SaturnFans.com
saturnfans.com - classifieds - forums


Go Back   SaturnFans.com Forums > Models > Saturn S-Series > S-Series General

Reply
 
Thread Tools Display Modes
Old 12-07-2021, 05:53 PM   #1
Racemysaturn4me
New Member
Racemysaturn4me is on a distinguished road
 
Join Date: Oct 2021
Location: Albuquerque NM
Posts: 6

1997 SC2
Default Knock Sensor Mystery

I have a 1997 Saturn Sc2 with a check engine light issue. After checking, it showed a P0327 code which is the knock sensor low input. I took it in to a shop and they replaced the knock sensor. It was still showing the check engine light so they replaced it again. Still same issue so the third one I found the GM knock sensor part and they installed that one. They thought that maybe the issue was my car needing the GM sensor as I have had issues in the past with parts. Still having the issue. Where do we go from here? Where is the wire harness on this car and how do you get to it? The knock sensor just connects to the engine. Any help is appreciated. Thank you.
Racemysaturn4me is offline   Reply With Quote
SaturnFans.com Sponsored Links
Old 12-07-2021, 07:21 PM   #2
TomM96
Master Member
TomM96 has a spectacular aura aboutTomM96 has a spectacular aura about
 
Join Date: May 2004
Location: Long Island, NY
Posts: 2,104
Default Re: Knock Sensor Mystery

I dunno much about that sensor; I think NGK, Denso, and Standard
Motor Products are likely to be good quality (with OEM best).

FIF, Fdryer, or BillR are likely to be more informative.

Two things which Might be worth doing:
1. check/clean some harness grounds
2. disconnect battery (& maybe pull fuse for air bag); then
(taking care to avoid static discharge) Remove/Replace the
multipin connectors to the PCM.
TomM96 is offline   Reply With Quote
Old 12-09-2021, 12:29 AM   #3
cgg17
Advanced Member
cgg17 is just really nicecgg17 is just really nicecgg17 is just really nicecgg17 is just really nicecgg17 is just really nice
 
cgg17's Avatar
 
Join Date: Mar 2017
Location: Eastern Pennsylvania
Posts: 893

1995 SL2
1995 SW2
Default Re: Knock Sensor Mystery

I would advise checking the wiring harness for the knock sensor. I believe on 1997 models, the PCM is underneath the dashboard, which is easy to remove. Check for continuity between the knock sensor wire going into the PCM plug, and the knock sensor connector at the sensor itself.

I am not too sure of which wire/terminal number it is for the PCM side, you will have to locate a wiring diagram for the 1997 model year for that. I only have a set of 1995 manuals to reference from, and they use a different PCM.

Best of luck
...
1994 Sl2 5spd: First Car, Stock: 56,576 (Totaled 1/10/2018)
1994 Sl1 5spd: Inherited, Stock: 494,500
1995 Sl2 5spd: Retired Daily, Not Stock: 196,000
1995 SW2 4spd: Daily, Stock: 104,000
cgg17 is offline   Reply With Quote
Old 12-15-2021, 09:36 PM   #4
TomM96
Master Member
TomM96 has a spectacular aura aboutTomM96 has a spectacular aura about
 
Join Date: May 2004
Location: Long Island, NY
Posts: 2,104
Default Re: Knock Sensor Mystery

Soooo re-read a post mentioning issues with other sensors.

Maybe check&renew grounds in engine compartment; if they have
different resistances/(impedances) that might effect what levels the PCM can 'read'.
TomM96 is offline   Reply With Quote
Old 12-15-2021, 10:47 PM   #5
SRGW
Advanced Member
SRGW is a name known to allSRGW is a name known to allSRGW is a name known to allSRGW is a name known to allSRGW is a name known to allSRGW is a name known to all
 
SRGW's Avatar
 
Join Date: Nov 2005
Location: Northern New Jersey
Posts: 718

1997 SL1
Post Re: Knock Sensor Mystery

See attached knock sensor lower right bottom.

