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Posts Tagged: P1489

P1489 and overheating 300M

 Fix code P1489 and overheating 300M Owners who have an P1489 and overheating 300M with trouble code  High Speed Fan CTRL Relay Circuit, here’s what to do. Remove the high speed fan relay and use a digital multimeter to check for power on the two terminals of the electrical connector. If you show power, reinstall the relay. Then ground the dark blue/light green wire at pin 69 of the PCM. The relay should click. If it doesn’t try swapping in a new relay or run a continuity test on the … Read More

P1489 High Speed Fan CTRL Relay Circuit

P1489 High Speed Fan CTRL Relay Circuit If you have a P1489 High Speed Fan CTRL Relay Circuit trouble code, this post will help you understand what it is and how to fix it. The high speed on the radiator cooling fan is turned on and off by a relay. The PCM has detected a problem in the control portion of this relay. The control portion is the magnetic coil that moves the contacts to open of close–the contacts that feed power to the high speed side of the cooling fan. … Read More


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