Check/replace the engine coolant temp sensor with a new brass one NOT the factory plastic one, and also replace the pigtail wires to it, they can corrode and cause issues.
SOURCE: My 2001 Santa Fe failed inspection because of
Hi,
it wouild appear from your description that the engine coolant sensor is developing values in excess of it's set parameters.
Having said that. I would check the connection to the sensor to ensure there is no high resistance, clean the connection anway, refit it, then have a local auto parts shop re-check the codes for you. If the code read-out remains the same. IIt would indicate a faulty coolant sensor.
Good luck.
SOURCE: p0118 engine coolant temp circuit high input what
A code P0118 may mean that one or more of the following has happened:
A bad connection at the sensor
An open in the ground circuit between the ECT sensor and the PCM
A short in the voltage feed between the sensor and the PCM
A bad PCM (less likely)
A bad temperature sensor (shorted internally)
Possible Solutions
First, if you have access to a scan tool, check the reading of the coolant sensor. Does it read a logical number? If so, the problem is likely intermittent. Perform a "wiggle" test by wiggling the connector and harness to the sensor while watching the reading on the scan tool. Watch for any drop-outs. Drop-outs would indicate a bad connection. If the scan tool reads an illogical temperature, check the resistance of the temperature sensor. If it is out of specs, replace it. If it is in specifications, unplug the sensor and, using a fused jumper wire, jumper the two terminals of the connector together. The temperature reading should now be maxed out to above 250 degrees F. If not, there is likely a problem with the ground circuit or voltage supply.
Check for 5 volts reference voltage at the connector. Also check for ground presence at the connector. If you do not have 5V ref. and/or ground continuity, check for these back at the PCM connector. If you have these at the PCM connector, then repair open or short between the PCM and the sensor. If you do not, remove the offending wire from the PCM and then check for proper voltage at the PCM pin. If it's present now, repair short on the circuit. If it isn't present after removing the wire and checking the pin, replace PCM
NOTE: Usually, P0118 is indicative of a bad temperature sensor, but doesn't rule out these other possibilities. If you're unsure of how to diagnose a PCM, do not attempt.
SOURCE: trouble code p0118 for a 1999 ford escort se ,
This may caused by bad connection at the sensor, short in the voltage feed between the sensor and the PCM, bad PCM, open in the ground circuit between the ECT sensor and the PCM, bad temperature sensor.
You see more here:
http://www.fixya.com/cars/t5027589-1998_honda_accord_code_po118
SOURCE: P0118 Engine Coolant Temperature Circuit High
check out hmaservice.com you should find what yoir looking for there
Here is a picture, it is in the cylinder head. It has an oval shaped connector.
Symptoms of a P0118 could include:
A code P0118 may mean that one or more of the following has happened:
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