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The Terminator
Engine/Tuning
Help troubleshooting radiator fan not coming on while driving
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<blockquote data-quote="TheFleshRocket" data-source="post: 17035630" data-attributes="member: 48535"><p>I did some testing by setting the fan speeds in a "base" tune I had on the device. (Canned tune support is disabled, but I had one "base" tune that does let me change parameters.) </p><p></p><p>Basically, whenever the coolant temp is below the high-speed fan temp, the fan runs in low-speed mode. As soon as the high-speed fan temp threshold is passed, the fan shuts off.</p><p></p><p>It appears that my regular tune has the low-speed fan turn on somewhere in the 170s, with the high-speed fan set to turn on at 190. The fan runs until the temp hits 190 and then shuts off. </p><p></p><p>Looking at the wiring diagram, as far as I can tell, the only thing left that could be causing the problem is the light green / violet wire that goes between the high-speed relay on the CCRM and the high-speed fan controller on the ECM itself. I'm guessing I should check for continuity between the ECM and the CCRM on that wire. </p><p></p><p>Or I should disconnect the fan harness, let the engine get up to 190F, and see what I see on the high-speed fan wire. The reason I haven't done that yet is the engine has huge aftermarket reservoirs for the engine and intercooler coolant and in order to get to the fan harness, I have to push them out of the way (not easy when they're full of hot fluid, and they usually get pressed up against the engine.. can't do that when the belts are spinning).</p></blockquote><p></p>
[QUOTE="TheFleshRocket, post: 17035630, member: 48535"] I did some testing by setting the fan speeds in a "base" tune I had on the device. (Canned tune support is disabled, but I had one "base" tune that does let me change parameters.) Basically, whenever the coolant temp is below the high-speed fan temp, the fan runs in low-speed mode. As soon as the high-speed fan temp threshold is passed, the fan shuts off. It appears that my regular tune has the low-speed fan turn on somewhere in the 170s, with the high-speed fan set to turn on at 190. The fan runs until the temp hits 190 and then shuts off. Looking at the wiring diagram, as far as I can tell, the only thing left that could be causing the problem is the light green / violet wire that goes between the high-speed relay on the CCRM and the high-speed fan controller on the ECM itself. I'm guessing I should check for continuity between the ECM and the CCRM on that wire. Or I should disconnect the fan harness, let the engine get up to 190F, and see what I see on the high-speed fan wire. The reason I haven't done that yet is the engine has huge aftermarket reservoirs for the engine and intercooler coolant and in order to get to the fan harness, I have to push them out of the way (not easy when they're full of hot fluid, and they usually get pressed up against the engine.. can't do that when the belts are spinning). [/QUOTE]
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Help troubleshooting radiator fan not coming on while driving
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