Re: P0381 Glow plug circuit malfunction?????
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I checked the relay and the 2 small terminals have 12 V and the Large brown terminal has 12 V, but the Red terminal has none.
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You don't have a glow plug relay on that Excursion, They use a glow plug controller module that looks like
THIS SILVER BOX WITH FINS
The relay your checking must be for the intake manifold air heater by the color of the wires your checking. A proper scan tool is needed to check this system. If your running a chip on your X thats not compatible with the California emissions you will get that code. When my X was setting this code I found the glow plugs staying on for 3 minutes, checked using a volt meter at the glow plug not the wait to start light, every time the key was turned to run both hot and cold, not good for the glow plugs. Getting a California emissions burn on the chip took care of the problem.
I hope Jody at DP Tuner can make his F5 chips work with this glow plug controller system as well as the PATS the Excursions use as this is in the near future for me.
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2000 Excursion Limited 4x4 Dark Satin Green Arizona Beige 7.3 DIT, AXDO, 3.73 LS, DP Tuner F5, TERMINATOR II w R-IPR, Adjustable Boost Regulator, Turbomaster, EBPV Delete, Air Dog, ITP Regulated Fuel Return, Fuel Cooler, Tags 1&2, Harpooned Tank, Magnaflow XL Exhaust w Aeroturbine 4040L, Sonnax/Tricumulator, 8 Autometer Sport Comp 4 Gauge A Pillar 4 Gauge Overhead, Ford APCM, Crimestopper Remote Starter With Remote Fast Idle, Ford AIS w Zoodad, W Code Front Modified B Code Rear springs, Rancho RS9000X, Rancho 5406 Stabilizer, Hellwig Rear Sway Bar, BFG Rugged Trail TA, V10 Trans Cooler w Dual Electric Pusher Fans, Coolant Filter, IAH Delete, (((XM))) Line Of Fire Light, Ford Cab Lights, 05 Headlights w GOS Conversion Harness, Jimmi Jammers, 03 Lighted Painted Tow Mirrors w C-BETR, PSD Badges, Pullrite Hitch, Prodigy Brake Controller, Born 01/29/00