|  1. Disconnect the socket from the AKP electromagnetic valves. |    |  2. Measure resistance between each contact and "weight".  Resistance:   valves No. 1, No. 2: 12–16 Ohm  valve of adjustment of pressure: 3,3–3,7 Ohm  blocking valve: 11–15 Ohm  |       Prevention 
 Valve No. 1 (switching 1–2,3–4): To      Valve No. 2 (switching 2–3): L      Blocking valve: J      Valve of adjustment of pressure: G, N    |    | 
3. At discrepancy of values check existence of gaps or short circuits in wires. Replace valves. |     |