1995 SL1 236,300 2005>2018
1997 SL1 93,800 2014>????
CHECK YOUR OIL!!
Attached Images
File Type: jpg image (3).jpg (87.6 KB, 16 views)
SRGW is offline   Reply With Quote
Old 12-29-2021, 12:06 AM   #6
Racemysaturn4me
New Member
Racemysaturn4me is on a distinguished road
 
Join Date: Oct 2021
Location: Albuquerque NM
Posts: 6

1997 SC2
Default Re: Knock Sensor Mystery

The check engine light that is putting out this code P0327 is now intermittent. If the check engine light is on for a while and then off and then on again, could that be more likely a wiring issue?
Racemysaturn4me is offline   Reply With Quote
Old 12-29-2021, 08:00 PM   #7
TomM96
Master Member
TomM96 has a spectacular aura aboutTomM96 has a spectacular aura about
 
Join Date: May 2004
Location: Long Island, NY
Posts: 2,104
Default Re: Knock Sensor Mystery

> could that be more likely a wiring issue?

Sure ... on most days there is greater likelihood of variance in 20-year old wiring, than a recently-manufactured component.

The fact that you've replaced an indicated component a few times ... and
the issue has changed to 'intermittent' from 'constant' condition, is
probably a sign of progress.

Spraying electric contact cleaner onto the harness connector for the
knock sensor might be worthwhile (the re-connection process at that point
may have dislodged some OXIDATION of the metallic surface of the
connector, decreasing the loss at that position.

Metals tend to have low resistance when clean. When dirty, or covered
with oxidation, the resistance to electric flow is often Much higher.

There's a chance some antifreeze or salt spray got into the connector at one time. Even atmospheric contact can eventually tarnish contact surfaces;
at elevated temperatures, the Rate of oxidation is much higher than
at room temperature.
TomM96 is offline   Reply With Quote
Old 12-30-2021, 07:17 PM   #8
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 45,658
 

2003 L-Series 3.0L Sedan
Default Re: Knock Sensor Mystery

Racemysaturn4me, several past threads about knock sensor issues were traced back to an unusual issue - worn out belt tensioner hitting its own end stop. The mechanical rattling is heard by the knock sensor and triggers the error code. Examine the belt for looseness as it should be tight with very little deflection when pressing on it with fingers.
fdryer is offline   Reply With Quote
Old 01-01-2022, 07:10 PM   #9
Racemysaturn4me
New Member
Racemysaturn4me is on a distinguished road
 
Join Date: Oct 2021
Location: Albuquerque NM
Posts: 6

1997 SC2
Default Re: Knock Sensor Mystery

"Spraying electric contact cleaner onto the harness connector for the
knock sensor might be worthwhile (the re-connection process at that point
may have dislodged some OXIDATION of the metallic surface of the
connector, decreasing the loss at that position."

I think it's very likely you are right on with this one. I did have an issue with a major antifreeze leak so it probably leaked onto there. As I recall it probably was around that time that I started having codes for the knock sensor popping up. Thank for the advice! I will try cleaning that connector.
Racemysaturn4me is offline   Reply With Quote
Old 01-02-2022, 01:52 AM   #10
TomM96
Master Member
TomM96 has a spectacular aura aboutTomM96 has a spectacular aura about
 
Join Date: May 2004
Location: Long Island, NY
Posts: 2,104
Default Re: Knock Sensor Mystery

One day under my '97DOHC, i noticed that the corner/edge of the
block above the starter motor flange was coated with some sort of
corrosion (which i guessed may have been a coolant leak). It was of
interest because the starter(s) on that car Never got quite enough
power to crank properly {later guessed excess loss in the transmission
PRNDL/neutral-safety switch}....
TomM96 is offline   Reply With Quote
Reply

Bookmarks

Tags
knock sensor, knock sensor harness


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
mystery sensor tink65 S-Series Tech 10 04-13-2015 11:55 PM
Mystery Sensor Bobber S-Series Tech 1 03-14-2009 05:45 PM
Mystery sensor... triple_el S-Series Tech 4 08-22-2008 10:33 AM
Knock Sensor maliblu S-Series Tech 3 10-24-2006 08:04 AM
what solves excessive spark knock (besides knock sensor) geartooth94 Miscellaneous Tech 15 09-26-2004 09:36 PM


All times are GMT -4. The time now is 07:06 PM.

Advanced Forum Search | Advanced Photo Search


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
SaturnFans.com. The Saturn Enthusiasts Site.