4000 Error Messages and Troubleshooting
Service Manual 2-1
2. Error Messages and Troubleshooting
2.1 4-/5-Gas Measuring Instruments Unit
2.1.1 Gas Flow Insufficient
Check the following:
• Is the exhaust gas probe nozzle blocked?
− Clean the probe out with compressed air.
CAUTION - before doing so, always disconnect the probe from the tester!
• Is the measurement gas outlet blocked?
• Is the flexible probe hose kinked or is there a heavy object on the hose that is stopping
the gas flow?
• Check the paper filter in the filter housing
− If the filter is black, replace it.
− Always carry out a leak test after replacing a filter.
If the above measures do not solve the problem, the hose system must be blocked (in the
measuring instruments unit) or the pump is defective.
Remove the measuring instruments unit (see Dismantling the 4-/5-Gas Measuring
Instruments Unit) and check the hose system and pump (see 4-/5-Gas Measuring
Instruments Unit).
A soiled filter can cause soiling or even damage to the
measurement cell.
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