Thermo Time Switch

Engine temperature must be less than 86°F (30°C). Disconnect cold start valve wiring harness connector and attach LED test light to terminals. Have assistant hold ignition switch in START position while observing test light.
Test light should stay on for 3-8 seconds depending on coolant temperature. If test light does not come on, check voltage supply to cold start valve and repair as necessary. If voltage to cold start valve is okay, check ground circuit through thermo time switch. Replace thermo time switch if contact to ground cannot be made.