Clueless! Left Turn Signal = Downshifting?

jsgolfer · 09-30-2009, 08:18 PM

I am at my wits end here folks. For about a month now when i put on my left turn signal, my car seems to downshift violently. the whole car shakes like i went from drive to first (Automatic) if im idling and i put on my left signal the car lurches forward. no check engine light. the signal works fine on the outside of the car. any ideas? thanks!

**SeR_Cyclops** · 09-30-2009, 08:28 PM

is the car a rebuilt?

justanothermp5 · 09-30-2009, 08:53 PM

yea maybe u have some wires crossing or something

i12drivemyMP5 · 10-01-2009, 07:41 AM

Sounds like voodoo........

**SeR_Cyclops** · 10-01-2009, 09:16 AM

I would think that a short could cause that. or maybe even like too much voltage on a wire and its causing the tranny to act crazy.

ucMP3 · 10-01-2009, 09:30 AM

Trace back your wires from the turn signal. Single out the ones for the left turn signal and keep going until you find something that is not normal, i.e. crossed wires, bare wires, etc...

Good luck m8! Wiring issues are a PITA! I have had several with my protege, although none nearly as bad as this. I still have a short somewhere in the wiring for my horn. Haven't felt like dealing with it. Only reason I really need it is to have a functioning alarm. Blinking lights only does so much, lol.

P-Funk! · 10-01-2009, 01:53 PM

Check the ground for the turn signal (front and rear).

Remove the bulbs (front and back) and then see if it jumps. Measure the amperage.

I really suspect a floating ground issue or a maybe a bad ECU (since that is one of the few places where those two systems kinda' interface...

slavrenz · 10-01-2009, 02:01 PM

Quote:

Originally Posted by ucMP3

Trace back your wires from the turn signal. Single out the one for the left turn signal and keep going until you find something that is not normal, i.e. crossed wires, bare wires, etc...

Good luck m8! Wiring issues are a PITA! I have had several with my protege, although none nearly as bad as this. I still have a short somewhere in the wiring for my horn. Haven't felt like dealing with it. Only reason I really need it is to have a functioning alarm. Blinking lights only does so much, lol.

You better hope they've got some severe epilepsy in order to incapacitate them

drgnzadiel101 · 10-01-2009, 05:20 PM

Quote:

Originally Posted by i12drivemyMP5

Sounds like voodoo........

some say that some machines in the world are just cursed. maybe its one of them

pasadena_commut · 10-01-2009, 06:05 PM

Quote:

Originally Posted by jsgolfer

I am at my wits end here folks. For about a month now when i put on my left turn signal, my car seems to downshift violently. the whole car shakes like i went from drive to first (Automatic) if im idling and i put on my left signal the car lurches forward. no check engine light. the signal works fine on the outside of the car. any ideas? thanks!

If it is in manual mode when you do this does the dashboard display show it changing to a lower gear?

By idling, do you mean it was in Neutral? Or were you sitting in gear with your foot on the brake? Either way, if your left turn signal causes the car to lurch forward that is one dangerous car.

If you pull the turn signal fuse (not sure which one it is, but there must be one) does the problem go away? If so, great. Now that your car is slightly less lethal drive directly to a mechanic you trust and let them work on it.

ucMP3 · 10-02-2009, 06:54 AM

Quote:

Originally Posted by slavrenz

You better hope they've got some severe epilepsy in order to incapacitate them

Ya, my alarm is a new breed. Doesn't make noise to attract attention and deter thieves. It gives them seizures to incapacitate them.

