E-SUS · Air suspension
Infiniti QX56 and QX80 rear air suspension: tests and height calibration
The E-SUS unit stores the standard rear ride height. After replacing the height sensor, the struts or the unit itself, it has to be set again — usually by the dealer. Canfiti runs the calibration, tests the compressor and valve and shows live suspension data.
Active tests
In the “Active test” section the app drives the suspension actuators directly.
Compressor
Turn the compressor on and off to check that it pumps air. Do not keep it running for long.
Exhaust solenoid
Open the valve to release air from the system, then close it.
CK SUSP lamp
Turn the suspension warning lamp on the instrument cluster on and off to test it.
Data monitor
While the “E-SUS unit” screen is open, the app keeps reading the unit data:
- Compressor, valve and CK SUSP lamp status
- Voltage at the suspension unit
- Whether the standard height setup is complete
- Height sensor voltage and the stored value
- Ride height recognized by the unit, in millimeters
- How long the height sensor signal has not changed
- Whether the engine is running
Standard height calibration
Needed after removing or replacing the height sensor or replacing the air suspension control unit — and in practice after replacing the rear struts if the rear sits too high or too low.
- 1
Clear height setting
The car is lifted, engine running. Run the compressor for at least 60 seconds, then perform “CLEAR HEIGHT INI”. Done when the CK SUSP lamp is on.
- 2
Adjust height with no load
With the car still lifted, perform “ADJUST HEIGHT INI”. Done when the CK SUSP lamp goes off.
- 3
Standard height level
Lower the car onto its wheels and perform “STANDARD HEIGHT LEVEL”, waiting at least 120 seconds. The monitored height must be between −15 and +15 mm.
An owner’s experience
After the rear struts were replaced on an Infiniti QX80, the rear either sat at full height or dropped to the bump stops, and shops could not calibrate it without dealer software. The owner did the calibration with Canfiti and a regular Bluetooth adapter, lifting the rear left wheel — where the height sensor is — on a jack.
Verified on these vehicles
Rear air suspension tests and calibration are verified on the Infiniti QX56 and QX80 (Z62).
It also works on many other Nissan and Infiniti vehicles with a CAN bus — connect and check. If it works, tell us and we will add your model to the list.