Scan Tool Does Not Power Up

*SCAN TOOL DOES NOT POWER UP









For a complete Data Link Connector Circuit Diagram, Communications.

Diagnostic Test

1. MEASURE THE VOLTAGE OF THE DLC POWER CIRCUIT
NOTE: If the LEDs do not light or no sound is emitted at start up, check for loose cable connections or a bad cable. Check the vehicle battery voltage (data link 16-way connector cavity 16). A minimum of 11 volts is required to adequately power the scan tool. Check for a proper ground at DLC cavity 4. If all connections are proper between the scan tool and the vehicle or other devices and the vehicle battery is fully charged, an inoperative scan tool may be the result of a faulty cable.





Turn the ignition off.
Measure the voltage of the Fused B(+) circuit at cavity 16 of the Data Link Connector.
Is the voltage above 11 volts?

Yes

- Go to 2

No

- System voltage must be above 11 volts. Check Fuse 14 in the Underhood Accessory Fuse Block. Repair the voltage concern as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test

2. MEASURE THE RESISTANCE OF THE DLC GROUND CIRCUIT




Measure the resistance between ground the Ground circuit at cavity 4 of the Data Link Connector.
Is the resistance below 5.0 ohms?

Yes

- Inspect the scan tool for a possible malfunction.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Repair the DLC Ground circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test