Cold Start Valve (190E 2.6L & 300 Series) Test
- Disconnect cold start injector. Connect voltmeter to cold start injector connector. Remove crankshaft position indicator plug from ignition switching unit (Green cable located on firewall) or install Protective Plug (102 589 02 21 00) on diagnostic socket.
- Check voltage while cranking starter motor. Reading should be at least 10 volts. Disconnect fuel line on cold start injector. Remove injector and reconnect fuel line. Hold cold start valve into container.
- Disconnect electrical plug at thermo time switch. Connect terminal "W" on plug to ground with jumper wire. Below 41°F (5°C), it is not necessary to ground thermo time switch connector. Start engine. Fuel spray from cold start injector should be cone-shaped. Disconnect ground test lead if used.
- Dry any gasoline from nozzle of cold start valve. No droplets should form. Remove jumper wire. Install injector with new gasket. Reconnect wiring. Install relay and reconnect fuel line.
NOTE:
During warm-up and at operating temperature, current to differential pressure regulator is determined by coolant temperature sensor, O2 sensor and ECU.