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Bad pump or a leak. Pull the lines fro the rear air shocks, Fell for pressure build up in the line. Find the pump, and check pressure there also. No pressure at the pump, it's bad. Pressure at the pump, but not at the shocks, bad line. Pressure at the shock line, bad shocks.
Raise the rear wheel off the ground and then with a no loss air pump apply more pressure to force any oil down the lines into the shocks, then release all air pressure and press the air line fitting collar in and disconnect the lines. THEN remove the upper shock mounting bolt and lockwasher and flat washer and then remove the lower shock mounting bolt and lockwasher and flat washer and remove the shock absorber assembly from the motorcycle. BUT do not lay it down as the oil will leak out and cannot be replaced so the shock would then be garbage. You could remove the air line fitting and plug the hole with a 1/8 NPT thread plug if the shock is to be retained and stored or etc.
Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .
The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.
It is possibly located under either one of the front guards, I had a 1990 ford fairlane (Australian) and that is where the Air Ride compressor was located in that.
They usually run dry and wont pump the Air into the system, I removed the 2 rear Air Shocks from mine and replaced them with normal air shocks that you pump up at the garage and never had any more trouble.
You do not have to put any air in the forks. There was a sticker telling you maximum pressure on the bike. It may still be there. Maximum pressure is not more than 14 pounds. You will never need more than 7 or 8 pounds. First set the rear shocks for a hard or soft ride. Then holding a bicycle foot pump with a pressure gauge on it in your hands , give it one pump (do not go over 10 or 12 pounds pressure). Now bounce on the seat and bleed pressure out of the forks until the front and rear shocks drop at the same time. Your bike suspension is now set up correctly for riding.
Too many possible causes (fuel, fuel pump (pressure, injectors, etc), ignition, crank sensor, Mass Air Flow Sensor, Coolant Temperature Sensor, ECU, etc.
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