All cars and light trucks sold in the US after 1996 must be OBD-II compliant. However, the European Union’s OBD regulations are more complex. Determining compatibility for a 2002 Nissan Sunny, often referred to as an “Astra Obdii 2002 Sunny” in online searches, requires understanding OBD-II protocols and diagnostic link connectors (DLCs).
OBD-II compliant vehicles use one of five communication protocols: J1850 PWM, J1850 VPW, ISO9141-2, ISO14230-4 (Keyword Protocol 2000), and ISO15765-4/SAE J2480 (CAN). While US manufacturers couldn’t use CAN until 2003, all vehicles from 2008 onward utilize it. A 2002 model is likely to use one of the earlier protocols.
Identifying the OBDII Protocol in Your Astra OBDII 2002 Sunny
There are two DLC types defined by SAE J1962: Type A and Type B. They differ primarily in the alignment tab’s shape. J1962 specifies both types should be easily accessible within the driver’s compartment.
Fig. 1 – J1962 Vehicle Connector, Type A
Fig. 2 – J1962 Vehicle Connector, Type B
You can usually determine your vehicle’s protocol by examining the DLC pinout:
Fig. 3 – OBDII Connector Pinout Diagram
This table outlines how to identify the protocol:
| Pin 2 | Pin 6 | Pin 7 | Pin 10 | Pin 14 | Pin 15 | Standard |
|---|---|---|---|---|---|---|
| must have | – | – | must have | – | – | J1850 PWM |
| must have | – | – | – | – | – | J1850 VPW |
| – | – | must have | – | – | may have* | ISO9141/14230 |
| – | must have | – | – | must have | – | ISO15765 (CAN) |
*Pin 15 (“L-line”) is optional in newer vehicles using ISO9141-2 or ISO14230-4.
Besides pins 2, 7, 10, and 15, the connector should have pins 4 (Chassis Ground), 5 (Signal Ground), and 16 (Battery Positive). This further clarifies protocol identification:
PWM: Connector must have pins 2, 4, 5, 10, and 16.
VPW: Connector must have pins 2, 4, 5, and 16, but not pin 10.
ISO: Connector must have pins 4, 5, 7, and 16. Pin 15 may be present.
CAN: Connector must have pins 4, 5, 6, 14, and 16. This is less likely for a 2002 Sunny.
Locating the DLC and checking these pins will help you determine the OBD-II protocol for your astra obdii 2002 sunny. This information is crucial for selecting compatible diagnostic tools and software. For further information, consult resources detailing OBD-II protocols by manufacturer.
