Question about 1996 Saturn SL
Coolant temp sensors do occasionally die - it's probably time you replaced it. It's only a $20 part so I'd try replacing it first. If you keep getting the problem, then you need to worry about your wiring harness or ECM.
The temp sensor itself can be replaced with an OEM sensor from your local auto store. Then it's just a matter of replacing the existing sensor on your block, plugging it into the connector and hoping everything works better.
I'd recommend doing this ASAP because a problem with the temp sensor can confuse the ECM into enriching the air/fuel ratio and retarding the spark. This can lead to misfiring and can really mess up your catalytic converter if you keep allowing it to happen. Definitely cheaper to fix it early!
Hope this helps,
Posted on Dec 20, 2009
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Posted on Jan 02, 2017
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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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