What OBD protocol does GM use?
SAE J1850 VPW
As a rule of thumb, GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). Chrysler products and all European and most Asian imports use ISO 9141 or KWP2000 circuitry.
Are all OBD II connectors the same?
All OBD-II pinouts use the same connector, but different pins are used with the exception of pin 4 (battery ground) and pin 16 (battery positive).
What year did GM switch to OBD2?
All cars and light trucks built and sold in the United States after January 1, 1996 were required to be OBD II equipped. In general, this means all 1996 model year cars and light trucks are compliant, even if built in late 1995.
Can I use OBD2 on OBD1?
Typically obd2 scanners can not read obd 1 data, even with an adapter cable. If your looking to just pull codes then jumpering terminals A and B at the ALDL connector under the dash and counting the check engine light flashes is the most reliable way to get codes from and obd1 gm.
What is K line and L line in OBD2?
The K-Line is suitable for both on-board and off- board diagnostics. K-Line is a bidirectional line. Line-L is a unidirectional line and used only during initialization to convey address information from the diagnostic tester to vehicle ECUs, simultaneously with the K line.
What is K line and L line?
The K-Line is suitable for both on-board and off- board diagnostics. K-Line is a bidirectional line. Line-L is a unidirectional line and used only during initialization to convey address information from the diagnostic tester to vehicle ECUs, simultaneously with the K line. …
Which is better OBD1 or OBD2?
OBD2 is remotely used to diagnose ports, and reads data through a Bluetooth connection. As such, it is easier to diagnose a problem remotely if you have a car made with an OBD2 system. OBD1 has good diagnostic capabilities, while OBD2 has better signalling protocols and messaging formats.
Which OBD scanner is best?
#1 Best Overall: Launch CRP129E Scan Tool. #2 Best Bluetooth Scanner: BlueDriver Bluetooth Pro OBDII Scan Tool. #3 Best Budget Scanner: Foxwell NT301 OBD2 Scanner. #4 Autel MaxiCOM MK808 Scanner.