■ CAUTION: In the event of physical damage, mechanicaldefects or readings outside tolerance, replacethe part without delay.- Inspection for physical damage- check for pneumatic passageDisconnect the pressure connection lines. See 73-00-00sec. 2.7.- check the mixture enrichment (dynamic)To do so, fit a T-fitting into line between solenoid valve andfloat chamber to facilitate the measuring by pressure gaugeof the pressure at airbox pressure exceeding 1250 hPa.The T-fitting may remain in place, but for standard operation it must be securely closed.Measure the resistance between the two terminals (2):- Disconnect plug connection with wiring harness butreestablish immediately after completion of checkand verify tight fit and engagement of catch.- resistance at 20 °C (68 °F): 28.3 to 31.1 Ω(older model version)- resistance at 20 °C (68 °F): 22 to 25 Ω(newer model version)