09-30-2009, 08:18 PM	#1
jsgolfer West Staines Massive! 2002 Protege 5 Join Date: Jan 2002 Location: Woodstock, GA Posts: 939	Clueless! Left Turn Signal = Downshifting? I am at my wits end here folks. For about a month now when i put on my left turn signal, my car seems to downshift violently. the whole car shakes like i went from drive to first (Automatic) if im idling and i put on my left signal the car lurches forward. no check engine light. the signal works fine on the outside of the car. any ideas? thanks! __________________ Intake/Exhaust:Mazda Racing Header, Injen CAI (Black), Magnaflow High-Flow Cat Suspension/Brakes:Eibach Pro-Kit, Tokico Illumina Shocks/Struts, Cadium Plated Cross Drilled Brembo Rotors, Goodridge SS Brakelines Appearence:JDM Tail Light Conversion, JDM Famillia Badge, Mazdaspeed Engine Cover, Grill and Eyelids, PIAA Ion Crystal H3 Bulbs Misc:Sun Auto Hyper Ground System, Rear Step Guard, Sirius Satelite Radio, Tons of Door Dings and Scratches

09-30-2009, 08:28 PM	#2
SeR_Cyclops MSP# 518 Kentucky, MSP & FS Moderator Mazdaspeed Protege Join Date: Sep 2006 Location: Somerset KY Posts: 4,558	is the car a rebuilt? __________________

09-30-2009, 08:53 PM	#3
justanothermp5 Built and Boosted Rust Bucket Join Date: Oct 2007 Location: Linden/Charlotte NC Posts: 6,309	yea maybe u have some wires crossing or something __________________ 2002 Mazda Protege 5-T For Sale5Zigen ProRacer GN+ 17x7.5 http://www.mazdas247.com/forum/showt...hp?t=123781244

10-01-2009, 09:16 AM	#5
SeR_Cyclops MSP# 518 Kentucky, MSP & FS Moderator Mazdaspeed Protege Join Date: Sep 2006 Location: Somerset KY Posts: 4,558	I would think that a short could cause that. or maybe even like too much voltage on a wire and its causing the tranny to act crazy. __________________ Sigs are visible only in your first post on a page. To change your thread display preferences, click here and enable 'Always Show Signature'.

10-01-2009, 09:30 AM	#6
ucMP3 Doin It & Doin It Well Mazda Protege MP3 Join Date: May 2007 Location: Cincinnati, Ohio Posts: 7,000	Trace back your wires from the turn signal. Single out the ones for the left turn signal and keep going until you find something that is not normal, i.e. crossed wires, bare wires, etc... Good luck m8! Wiring issues are a PITA! I have had several with my protege, although none nearly as bad as this. I still have a short somewhere in the wiring for my horn. Haven't felt like dealing with it. Only reason I really need it is to have a functioning alarm. Blinking lights only does so much, lol. __________________ Protege F/S Thread Universal F/S Thread MP3 Mod List Last edited by ucMP3; 10-02-2009 at 06:51 AM.

10-01-2009, 07:41 AM	#4
i12drivemyMP5 0110101110001101100001110 Donated: $5 2003 P5 Join Date: Apr 2005 Location: LAT 29 76 63.01 N LON 95 36 45.10 W-HouTX for the GPS challenged Posts: 5,048	Sounds like voodoo........

10-01-2009, 01:53 PM	#7
P-Funk! I <3 This Car! 02.5 Black Mica P5 Join Date: Jul 2002 Location: Chesapeake Beach, MD Posts: 2,767	Check the ground for the turn signal (front and rear). Remove the bulbs (front and back) and then see if it jumps. Measure the amperage. I really suspect a floating ground issue or a maybe a bad ECU (since that is one of the few places where those two systems kinda' interface... __________________ Black Mica Protege5 Mods: MP3 ECU Hawk Pads OBX Header AWR Mounts Tokico Blues Eibach Pro Kit Underdrive Pulley Kartboy Bushings ThermoBlok Spacers Kumho ECSTA AST tires Fabricated Ground Wire Kit VTCS-Less Intake (Ported) Fabricated SRI w/ K&N Filter Fog lights on with parking lights Audio: Kenwood Head Unit Kenwood Mono Amp Custom 10" Enclosures Boston Accoustic 1" Tweets Rockford/Fosgate Punch 50

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