i can't get a link connection from my reader so i can see any codes my truck won;t start

Asked by Apr 23, 2012 at 11:16 PM about the 1996 Dodge Ram 1500 2 Dr LT Standard Cab LB

Question type: Maintenance & Repair

4 Answers

7,425

If you cant ge ta connection sounds like the B+ circuit is open.

7 people found this helpful.
13,845

The scanner you are using might not be the correct protocol. Two factors will show if your vehicle is definitely OBD II equipped: 1) There will be an OBD II connector 2) There will be a note on a sticker or nameplate under the hood: "OBD II compliant". The Connector Pin 2 - J1850 Bus+ Pin 4 - Chassis Ground Pin 5 - Signal Ground Pin 6 - CAN High (J-2284) Pin 7 - ISO 9141-2 K Line Pin 10 - J1850 Bus Pin 14 - CAN Low (J-2284) Pin 15 - ISO 9141-2 L Line Pin 16 - Battery Power The big scanner consoles include the decoding software and firmware for all five protocols in their units, making them universal. Less expensive units, for home or small shop use, are usually customized for a specific communications protocol. Be sure the scanner you are using suits the protocol of your car. 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. Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns. All 2008 and newer year vehicles use CAN. On 1996 and later vehicles, you can tell which protocol is used by examining the OBD II connector: J1850 VPW --The connector should have metallic contacts in pins 2, 4, 5, and 16, but not 10. ISO 9141-2/KWP2000 --The connector should have metallic contacts in pins 4, 5, 7, 15, and 16. J1850 PWM --The connector should have metallic contacts in pins 2, 4, 5, 10, and 16. CAN --The connector should have metallic contacts in pins 4, 5, 6, 14 and 16.

15 people found this helpful.
7,425

Its a 96 Ram it IS OBD 2 compliant- wow you can copy and paste things.

3 people found this helpful.

Well thanks. I find that information useful. Finally. I can't believe all these different kinds of obd2 ports exist. People need to start listing this information on the dongles. Which one is it for? I don't know which one it's even for. My Bluetooth dongle only has pins 1,2,3,4,5 and 9,10,11. The others are not connected to the board. That might be my problem wrong protocol.

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