Download Note: Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) Sensor G40 . Special tools, testers and auxiliary items required Multimeter . Wiring diagram. Test requirements The Motronic Engine Control Module (ECM) J220 fuses OK. Battery voltage at least 12.5 volts. All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into position “P” or “N” . A/C switched off. Ground (GND) connections between engine/transmission/chassis OK. Ignition switched off. Test procedure Perform a preliminary check to verify the customers complaint. Refer to Diagnosis . Start diagnosis Remove the engine cover. Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector – arrow – . Switch the ignition on. Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector terminals 1 to 3 for voltage. Specified value: at least 4.5 V Switch the ignition off. If the specification was not obtained: Checking wiring If the manufacturers test box is being used.