Espar heater problems, glow pin issues

jaielv · Dec 15, 2018

danielmarsh said: ↑

Ive had tons of issues trying to get my espar to work again. When you turn it on nothing happens. After checking resistances it seemed like the glow pin was barely out of spec, so I replaced it and the screen. Didn’t fix it. I then settled for getting the ecu reader thinking I had a locked ecu. I got error codes 20 (glow pin open circuit) and 21 (glow pin short circuit.) Naturally i found this very confusing so I replaced the ecu thinking it had to be bad with those codes. Now with the new ecu I am still getting code 21. What in the world is going on?

The new glow pin has an acceptable resistance. There’s no problem with the wires. In fact, they’re all new now up to the harness connecter with all of the replaced parts. On a hunch I checked for continuity between the glow pin and the housing thinking a short could exist there but I didn’t find any.

I’ve spent over $600 on parts and readers trying to figure this out and I am at a loss for words. All of the circuits are internal to the ecu, which is new. The glow pin reads fine from the harness. What else could it be? Is some weird short circuit condition happening on the negative side that’s blasting the glow pin? I checked the positive and negative terminals on the ecu harness and there’s no short circuit there. The fuel pump has a normal resistance.

Please help, I’m going crazy over this.
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jaielv · Dec 15, 2018

I know you probably got it going by now.but just incase did you check to see if power was going into the blower motor when on? I had the same issue and found to have a shorted out blower motor.I replaced it and working good then I opened the old motor and found it was full of carbon so that indicates exhaust was getting into the motor. Just bought my truck so I didn't know the maintenance history on this but its important to do a tune up on this heaters every year including internal gaskets

Tinybird · Jan 16, 2019

What was result?

Onemanshow · Jan 16, 2019

Would be easier to order Chinese clone for cad150 of ebay. They work great

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