Possible Causes - Scan Tool Does Not Communicate With Can IHS
WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic will not have Diagnostic Trouble Codes (DTCs) to assist in determining no scan tool communication with the vehicle.
| Possible Causes |
|---|
| INOPERATIVE SCAN TOOL |
| DATA LINK CONNECTOR (DLC) |
| CAN IHS (+) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| CAN IHS (-) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| POOR TERMINAL CONTACT OR CONNECTOR CONNECTION(S) |
| STAR CONNECTOR |
| ANY MODULE ON THE CAN IHS BUS |
NORMAL CAN IHS BUS CIRCUIT VOLTAGE TABLE
| CIRCUIT | NORMAL VOLTAGE VALUES |
|---|---|
| CAN IHS BUS (-) | 1.5 - 2.5 volts |
| CAN IHS BUS (+) | 2.5 - 3.5 volts |
| Difference Between CAN IHS BUS (+) and CAN IHS BUS (-) | 0.5 volt |