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Engine/Tuning
Help troubleshooting radiator fan not coming on while driving
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<blockquote data-quote="TheFleshRocket" data-source="post: 17035457" data-attributes="member: 48535"><p>I found this thread: <a href="https://stangnet.com/mustang-forums/threads/03-radiator-fan-wont-turn-on.911298/" target="_blank">https://stangnet.com/mustang-forums/threads/03-radiator-fan-wont-turn-on.911298/</a></p><p></p><p>I also looked up the fan wiring diagram in the service manual.</p><p></p><p></p><p></p><p>Interestingly, it states that checking for power at the fan plug, either low speed or high speed should be on, but not both. So if I get power at the low-speed side, then I shouldn't be getting power at the high-speed side. What this means is that if I am getting power to the low-speed fan side when doing an ECM flash, I shouldn't be getting power to the high-speed fan side (corroborating what 01yellercobra said), and meaning that the ECM flash isn't a valid test of the high-speed fan activation.</p><p></p><p>I used a 12V test light and checked the two yellow / black wires going into the CCRM which are supposed to be hot at all times, and they both are.</p><p></p><p>I used an ohmmeter and checked the two orange / blue wires going into the CCRM which are supposed to have continuity to the high-speed side of the harness plug, and they do.</p><p></p><p>I checked the two red / orange wires going into the CCRM which are supposed to have continuity to the low-speed side of the harness plug, and they do. </p><p></p><p>So, the CCRM has power going to both of its internal fan relays (2 x yellow / black wires), the wiring from the CCRM to the low-speed fan harness is good (2 x red / orange wires), and the wiring from the CCRM to the high-speed fan harness is also good (2 x blue / orange wires). </p><p></p><p>Looking at the wiring diagram, the only other wiring that should affect the high-speed fan activation is the light green / violet wire between the PCM (the high-speed fan controller) and the CCRM. </p><p></p><p>At this point, I think I may not have been properly testing the CCRM via the ECM flash, so it's possible that the old CCRM's high-speed fan relay is indeed bad. I'm going to reinstall the new CCRM and take the car for a test drive tomorrow.</p></blockquote><p></p>
[QUOTE="TheFleshRocket, post: 17035457, member: 48535"] I found this thread: [URL]https://stangnet.com/mustang-forums/threads/03-radiator-fan-wont-turn-on.911298/[/URL] I also looked up the fan wiring diagram in the service manual. Interestingly, it states that checking for power at the fan plug, either low speed or high speed should be on, but not both. So if I get power at the low-speed side, then I shouldn't be getting power at the high-speed side. What this means is that if I am getting power to the low-speed fan side when doing an ECM flash, I shouldn't be getting power to the high-speed fan side (corroborating what 01yellercobra said), and meaning that the ECM flash isn't a valid test of the high-speed fan activation. I used a 12V test light and checked the two yellow / black wires going into the CCRM which are supposed to be hot at all times, and they both are. I used an ohmmeter and checked the two orange / blue wires going into the CCRM which are supposed to have continuity to the high-speed side of the harness plug, and they do. I checked the two red / orange wires going into the CCRM which are supposed to have continuity to the low-speed side of the harness plug, and they do. So, the CCRM has power going to both of its internal fan relays (2 x yellow / black wires), the wiring from the CCRM to the low-speed fan harness is good (2 x red / orange wires), and the wiring from the CCRM to the high-speed fan harness is also good (2 x blue / orange wires). Looking at the wiring diagram, the only other wiring that should affect the high-speed fan activation is the light green / violet wire between the PCM (the high-speed fan controller) and the CCRM. At this point, I think I may not have been properly testing the CCRM via the ECM flash, so it's possible that the old CCRM's high-speed fan relay is indeed bad. I'm going to reinstall the new CCRM and take the car for a test drive tomorrow. [/QUOTE]
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Help troubleshooting radiator fan not coming on while driving
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