Leak Checks

1. Repeat Residual Air Check steps 1, 2, 3 and 4 and allow the system to fill, until pressure gauge reads 70---100 psi. If the compressor is permitted to operate until it reaches its maximum output pressure, the vent solenoid valve will function as the relief valve. The resulting leak down when compressor shuts off will indicate a false air leak.
2. With load still applied to the vehicle, disconnect wire harness connector from the control module and then remove applied load. Vehicle rear should rise. Cycle ignition switch to OFF position.
3. Observe if pressure leaks down or holds steady (wait approximately 15 minutes) and note the following:
a. If system will not inflate beyond 50 psi, a severe leak is indicated. Check for pinched pressure line between compressor and shocks.
b. If pressure is maintained steady, perform the diagnosis procedures.
4. Connect wire harness connector to module.
5. Turn ignition switch from OFF to RUN position and allow air to exhaust (vehicle lowers).
6. After attachment of the pressure line to the dryer, repeat Residual Air Check steps 2, 3 and 4 to ensure system air pressure is within the shocks.