Trouble Codes

For discussion and distribution of custom code and hacks
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Joined: Sun Jan 25, 2015 4:21 pm
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Re: Trouble Codes

Postby j_ds_au » Tue Dec 29, 2020 2:27 am

POZE wrote:Looks like the ALDL is different on the US cars. We grounded the diagnostic terminal and counted flashes for years until scan tools were available. If needed we could change the diagnostic connector or make jumpers and use a scan tool for a VR. Thanks for the info!

Although you could be right, I'm not sure there's a US/AU difference with ALDL, rather two distinct versions :
- An old uni-directional 160 baud version that output a 12V data stream via the Check Engine light (unless in the US this protocol was output instead via an ALDL transceiver, with 5V signalling). Eg. our factory '808 ECM.
- A newer bi-directional 8192 baud version with a command-response protocol, via an ALDL transceiver (5V signalling). Eg. our '424 ECM.

Joe.

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