Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name is ***** ***** I can assist you with your question. Can I start by getting your VIN and the code number stored in the computer? Thank you!
Hello and sorry for the delay! Thank you for getting me that information. Here is some information for this code according to the VIN.
P1289 Cylinder Head Temperature Sensor Circuit High Input
Engine coolant level is too low or the thermostat has failedCHT sensor has failedCHT sensor connector is damaged (check pins for damage, and for moisture)CHT sensor ground circuit is openCHT sensor circuit is open or shorted to voltage (may be an intermittent fault)
Code P1289 indicates that the CHT sensor input is intermittently rising above 4.6 volts. This would be the equivalent of an open circuit or connection type problem. The instrument cluster receives engine temperature information from the PCM on this vehicle to control the gauge display function.
Here is how to check the circuit. Disconnect the connector and turn the key on. Check for voltage on the Yellow/Light Green wire that goes to pin 41 of the PCM. This should have approximately 4.7-5.0 volts on it Key On Engine Off. If there is no voltage, check/repair the open circuit between C1033 and pin 41 of the PCM. If there is good voltage, check for a good ground on the Gray/Red wire as this grounds out at pin 58 of the PCM. If there is no ground supplied to the sensor, the Cylinder Head Temperature sensor voltage will be too high and cause the code P1289.
Here is a wiring diagram of this circuit.
Hello and sorry for the delay! I was off line eating with the family. YES, you can check it once all of the electrical is hooked up before installing the intake manifold and everything else.
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