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P0320 P1684 codes

 
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  • 1 Post By ptcruisersteve
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  #1 (permalink)  
Old 20 Sep 2016, 11:14 am
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Default P0320 P1684 codes

2002 base model 5-speed non turbo 118000 miles.

Car hesitated briefly one day then shut off while driving about 45 mph in 5th gear.

Pulled over, tried to start it twice but it wouldn't fire up.

Checked timing belt - not broken.

tried to start again - started right up and drove home.

Threw codes P0320 (Crank sensor) and P1684 (battery disconnected recently)

Weird. Why did it start up on the third attempt?

Maybe limp mode? No check engine light though.

Disconnect crank sensor connector. Would not start.

Reconnect crank sensor. Starts right up.

Notice wiring by camshaft sensor is very damaged by oil leak and bare copper is showing. Tape it up with electrical tape and clean oil from area.

Clear codes by disconnecting battery. P0320 is gone. P1684 still there (at least P1684 makes sense this time).

Car drives fine around neighborhood.


Any ideas?
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Old 20 Sep 2016, 11:21 am
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Default Re: P0320 P1684 codes

Welcome to the forum.

You might want to introduce your self and post some pictures of your PT Cruiser.

I would suggest that the wiring going to the crankshaft sensor might be bad internally causing intermittent ignition timing failure.
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Old 20 Sep 2016, 11:42 am
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Default Re: P0320 P1684 codes

Quote:
Originally Posted by ptcruisersteve View Post
Welcome to the forum.

You might want to introduce your self and post some pictures of your PT Cruiser.

I would suggest that the wiring going to the crankshaft sensor might be bad internally causing intermittent ignition timing failure.
Also on these models the wiring can get damaged because it's near the axle shaft. The sensor could be good. Given you have these two codes together. That is going to be your problem. Happened to many such as the moderator CREWZEN. If it hanging lose I would inspec it carefully.
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Old 22 Sep 2016, 05:32 pm
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Default Re: P0320 P1684 codes

Upon visual inspection the wiring appears to be well away from the axle and no signs of rubbing are apparent.

The Crank and Cam sensors were replaced with Non-Mopar parts from PepBoys about 5 years ago. Has anyone experienced intermittent trouble before a sensor finally dies?

I'm thinking of just replacing the car. My K frame is in very bad shape due to Upstate NY road salt just savagely destroying everything it touches.
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Old 22 Sep 2016, 06:12 pm
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Default Re: P0320 P1684 codes

Quote:
Originally Posted by WingMD View Post
Notice wiring by camshaft sensor is very damaged by oil leak and bare copper is showing. Tape it up with electrical tape and clean oil from area.
Quote:
Originally Posted by WingMD View Post
Upon visual inspection the wiring appears to be well away from the axle and no signs of rubbing are apparent.

The Crank and Cam sensors were replaced with Non-Mopar parts from PepBoys about 5 years ago. Has anyone experienced intermittent trouble before a sensor finally dies?

I'm thinking of just replacing the car. My K frame is in very bad shape due to Upstate NY road salt just savagely destroying everything it touches.
Considering you found the wiring damaged going to the crankshaft sensor I would unplug the wire connectors at both ends of the crankshaft sensor wire and check it with an ohm meter. Wriggle it while looking at the ohm meter and see if there is a change in resistance.
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Old 04 Oct 2016, 07:04 pm
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Default Re: P0320 P1684 codes

I ended up installing a new crankshaft sensor and everything seems okay so far!
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Old 04 Oct 2016, 07:23 pm
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Default Re: P0320 P1684 codes

Glad it seems fixed. I think the cam and crank sensors are basically Hall effect sensors. I have had plenty of experience with intermittent problems with them as distributor triggers in older mopars. They often would start working again when they cooled.
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Old 05 Oct 2016, 07:26 am
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Default Re: P0320 P1684 codes

I am just wondering out loud here. Is there any such thing as "limp mode" in a five speed PT? I thought that just applied to the automatics.
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Old 05 Oct 2016, 09:11 am
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Default Re: P0320 P1684 codes

Quote:
Originally Posted by chuzz View Post
I am just wondering out loud here. Is there any such thing as "limp mode" in a five speed PT? I thought that just applied to the automatics.
Chuzz, it was posted "maybe limp mode?" so the member WindMD was only guessing at that time what might be happening to the PT Cruiser.
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Last edited by ptcruisersteve; 05 Oct 2016 at 09:15 am.
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Old 05 Oct 2016, 04:55 pm
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Default Re: P0320 P1684 codes

I realize that, Steve. I'm just wondering if a manual can actually become stuck in 2nd gear if something goes wrong with the PCM or TIPM. Do you know if that's possible with a manual shift? I wouldn't think so, but with computers controlling so much nowadays, who can say, right?
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