Possible Causes - Scan Tool Does Not Communicate With Can IHS
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 |