Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 4: The battery positive voltage and ground circuits of the DLC are functioning properly. The malfunction must be due to the scan tool.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Data Communication Schematics (WHB) or Data Communication Schematics (without WHB) | |||
| 1 | Test the battery positive voltage circuit of the data link connector (DLC) for an open or short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 5 | Go to Step 2 |
| 2 | Test the ground circuit or the DLC for an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 5 | Go to Step 3 |
| 3 | Inspect for poor connections at the DLC ground terminals and the DLC power terminals at the DLC. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 5 | Go to Step 4 |
| 4 | The scan tool may be malfunctioning. Refer to the scan tool user guide. Did you obtain a properly operating scan tool? |
Go to Step 5 | - |
| 5 | Does the scan tool power up? | Go to Diagnostic System Check - Vehicle | Go to Step 1 |