Question about Cars & Trucks
When you start the car fan comes on in seconds have changed the engine coolant temperature sensor which solved the problem for 3 days then the same problem returned.
Pauline, a code P0118 may mean that one or more of the following has occurred: 1) A bad connection at the sensor 2) An open in the ground circuit between the temp. sensor and the powertrain control module (PCM) 3) An open or short in the voltage feed between the sensor and the PCM 4) A bad PCM (unlikely) 5) A bad temperature sensor. I would first check that you have a good connection at the sensor. If you have a digital voltmeter, you can also check to see if you are getting the proper signal to the sensor (with the ignition ON). One connector terminal should read 5 volts, and the other should be grounded. If you have neither one or the other, then you need to check the wiring back to the PCM. Check for broken or shorted wires. Also check for the 5 volts and ground at the coolant sensor PCM connection. If the correct reading are not present at the PCM, then the PCM needs to be repaired or replaced. An expensive proposition, I'm afraid.
Posted on Feb 13, 2014
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Posted on Jan 02, 2017
this is the coolant temp sensor, it sends a signal to the engine ECU
this is the temp sending unit. it sends a signal to the gauge on the instrument panel.
this is what you need to get to fix your temp gauge.
Posted on Oct 15, 2008
Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson
Posted on Feb 04, 2009
sometimes the radiator is just too plugged to respond to flushing. (happens a lot with a marginal radiator because when flushing, the solvent simply goes around the plugged area, and cannot build up enough force to break it free). From what you have written, this may be the case. Is the electric fan coming on and off at the right times? if not this also can give you similar problems. You have done the right things but may not have gotten the desired result. Hope this info helps you a bit.
Posted on Apr 03, 2009
SOURCE: Code P0133-02 (o2 sensor slow
just because you have a slow response code does not mean that you have a bad sensor, the slow response code is just telling you that the fuel system is very slow to respond to fuel delivery changes, this could be caused by many different things it could be as simple as the oil is contaminated with fuel, it could also be a problem with the fuel pressure, could also be a vacuum leak. the fact that you keep getting the same code with different sensors tells me that the problem is not the sensor but the fuel injection system. there is a flow chart for the fuel system and i am afraid you are going to have to have someone run a diag. check on the fuel system.....SORRY
Posted on Jan 13, 2011
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The reference values given below are measured between ECM terminal 72 and ground...
When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.
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.
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