Dedicated Baro sensor for '808

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Re: Dedicated Baro sensor for '808

Postby vlad01 » Sat Jan 02, 2021 1:42 pm

"55. ECU A to D error. Check ECU grounds, or excessive input voltage."

That could be the source of the baro taking a dive. Check the battery voltage while you are at it, alternator reg might be bad and over volting the system.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Dedicated Baro sensor for '808

Postby vlad01 » Sat Jan 02, 2021 1:58 pm

looked at the log, there are a number of baro drop outs and few map ones too. I spotted a spark advance drop out as well, the battery voltage seems unstable and low as well, bouncing around 12.8 to 13.2 mostly.

I would check the ground connections on the front of the block as well as the main ground from the engine mount to the body and battery. Double check the alternator is working, it should be 13.8 to about 14.2v
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Dedicated Baro sensor for '808

Postby Steve M » Mon Jan 04, 2021 3:50 pm

Voltage across battery terminals is 13.8-13.9V at idle and when engine revs are increased.
Logged Battery voltage is 12.8-13.2V

Engine earths checked:
Head - ECU Earth passenger side
Head - ECU Earth driver's side
Head - firewall engine rear
Engine mount - chassis driver's side
Engine mount - chassis to battery passenger side
Battery - head passenger side

None are loose.

The BARO spike still occurs when 2nd MAP is plugged in and when it is unplugged.

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Re: Dedicated Baro sensor for '808

Postby vlad01 » Mon Jan 04, 2021 4:18 pm

Check the connectors at the ECU, if not try a different ECU and see.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Dedicated Baro sensor for '808

Postby Charlescrown » Mon Jan 04, 2021 4:39 pm

First thing I would do is a voltage drop from the battery negative post and the alternator outer casing with the engine running and lights on. No more than 0.2 volts. After that it's measuring voltage drops between the battery positive and ECU positives (no more than 0.5 volts) and ECU negatives and battery negative posts.

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