, or have a specialist read them.
HICAS self-test
HICAS has a self-diagnosis mode started by a set steering and brake sequence. Follow the procedure in the factory service manual for your car.
HICAS lock bars
A HICAS lock bar locks the rear steer. Tell your insurer about any modification, and check with your MOT tester before you lock out or remove a system.
Aftermarket ECU control
The Haltech Nexus plug-in ECU can take over ATTESA control.
Haltech Nexus plug-in | Haltech Nexus S3 adapter kit | Haltech vs Link plug-in ECU | Skyline drivetrain
FAQ
How do I read ATTESA fault codes?
Follow the factory service manual for your car to read ATTESA fault codes, or have a specialist read them.
Do I need to declare a HICAS lock bar?
Tell your insurer about the modification and check with your MOT tester.
Can an aftermarket ECU control ATTESA?
The Haltech Nexus plug-in can take over ATTESA control.