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Low coolant light

Tiny
ROYBLIZ
  • MEMBER
  • 2002 SATURN SC2
  • 1.9L
  • 4 CYL
  • FWD
  • MANUAL
  • 155,000 MILES
The low coolant light is on and I have done the following:
1) new tank
2) new CTS
3) unplugged tank checked still on
4) put jumper wire on plug still on

I am stumped, figure it is a wire issue or ECM or PCM, please help
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Sunday, December 20th, 2015 AT 6:05 AM

9 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Use a volt-ohm meter to check continuity between the sensor and ECM, then check to ensure the sensor has voltage.
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Sunday, December 20th, 2015 AT 8:34 AM
Tiny
ROYBLIZ
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  • 5 POSTS
Do you know what wire(or is it the same color) it is at the ECM? Also is the ECM above the transmisson?
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Sunday, December 20th, 2015 AT 10:27 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Just to add to this one if you jumped the connector to the bottle and it's still on?I would see if the back up fuse is blown in the underhood fuse box?The first one I saw like that I was puzzled also but found out there was a blown back up fuse.
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Tuesday, December 22nd, 2015 AT 3:23 PM
Tiny
ROYBLIZ
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  • 5 POSTS
SaturnTech9; I checked the fuse and sure enough it was blown. I haven't had the chance to replace it and test, but I am SO THANKFUL for your insight into this.
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Wednesday, December 23rd, 2015 AT 5:44 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Yeah I worked for Saturn as a tech for over 16yrs so I have a lot of insight on things on these cars most people wouldn't have.I Still have a Saturn I have a 1999 Saturn sl2 I love the S model Saturn's. Let me know what you find you probably have a bad back up light bulb. That blew the fuse.
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Wednesday, December 23rd, 2015 AT 7:45 PM
Tiny
ROYBLIZ
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  • 5 POSTS
The fuse was blown, put in another one it blew, messed with the wires, not sure what I did but now the fuse is fine, jumpered the connector to backup light switch and turns out the switch is bad. I ordered it and we will see how it works after I get that put in.
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Thursday, December 24th, 2015 AT 2:04 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Yeah it's common for those manual transmission back up switches to go bad.I have never seen one go bad and blow the fuse.
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Thursday, December 24th, 2015 AT 7:55 PM
Tiny
ROYBLIZ
  • MEMBER
  • 5 POSTS
Ok, the end result was the backup light switch was bad. I ordered one, once I put it in, the backup lights work, and the low coolant light is no longer on. You ROCK! Thanks so much.
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Wednesday, January 6th, 2016 AT 7:48 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Your welcome thanks for update glad I could help.
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Wednesday, January 6th, 2016 AT 8:25 PM

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