6.5 Electrical Tests (CIS-E Motronic)
Two types of electrical tests are described here. First, several of the electronic control functions can be checked and evaluated by measuring voltage signals or differential pressure regulator current under different running conditions. Tests measuring differential pressure regulator current require connecting an ammeter in series with the differential pressure regulator. See Differential Pressure Regulator under 6.1 Air Flow Measurement and Fuel Metering.
Next are the voltage and continuity tests listed under Control Unit Inputs. These can be used to help determine whether there are faults in the wiring or in the components which provide input to the control unit. If all control unit inputs are found to be correct and the system does not perform as specified, the control unit itself may be faulty.
CIS-E Motronic is equipped with built-in fault diagnosis circuitry which can detect and report component faults electronically. This electronic check of the system is strongly recommended by Volkswagen as the first step in any CIS-E Motronic troubleshooting. It is most certainly recommended for any car that is still protected by Volkswagen's extensive warranty coverage. For more information, see 3.4 CIS-E Motronic Fault Diagnosis.
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