Circuit/System Description
The data link connector (DLC) is a standardized 16 cavity connector.
Connector design and location is dictated by an industry wide standard, and is required
to provide the following:
| • | Scan tool power battery positive voltage at terminal 16 |
| • | Scan tool power ground at terminal 4 |
| • | Common signal ground at terminal 5 |
Diagnostic Aids
| • | The scan tool will power up with the ignition OFF. Some modules however,
will not communicate unless the ignition is ON and the power mode master (PMM) module
sends the appropriate power mode message. |
| • | If the battery positive voltage, ground circuits and connections of the
DLC are functioning properly, the malfunction must be due to the scan tool/CANdi module. |
| • | Use the DMM MIN/MAX function to capture/locate intermittent conditions. |
Reference Information
Schematic Reference
Data Communication Schematics
Connector End View Reference
Component Connector End ViewsComponent Connector End Views
Electrical Information Reference
Circuit/System Testing
- Ignition ON, test for battery voltage between the battery positive voltage
circuit of the DLC and ground.
| ⇒ | If less than battery voltage, repair the voltage supply circuit for a short
to ground or an open/high resistance. |
- Test for less than 1.0 ohm of resistance between the ground circuit of
the DLC and ground.
| ⇒ | If greater than 1.0 ohm, repair the ground circuit for an open/high resistance. |
- If all tests normal, refer to the scan tool/CANdi module user guide.
Repair Instructions
Perform the
Diagnostic Repair VerificationDiagnostic Repair Verification .
