Printer-friendly version
Glossary of terms you will come across during your Phase 2 training.

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O
P | Q | R | S | T | U | V | W | X | Y | Z | ALL



OBD pinoutThe SAE J1850 bus is used for diagnostics and data sharing applications in vehicles.

The J1850 interface takes two forms:

  1. A 41.6 Kbps Pulse Width Modulated (PWM) two wire differential approach, used by Ford. The connector will have contacts in pins 2, 4, 5, and 10, with no contact in pin 16.
  2. A 10.4 Kbps Variable Pulse Width (VPW) single wire approach, used by GM. The connector will have contacts in pins 2, 4, 5, and 16, with no contact in pin 10.
    The single wire approach may have a bus length up to 35 meters (with 32 nodes).

The J1850 interface was developed in 1994, and may be phased out for new designs. The J1850 is a class B protocol.


The SAE J1939 Standards Collection

SAE's J1939 standards family is the preferred controller area network (CAN) for equipment used in industries ranging from agriculture, construction, and fire/rescue to forestry, materials handling, and on- and off-highway.

Why Use J1939 Standards?

The J1939 standards family is maintained to ensure CAN device interoperability. J1939, the top-level document in the collection, is the master control for definitions common to many applications and industries, while companion documents explain component rationalization and product standardization for a particular application or industry. Communication systems designed according to J1939 standards are EMI/RFI tolerant, free of connection wires, easy to install, and feature log, record, remote access, and self-diagnosis capabilities.

Advantages of J1939 Datalink:

  • Uses less wiring
  • Lower weight
  • Lower cost 
  • Fewer connections 
  • Increased reliability 
  • Easier to install 
  • Improved quality of signal
  • Can transfer large amounts of data

OBDII pinoutThe standard laid out for the OBDII connector.

  1. Manufacturer discretion. GM: J2411 GMLAN/SWC/Single-Wire CAN.
  2. Bus positive Line of SAE-J1850 PWM and SAE-1850 VPW
  3. Ford DCL(+) Argentina, Brazil (pre OBD-II) 1997-2000, Usa, Europe, etc.
  4. Chassis ground
  5. Signal ground
  6. CAN high (ISO 15765-4 and SAE-J2284)
  7. K line of ISO 9141-2 and ISO 14230-4
  8. -
  9. -
  10. Bus negative Line of SAE-J1850 PWM only (not SAE-1850 VPW)
  11. Ford DCL(-) Argentina, Brazil (pre OBD-II) 1997-2000, Usa, Europe, etc.
  12. -
  13. -
  14. CAN low (ISO 15765-4 and SAE-J2284)
  15. L line of ISO 9141-2 and ISO 14230-4
  16. Battery voltage
From the Society of Automotive Engineers, SAE, J2284 defines the specific version of the CAN bus used on the OBD II connector on a vehicle.

Company contact for Pat O'Donnell and Company Ltd.

Telephone: 01 6161 000



Japanese Industrial Standard.

Check here and/or here for more information.

Jubilee clipThese are also known as hose clips, and are usually found in the cooling or fuel systems of plant vehicles. They are used to keep hoses tightly in place.
Junior hacksawSmall version of a hacksaw.