Troubleshooting - GMC MDI 2 User Manual

Multiple Diagnostic Interface 2 User Guide

Troubleshooting

This section is intended to help you get back on track if the MDI 2 appears to be operating abnormally.
In addition, the most likely cause for the condition is given as well as other possible causes and
recommendations on how to isolate or eliminate the problem.
MDI 2 Does Not Pass Power On Self-Test (POST)
Most Likely Cause: Internal problem in the MDI 2.
Recommendations:
Connect the MDI 2 to a PC using USB and perform the recovery procedure.
MDI 2 Error LED Lights After Power On
Most Likely Cause:
A problem has been detected during power on.
Recommendations:
Power down the MDI 2 and verify that it has the same problem when you power up again.
Connect the MDI 2 to a PC using USB and perform the recovery procedure.
MDI 2 Fails to Power Up
The MDI 2 should power up as soon as external power is applied. If the MDI 2 does not turn on,
first check the power cable connections. Try supplying power to the MDI 2 from different power
sources— the vehicle DLC connector or USB.
Recommendations:
Check that the cables are securely attached to the MDI 2 and the connector pins are clean.
If connecting to the vehicle DLC connector, try powering via USB.
Verify power at the DLC connector.
MDI 2 Vehicle LED is Blinking Red
If the MDI 2 does not detect 12V on Pin 16 of the DLC cable, the MDI 2 will inform the user by
automatically turning on and blinking the Vehicle LED red. This condition might be seen if the
MDI 2 is only powered by a 5V USB connection or if the DLC Cable has accidently been
displaced from the vehicle Data Link Connector and is powered from the backup capacitor.
When the MDI 2 detects 12V on Pin 16, the Vehicle LED will stop blinking red.
Recommendations:
Ensure 12V is applied to Pin 16 of the DLC cable
26