Ford focus 1.8tdci glow plug light only staying on for about 1sec in sub zero temperatures

Maybe sticky relay, the relay times out when the glow plugs reach temperature, if the relay is sticking then light will stay on and so will glow plugs if they have not burnt out

What about the glow plug controller? What about the engine temperature sensor for the glow plug system?

It may, depending oln the temperature of the engine. A cool night could bring engine temp down low enough to require some pre heat, for example.

Check for fuses first. The Glowplug timer is the proper name for the part that responds to Temperature when starting your engine. When the engine is cold, of course it is on longer and can cycle making a click and intermittently dimming the lights on your truck. When the engine is warm, your gowplugs may not even fire as the engine is using compression alone to fire up.

Also, Ford did make a Severe Weather model that kept the glowplugs on longer. If you stay in Alaska or a climate with consistent subzero temperatures you may need it.

Glow plug light? I didnt know Ford made a Diesel Focus?

only takes one glow plug out of order to cause problems . check them for proper volatge and resistance

u should check for a coolant leak just above the starting motor, it makes its way into the motor gumming every thing up ,coolant leak is usually from the thermostat housing.

You have to check if you really glows comes to power that can show you the light on the dash that are working and maybe the relay of the glows does not work and you will pass voltage. Try a thick cable you put something in the battery positive and the other end touch the tip of the glow should produce a spark pquena holds about 20 or 25 seconds and give him star should work well. Thanks

See 3rd dot point. It sounds like transmission fluid is getting hot and triggering the warning light. Check fluid level. Check trans cooler and cooler lines to be sure trans fluid is flowing through cooler to transmission. Transmission fluid temperature (TFT) sensor
The TFT sensor is located on the internal wiring harness to the solenoid valves in the fluid pan.
It is a resistor and measures the transmission fluid temperature.
The transmission fluid temperature is used by the PCM for the following functions:

• Applying the torque converter clutch is not permitted until the transmission fluid reaches a certain temperature,
• engagement of 4th gear is prevented in extreme sub-zero temperatures until the normal operating temperature is reached,
• if the transmission fluid temperature is excessive, a pre-set fixed shift curve is selected and the torque converter lock-up clutch is closed in "2", "3" and "4"; of the transmission warning indicator is activated. No substitute signal is available for the TFT sensor.

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Hi, if the egnine start alright. then it will be the LED or just a blub need replacing.