35
8.2.1 Checking for an obstruction
In the zero-gas system:
- Open the device.
- Remove coarse filter GF 4 from hose 8.
- Press the "Pump" button.
Error message remains: Remove hose 9 from test-gas pump, press "Pump" button.
Error message remains: Perform check to Sections 8.2.2 to 8.2.4, or
Error message no longer shown: Solenoid valve is not switching over.
In this case, measure the control voltage at the solenoid valve or at connector X 5 pins 1 and 2 on the "power electronics" module:
VDC = 24V.
The solenoid valve is triggered upon each zero adjustment (approx. 30 seconds) and each time the pump is switched off following
analysis for the purpose of purging the device (approx. 15 seconds).
Control voltage OK: Replace solenoid valve.
Control voltage faulty: Check power supply to power electronics to Section 8.16.
Replace faulty components as appropriate.
In the test-gas system:
- Remove hose from the test-gas inlet.
- Press the "Pump" button.
Error message remains: Remove condensation tank, press "Pump" button.
Error message remains: Remove condensation tank, press "Pump" button.
Error message remains: Open exhaust-gas analyzer and remove hose 9 from the test-gas pump, press "Pump" button.
Error message remains: Remove hose 7 from gas and condensate pump, press "Pump" button.
If you are unable to detect an obstruction, perform the checks described in Sections 8.2.2 to 8.2.4.
8.2.2 Checking the pressure switches
Diagram, pressure switches with circuitry
Power electronics
Motherboard
To Next Page
Loading...
