Source: http://support.delorean.com/kb/a60/c...rt-issues.aspx
Thermo Time Switch Diagnostics:
Testing the TTS is a bit counterintuitive as it appears to have two connection pins but actually uses engine ground as a third connection. To test with an ohm meter, set the meter to a low (Rx1) range. Unplug the TTS and note that there are two pins on the connector. One of these pins is the connection to the heater, the other is the connection that grounds the Cold Start Valve when cold. The heater should measure about 50 ohms to ground, and the switch connection should measure a dead short (0 ohms) to ground when cold and open (infinite) to ground when hot. NEVER apply a test voltage to the TTS.