4/21/2021 0 Comments Gm Aldl Connector Pinout Diagram
This model used a part number 1277808 engine control unit (this is also known as an 808 ECU).The ALDL connector is located underneath the glove compartment (left hand side on LHD vehicles).
![]() It is generally just tucked into the trim where service personnel can reach it easily. These. Gm Aldl Connector Pinout Diagram 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. The GM Tech-1 mating connector is part number TA02329A (the Tech-1 is a diagnostic device used by GM technicians). We have used the lettering shown here because it corresponds to 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 of this resistor, as shown below, determines 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 the flashing error code mode is usually selected by shorting pins A and B with. The ECU actually uses the resistance value noted above to create a voltage. The voltage that should be measured at (Tech-1) pin B (or ECU A-9). The data on pin E, when the check engine lamp is functioning correctly. ALDL pin E) low (ie. Volts) to turn the Check Engine Lamp on. In the Vehicle Service Mode the data stream is at 160 bits per second. GM has used at least two different diagnostic data streams from their ECU. The P4 ECU, as found on the VN Commodore, uses an unconventional 160 baud data stream. It is unconventional in that it does not correspond to any existing PC standard. The GM P4 ECUs with the SXR UART driver chip, uses a conventional data. The data rate, at 8,192 baud is unconventional, (but a standard PC can be set to a close enough rate).
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