Re: Trouble Codes
Posted: Tue Dec 29, 2020 2:27 am
Although you could be right, I'm not sure there's a US/AU difference with ALDL, rather two distinct versions :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!
- 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.