186003377 - 1042AC CHECKING POWER UPTAKE OF SOLENOID ON CYLINDER (BIPOWER)

  • Carry out the elecrical test by connecting a braid between the solenoid and its connector to supply it at 14V. Measure the current uptake usng an ammeter.
  • The current measured should be between 0.9 and 1.1 Ampere.
After any service operation or replacement that involved the seal fittings or the movement of pressurised parts, test for methane gas (CNG) leaks as follows:

  • Carry out a road test by driving for 5-10 km in methane operating mode.
  • Return the vehicle to the workshop and place on a lift.
The test should be conducted where there are no sudden variations in temperature.

  • Close the manual valves on the methane canisters in order to exclude them from the circuit.
  • Connect the diagnostic equipment to the and select the "Parameters" mode to read the high pressure value
  • Wait for 3 minutes and take another reading of the gas pressure. The final pressure reading should not differ from the initial reading (0 - 1 bar).
  • If the second reading is different from the initial pressure reading, continue the test for another 3 minutes.
1. If the pressure continues to drop, use an electronic tester to detect any gas leaks. Check each component and each individual pipe in the CNG system: cut-off solenoid on the cylinder complete with manual cut-off valve (1a, 1b and 1c), single-acting valve (1d), repressurising union complete with check valve and safety plug (1e), steel pipes (1f), pressure reducer copmlete with pressure sensor and cut-off solenoid (1g).

  • Localise the leaking system section using the electronic detector and then spread the components with a leak detection foam (to identify the exact point of the leak).
  • Check the part to find the cause of the leak (loose fittings, failure to replace sealing rings, defective part) and then carry out the repair.
  • Repeat the procedure to check for leaks until the problem is completely resolved.
2. Proceed to check the circuit and the low pressure pipes with the circuit pressurized: hose (2a), pressure/temperature sensor (2b), methane fuel manifold (2c) and methane injectors (2d).

  • Identify the leaking system section using an electronic detector as described previously and take the necessary corrective action (tighten fittings, replace sealing rings or replace the part).
  • Repeat the procedure to check for leaks until the problem is completely resolved.