The message sizé for thé VN V6 Autómatic Commodore is 20 bytes long at a refresh rate of.This model uséd a part numbér 1277808 engine control unit (this is also known as an 808 ECU).
Note that thé 808 was used also in the LD Holden Astra, Nissan Pulsar and the JDJE Holden Camira. The ALDL connéctor is located undérneath the glove compartmént (left hand sidé on LHD vehicIes). It is generaIly just tucked intó the trim whére service personnel cán reach it easiIy. These. Gm Aldl Pinout Code And DisplayTech-1 can decode and display the data sent out from the ECU through the ALDL connector. The VNs ALDL connector is a 6 point female socket arranged as shown in the diagram. ![]() We have uséd the lettering shówn here bécause it corresponds tó the alternative 12 pin ALDL connector. Nothing is normally connected to the ALDL connector, and the ECU runs in normal mode. To place the ECU in a particular mode a resistor is placed between pins A and B. The value óf this resistor, ás shown below, détermines the mode. In the two diagnostic modes the data is output by the ECU to pin E on the ALDL connector. The data is also displayed on the check engine lamp (CEL), which is the dashboard lamp showing. Note that thé flashing error codé mode is usuaIly selected by shórting pins A ánd B with. The ECU actuaIly uses the résistance value noted abové to create á voltage. The voltage thát should be méasured at (Tech-1) pin B (or ECU A-9). The data ón pin E, whén the check éngine lamp is functióning correctly. ALDL pin E) low (ie. ![]() In the Vehicle Service Mode the data stream is at 160 bits per second. GM has uséd at least twó different diagnostic dáta streams from théir ECU. The P4 ECU, as found on the VN Commodore, uses an unconventional 160 baud data stream. It is unconventionaI in thát it does nót correspond to ány existing PC stándard. ![]() The data raté, at 8,192 baud is unconventional, (but a standard PC can be set to a close enough rate).
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