Boost pressure showing 0.0 bar
#1
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The boost pressure on the OBC display of my 1994 Turbo 3.6 is showing 0.0 bar in all driving conditions. The turbo itself is generating boost no problem and the car pulls hard when the boost builds. So far, I've swapped out the boost pressure sending unit along with the overboost sensor (both mounted to the intercooler). Any ideas what might be causing the OBC to show no boost? The OBC itself is working fine and other items (e.g. speed) seem to display just fine.
#2
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The boost pressure on the OBC display of my 1994 Turbo 3.6 is showing 0.0 bar in all driving conditions. The turbo itself is generating boost no problem and the car pulls hard when the boost builds. So far, I've swapped out the boost pressure sending unit along with the overboost sensor (both mounted to the intercooler). Any ideas what might be causing the OBC to show no boost? The OBC itself is working fine and other items (e.g. speed) seem to display just fine.
The connector on my overboost switch did this, resulting in a no-start after I reassembled my car after restoring the a/c system. After seeing that the fuel pumps weren't being enabled, I went back to the connector and squeezed it shut. Cured!
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#8
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The factory display will only read to .7 bar. I've ignored it for the entire course of my ownership.
There used to be a guy who modded the display to show all kinds of parameters, including actual boost, but he's been out of business for some time now. Cobalt has such a display;maybe he'll chime in.
I had to install a mechanical gauge to really know what boost I was running.
Last year I installed a Innovate PBR-1 gauge to take the place of the Innovate LM-1 handheld unit that rode shotgun in the passenger seat for 5 years. It displays afr and boost or peak boost (which is where I'm set now). I can plug a laptop into it and record afr, boost and rpm in graphic form.
There used to be a guy who modded the display to show all kinds of parameters, including actual boost, but he's been out of business for some time now. Cobalt has such a display;maybe he'll chime in.
I had to install a mechanical gauge to really know what boost I was running.
Last year I installed a Innovate PBR-1 gauge to take the place of the Innovate LM-1 handheld unit that rode shotgun in the passenger seat for 5 years. It displays afr and boost or peak boost (which is where I'm set now). I can plug a laptop into it and record afr, boost and rpm in graphic form.
#11
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I doubt that. the turbo schaltgerät (965.618.130.01, under the drivers seat) supplies voltage to the ignition unit, fuel pumps and lambda control module. if it had died the engine simply would not run.
Actually there is no electrical connection between the boost pressure sensor and the turbo schaltgerät. See wiring diagram instruments.
Fritz
Actually there is no electrical connection between the boost pressure sensor and the turbo schaltgerät. See wiring diagram instruments.
Fritz
#12
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I doubt that. the turbo schaltgerät (965.618.130.01, under the drivers seat) supplies voltage to the ignition unit, fuel pumps and lambda control module. if it had “died“ the engine simply would not run.
Actually there is no electrical connection between the boost pressure sensor and the turbo schaltgerät. See wiring diagram “instruments“.
Actually there is no electrical connection between the boost pressure sensor and the turbo schaltgerät. See wiring diagram “instruments“.
If replacing the boost sensor hasn't resolved the issue then the line has to be rung out.
Last edited by Metal Guru; 09-10-2021 at 08:29 PM.
#13
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There's also a blue relay behind the fuel gauge that controls the OBC. I might be wrong. but worth looking into.
Good luck bud
Good luck bud