Aldl Commodore Software
About: This information will be updated from time to time and serves as a basic introduction to GM ALDL, specifically aimed at GM Holden Commodores. What It is and What Can It Do: ALDL stands for Assembly Line Diagnostic Link. It is used for a variety of things from, as the name suggests, initial system testing when the vehicle is manufactured to vehicle module communications to diagnostics at the dealer/home to real-time tuning. There are a few different implementations of ALDL VN/VP – This was the first implementation, was also the most basic and is the only implementation that uses ALDL for purely diagnostic purposes. It operates at 160 baud and is a uni-directional (read only) data link. The ECM uses a ‘bit-banging’ technique on the CEL (Check Engine Light) wire to flash data out bit by bit.
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Bit banging is a method to transmit serial data using only software rather than a hardware UART. It is ok for slow data speeds but puts too much load on the microprocessor for high baud rates. The 160 baud rate is due to the ECM operating with 6.25ms minor loop interrupts. On every interrupt a bit is applied to the CEL wire, 6.25ms = 160Hz or 160baud. When ALDL is enabled the CEL will flash with the data. VR/VS – The second and probably the most widely used type is 8192 baud, this is also used in many GM built US vehicles from the mid/late 80s to the late 90s and often referred to as OBD-I.
It is a bi-directional half-duplex data link using a hardware UART in the processor and a Delco/Delphi transceiver IC. The purpose of the transceiver is to convert the transmit and receive lines of the processor UART into a single wire half-duplex data bus to allow the ECM to communicate on the vehicle bus.
It is no longer related to the CEL wire. This data bus allows for only one device to communicate at a time and connects all the major modules – BCM, ABS, SRS, ECM etc. In VR and VS applications the bus master is the ECM/PCM. Every device on the bus has a device ID, so when data packets are put on the bus it is ‘addressed’ to a particular device. This way only the device that is addressed process’s and responds to the packet, all the others ignore the data. PCM Device ID - $F4 for VR V8, VR V6 and VS V8.
$F5 for VS V6 BCM - $BD in VR and $F1 in VS ABS - $F9 SRS - $F2 VT – This is a very similar implementation to the VR and VS ALDL. It is also 8192 baud but the major difference is the bus master is no longer the PCM but instead the BCM.
Holden Commodore Aldl Software
The VT took the data bus further by also including the instrument cluster. A regular message containing all the dash information is sent at the request of the BCM. PCM Device ID - $F5 BCM - $F1 SRS - $FA VX and VY – The NA V6 uses a flash based PCM, this also added some new ALDL modes for the security system.
The PCM is linked to the BCM, ALDL is used for the linking process. PCM Device ID - $F7 for flash based PCM BCM - $F1 How It Works: Due to the different types of ALDL there are different ways to get data out of the ECM VN/VP – This is a uni-directional data link so to enable ALDL data a resistor must be placed from the diagnostic enable wire to ground.
This tells the ECM to start outputting data on the CEL wire. The disadvantage is on a factory memcal it also locks the spark advance to 10deg BTDC until 2000RPM, this can be disabled by editing the memcal binary. The data that is sent over 160baud ALDL is very basic and is a fixed data stream.
Aldl Commodore Software
It contains information on diagnosing faults and checking sensor outputs. VR/VS/VT – Being a bi-directional data link it is now possible and necessary to request data from the ECM/PCM. No resistor is required to tell the ECM to start transmitting data. The ECM does not lock the timing to 10deg BTDC when requesting data so it is possible to drive the vehicle like normal while logging. The 8192baud ALDL is far more useful than the 160baud data for many more reasons than just being faster. Hi guys, i've been able to log successfully ( i think ) using WinALDL on 34G for a while now and been trying to interpret what i get with mixed results and varying degrees of confusion.
Vt Commodore Aldl Software
Time, rpm, map, o2 (crossrefferencing with a af/r guage helped making sense of that ) BLM etc i think i have a reasonable grasp of. What i am having trouble with is where it tells me what the ignition timing is, the knock counts (shown on some comps supported but not the 808) and injector load (bpw?) now i'm sure theres going to be many of you going at me but sorry i'm more at ease with my dial back timing light and trying to drag myself out of the dark ages In advance of replies i'll say why the hell didn't i see that for myself you.