PCM issues
#46
Rennlist Member
Join Date: Feb 2009
Location: Newport Beach, CA and Melbourne, Australia
Posts: 4,282
Received 2,839 Likes
on
1,493 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The arrow etc. will show up in center display under tach when you have entered a destination for Navigation, and then tap your lower left computer stock to scroll through displays until the arrow shows up there. If there is no "active" destination in the Nav, the center (centre) display will say "Route guidance not active". Then you tap your computer stock to bring up something useful like TPMS or audio info.
When you get close to a turn there is a small vertical bar that appears next to the arrow that starts out as an outline and as you get closer to the turn progressively fills in, bottom to top. I find that useful as it also shows you any side roads between where you currently are and the turn.
So if, for example, you're a couple of hundred metres (sorry, yards) from the turn and there are 2 small side roads they will show as small lines off to the side. As you pass each of those side roads they dissappear of the screen.
There must be some room buried down in a building somewhere full of dudes thinking through all these use cases!
#47
Racer
Join Date: Nov 2009
Location: Seal Beach, SOUTHERN california
Posts: 335
Likes: 0
Received 6 Likes
on
4 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The TPMS on my Targa consistently displayed pressures that were about 3 psi lower than what I measured with my digital tire gauge. So I only had to drop 1 psi to trip a warning from the system, since it thought I was now 4 psi below recommended pressure. It was only useful to me as a relative indicator of pressure changes rather than absolute pressures. I'm almost glad my latest car doesn't have it so I don't have to look at false warnings on the cluster.
thanks much for your response Ken
I asked the dealer what I should do about tire pressures, because my digital gauge reads different from the dash display in my 997. The service manager told me that the dash display is 100% accurate, and my digital display must be out of calibration. He said that I should go by the numbers on the dash display. I now see that the opposite is true, which is what I suspected all along. I think I will try a few different digitals, and see if I can get any of them to agree. that should be the most precise readily available solution.
#48
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
thanks much for your response Ken
I asked the dealer what I should do about tire pressures, because my digital gauge reads different from the dash display in my 997. The service manager told me that the dash display is 100% accurate, and my digital display must be out of calibration. He said that I should go by the numbers on the dash display. I now see that the opposite is true, which is what I suspected all along. I think I will try a few different digitals, and see if I can get any of them to agree. that should be the most precise readily available solution.
I asked the dealer what I should do about tire pressures, because my digital gauge reads different from the dash display in my 997. The service manager told me that the dash display is 100% accurate, and my digital display must be out of calibration. He said that I should go by the numbers on the dash display. I now see that the opposite is true, which is what I suspected all along. I think I will try a few different digitals, and see if I can get any of them to agree. that should be the most precise readily available solution.
I bought a reasonably priced, nearly unbreakable "Intercomp" tire pressure gauge from Pegasus racing a long time ago and would recommend them all day long to anyone interested in a good, reasonably priced, but high quality gauge.
#49
Rennlist Member
Join Date: Jun 2004
Location: Sydney Australia
Posts: 620
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Could not find the specs on the Beru but the Hella TUV tests are available:
http://www.hella.com/hella-com-en/as...eetTPMS_en.pdf
At 2.5 bar (250 kpa or 36 psi) the accuracy is almost minus 3 % or around 1 psi
A good dial type 60 psi gauge has an accuracy of +/- 1.2 psi
Here is an example:
http://www.getagauge.com/faq.cfm
So a discrepency of up to 3 psi is possible even with a good tire gauge
http://www.hella.com/hella-com-en/as...eetTPMS_en.pdf
At 2.5 bar (250 kpa or 36 psi) the accuracy is almost minus 3 % or around 1 psi
A good dial type 60 psi gauge has an accuracy of +/- 1.2 psi
Here is an example:
http://www.getagauge.com/faq.cfm
So a discrepency of up to 3 psi is possible even with a good tire gauge
#50
Drifting
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Update to my PCM issues. I took my car into the dealer today. My service rep had (surprisingly) abided by my request to obtain the enabling codes from PCNA yesterday. However, it turns out not to be an enabling code issue, but a faulty PCM unit. The Service Rep needs to obtain the Service Manager's approval before replacing it due to it being a $2400 item. So I'll need to go back on a week day so he can sign off on the replacement. My car has 1 month to go on the factory warranty, and despite being recently CPO'd, I didn't want to take any chances.
I solved my courtesy light issue. It turns out I had set the rocker switches to center position for the left and right overhead courtesy lights, but had overlooked the rocker for the center light. Once set to center position, on came the footwell lights. So it turns out you can't have footwell lights on without the center overhead light. I'm sure the designer had some logical reason for that!
