Possible Causes - Scan Tool Does Not Communicate With Can IHS
This diagnostic will not have Diagnostic Trouble Codes to assist in determining no scan tool communication with the vehicle.
| Possible Causes |
|---|
| FAULTY SCAN TOOL |
| DATA LINK CONNECTOR |
| CAN IHS (+) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| CAN IHS (-) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| POOR CONNECTION |
| STAR CONNECTOR |
| ANY MODULE ON THE CAN IHS BUS |
NORMAL CAN CIRCUIT VOLTAGE TABLE
| CIRCUIT | NORMAL VOLTAGE VALUES |
|---|---|
| CAN IHS (-) | 1.5 - 2.5 volts |
| CAN IHS (+) | 2.5 - 3.5 volts |
| Difference Between CAN IHS (+) and CAN IHS (-) | 0.5 volt |