For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Powertrain On Board Diagnostic (OBD) System Check--Performance Engine, or Powertrain On Board Diagnostic (OBD) System Check--Ram Jet Engine prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
DLC B+ | 1 | 1 | -- | -- |
DLC Ground | -- | 1 | -- | -- |
1. Scan Tool Does Not Power Up | ||||
Circuit/System Description
The data link connector (DLC) is a standardized 16 cavity connector. The connector is designed to provide the following:
| • | Scan tool B+ voltage at terminal 16 |
| • | Scan tool ground at terminal 4 |
| • | Common ground at terminal 5 |
Diagnostic Aids
| • | The scan tool will power up with the ignition OFF. The engine control module will not communicate unless the ignition is ON. |
| • | If the B+ circuit, ground circuits, and connections of the DLC are functioning properly, the malfunction must be due to the scan tool/CANdi module. |
Reference Information
Schematic Reference
Connector End View Reference
| • | Engine Control Module Connector End Views--Performance Engine |
| • | Engine Controls Connector End Views--Performance Engine |
| • | Engine Control Module Connector End Views--Ram Jet Engine |
| • | Engine Controls Connector End Views--Ram Jet Engine |
Engine Control Module Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
Scan Tool Reference
| • | Engine Control Module Scan Tool Information--Performance Engine for scan tool information. |
| • | Engine Control Module Scan Tool Information--Ram Jet Engine for scan tool information. |
Circuit/System Verification
Connect the scan tool to the data link connector (DLC). Attempt to power-up the scan tool. The scan tool should power-up.
Circuit/System Testing
- Ignition OFF, test for less than 2 ohms between the following ground circuits terminals of the DLC and ground:
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 16 at the DLC and ground.
- If all circuits test normal, refer to the scan tool/CANdi module user guide.
| • | terminal 4 |
| • | terminal 5 |
| ⇒ | If greater than the specified range, repair the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