Thanks again for all the suggestions.
I solved my courtesy light issue. It turns out I had set the rocker switches to center position for the left and right overhead courtesy lights, but had overlooked the rocker for the center light. Once set to center position, on came the footwell lights. So it turns out you can't have footwell lights on without the center overhead light. I'm sure the designer had some logical reason for that!
Thanks again for all the suggestions.
#51
Drifting
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
OK, another update. I'm only continuing this post to make everyone aware of the complexity of the electronics on these cars.
I took my car into the Dealer today to have the PCM replaced, based on their assessment on Feb 6. Well, it turned out that the PCM wasn't defective after all. However, apparently the instrument cluster had been replaced in May 2009, and settings/codes hadn't been properly uploaded. So it is apparent that electronics in the instrument cluster can impact the PCM.
So I picked up my car a while ago. I now have individual settings that were previously missing, but the "daytime running lights" is dark, not active. WTF?? I thought, oh well, I'll deal with it later.
Then on the way home, I thought the car was riding quite rough, so checked to make sure the sport setting hadn't been activated. It wasn't lit up, but when I hit the button, it didn't light up either! Same result for the shock setting button. Neither would light up, but it felt like I was in the firm setting. I just went and started the car in the garage, and now the shock button lights up when activated, but the sport button won't turn on. Anyone ever experience this phenomenon?
So it looks like another trip to the Dealer is required. Will it ever end?
I took my car into the Dealer today to have the PCM replaced, based on their assessment on Feb 6. Well, it turned out that the PCM wasn't defective after all. However, apparently the instrument cluster had been replaced in May 2009, and settings/codes hadn't been properly uploaded. So it is apparent that electronics in the instrument cluster can impact the PCM.
So I picked up my car a while ago. I now have individual settings that were previously missing, but the "daytime running lights" is dark, not active. WTF?? I thought, oh well, I'll deal with it later.
Then on the way home, I thought the car was riding quite rough, so checked to make sure the sport setting hadn't been activated. It wasn't lit up, but when I hit the button, it didn't light up either! Same result for the shock setting button. Neither would light up, but it felt like I was in the firm setting. I just went and started the car in the garage, and now the shock button lights up when activated, but the sport button won't turn on. Anyone ever experience this phenomenon?
So it looks like another trip to the Dealer is required. Will it ever end?
#53
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I took my car into the Dealer today to have the PCM replaced, based on their assessment on Feb 6. Well, it turned out that the PCM wasn't defective after all. However, apparently the instrument cluster had been replaced in May 2009, and settings/codes hadn't been properly uploaded. So it is apparent that electronics in the instrument cluster can impact the PCM.
So I picked up my car a while ago. I now have individual settings that were previously missing, but the "daytime running lights" is dark, not active. WTF?? I thought, oh well, I'll deal with it later.
Then on the way home, I thought the car was riding quite rough, so checked to make sure the sport setting hadn't been activated. It wasn't lit up, but when I hit the button, it didn't light up either! Same result for the shock setting button. Neither would light up, but it felt like I was in the firm setting. I just went and started the car in the garage, and now the shock button lights up when activated, but the sport button won't turn on. Anyone ever experience this phenomenon?
Then on the way home, I thought the car was riding quite rough, so checked to make sure the sport setting hadn't been activated. It wasn't lit up, but when I hit the button, it didn't light up either! Same result for the shock setting button. Neither would light up, but it felt like I was in the firm setting. I just went and started the car in the garage, and now the shock button lights up when activated, but the sport button won't turn on. Anyone ever experience this phenomenon?
Sorry to hear you're having all of these issues.
What dealer are you working with? I hope they're at least being accomodating with a loaner, etc. given all this craziness.
#54
Drifting
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Ken - this was what I suspected. Your symptoms mirror what I experienced when my cluster was replaced... see posts above.
That's just nonsense. You'd think the dealer would do some sort of QC to makes sure things were back in order.
Sorry to hear you're having all of these issues.
What dealer are you working with? I hope they're at least being accomodating with a loaner, etc. given all this craziness.
That's just nonsense. You'd think the dealer would do some sort of QC to makes sure things were back in order.
Sorry to hear you're having all of these issues.
What dealer are you working with? I hope they're at least being accomodating with a loaner, etc. given all this craziness.
#55
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Hopefully Newport takes care of you.
#57
Drifting
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
In the middle of all this, I discovered my Sport button wasn't working. Today they determined that it is faulty and have to order one in. So I get to make another trip on Saturday morning. Luckily they can replace it while I wait.
All this reinforces why warranties are important. In my experience lately, it is the electronics that are more troublesome than mechanicals.
Good luck with your cluster replacement.
Ken