Tire Pressure Monitor

[treacherous]

I got a low tire pressure light on drive home from work today. I got out and looked at tires and they looked fine so I drove home. When I checked pressure after they had warmed up they were about 32psi. I wonder if the cooler temperatures we are now receiving where I live may have caused this. I filled all tires up a few pounds and then checked for a code. I got a Code 15 which was a low pressure reading on front left tire. I went out for short drive and light went out. For those looking for wire to ground for codes here are some pics. It is actually taped to the OBD II connector.

[treacherous]

Here are the codes.

[treacherous]

I rotated my tires front to rear about 2 weeks back. I wonder if the code follows the wheel? Could my Code 15 actually be the left rear instead of the front rear? I need to look into this. I'm sure this has been covered.

[fabailey]

Tires are different size from front to back, how did you rotate them?

[CrazyRuskie]

They are the same size on the G35X

[terrycs]

This is really interesting ... by having error codes for EACH tire, the system appears to have the capability to read EACH tire pressure. The problem is we only have one dummy light if any of the tires are low.

Also interesting ... error codes 45-48 show low TPMS battery. I didn't know those transmitters had a battery!

Please let us know what you discover. I'm curious because mine got all mixed up when I had my new wheels put on.

Originally Posted by treacherous

I rotated my tires front to rear about 2 weeks back. I wonder if the code follows the wheel? Could my Code 15 actually be the left rear instead of the front rear? I need to look into this. I'm sure this has been covered.

[csdstudio]

My wifes TL has a screen that shows the exact pressure in each tire. (Listen up Infiniti, we even have two LCD screens with too many useless duplicate timers/meters and maintaince reminders, lol).

Sorry for the rant.

[treacherous]

Originally Posted by fabailey

Tires are different size from front to back, how did you rotate them?

Side to side.

[csdstudio]

Originally Posted by treacherous

Side to side.

Can't even do that, the stock sport tires are asymmetrical, they have 'inside' and 'outside' stamped right on the tire.

[treacherous]

Front to rear...rear to front... non sport here.

Page 8-36 in owners manual.

I just meant on the same side of car.

[Tiger]

Originally Posted by csdstudio

Can't even do that, the stock sport tires are asymmetrical, they have 'inside' and 'outside' stamped right on the tire.

We'll give you a minute to think about what you just typed before we begin to blast you...

[max2k1]

Originally Posted by treacherous

I got a low tire pressure light on drive home from work today. I got out and looked at tires and they looked fine so I drove home. When I checked pressure after they had warmed up they were about 32psi. I wonder if the cooler temperatures we are now receiving where I live may have caused this. I filled all tires up a few pounds and then checked for a code. I got a Code 15 which was a low pressure reading on front left tire. I went out for short drive and light went out. For those looking for wire to ground for codes here are some pics. It is actually taped to the OBD II connector.

@treacherous:

Tried to follow your "reading the code" piece - but got lost !
How did you pull the code ? Is it via an OBDII reader like the emissions codes ? (think not)
Or via some other mechanism ? (the grounding wire makes me think its something other than a ODB reader)

[csdstudio]

Originally Posted by Tiger

We'll give you a minute to think about what you just typed before we begin to blast you...

Why? They aren't directional, but only asymmetrical? I thought I saw a rotation arrow on the tire as well as 'outside'...but I'm probably wrong because an asymmetrical directional tire would be the worst idea ever.

[treacherous]

Take a piece of insulated wire and connect one end to the pictured white connector and then the other to a metal piece on the firewall. I used one of the bolts that holds the foot activated emergency brake pedal to the firewall.

I grounded mine after ignition was turned on and it went into diagnostic mode IIRC.

Attached is graphic from SM that shows how light blinking pattern will be displayed


On white connector make sure you plug into side with metal connector. One side is not used. OBD II reader is not used.

Hope this helps.

Originally Posted by max2k1

@treacherous:

Tried to follow your "reading the code" piece - but got lost !
How did you pull the code ? Is it via an OBDII reader like the emissions codes ? (think not)
Or via some other mechanism ? (the grounding wire makes me think its something other than a ODB reader)

[max2k1]

Originally Posted by treacherous

Take a piece of insulated wire and connect one end to the pictured white connector and then the other to a metal piece on the firewall. I used one of the bolts that holds the foot activated emergency brake pedal to the firewall.

I grounded mine after ignition was turned on and it went into diagnostic mode IIRC.

Attached is graphic from SM that shows how light blinking pattern will be displayed


On white connector make sure you plug into side with metal connector. One side is not used. OBD II reader is not used.

Hope this helps.

Great - thanks for the clarification - that helps a lot