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#1
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Location of engine coolant temperature sensor
I have a 1993 300E with 104 engine. This is the same engine as the 94-5 320E.
Can someone tell me where the engine coolant temperature sensor is located. Is it east to get to? If anyone can provide a picture, that would be great. Does the sensor connect to the engine wiring harness? How many prongs are on that connector? |
#2
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There are 3 coolant temp sensors ..which one are you concerned with???
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A Dalton |
#3
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The ECT that I am looking for is the one that causes 2 flashes "ECT sensor" on the code reader while testing Pin 8 ECU.
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#4
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Side mounted sensor under thermo housing
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42DW029DXP&year=1993&make=MB&model=300-E-004&category=C&part=Water+Temp.+Sensor
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A Dalton |
#5
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Thanks, Arthur.
If this ECT sensor is bad, would it cause cold start problems and bad gas mileage. Is the Pin to test emissions on Pin 6? |
#6
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Does car have a CE light?
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A Dalton |
#7
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Can I test the ECT sensor with a ohm meter?
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#8
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No CE light on the instrument cluster.
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#9
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Yes , it is a Negative thermistor.....
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A Dalton |
#10
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Then the car is FED version and has no Emmissions Module [ N/59]
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A Dalton |
#11
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I am planning to change the ECT sensor but in the meantime should I do the following:
a) disconnect the ECT sensor (infinite resistance) b) disconnect the ECT sensor and bridge the 2 female connectors on the wiring harness (0 resistance) c) leave the ECT sensor connected to the wiring harness This is what I am currently experiencing: In the morning, car needs about 4 or 7 cranks with engine stumbling and dying before the engine warms up enough. After that car runs well. In the after noon, car needs about 2 cranks before the car starts. When the engine is warmed up, car runs suprising well. |
#12
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Unplug the sensor, clean the terminals , replug it, clear the code and run it. See if code returns.
I would also ohm it to make sure it is not Open. ..and check the insulation on the plug........................
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A Dalton Last edited by Arthur Dalton; 06-04-2008 at 01:51 AM. |
#13
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Good suggestion. I will try that tomorrow.
On this car, the only pins that can be read using the code reader is 8, 14. Does pin 6 test for anything? I got 1 flash. |
#14
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SRS -N/2 module
1 flash is no codes
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A Dalton |
#15
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Thanks, Arthur for the tips.
I tested the ECT sensor and it apprears to be good (250 ohms at 60 degrees). The connector has 3 holes and only 2 holes with wires connected to it. The 2 wired holes tested negative for a short so insulation must still be good for now. My problem was that the 2 wired holes were not connected to the pins on the sensor. It is easy to line up the wrong holes to the pins. I reattached the sensor correctly and reset pin 8 with the code reader. Hopefully, tomorrow the cold start and stumbling go away. |
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