For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Install the scan tool.
2. Turn ON the scan tool.

Does the scan tool turn ON?

--

Go to Step 7

Go to Step 2

2 |

1. Disconnect the scan tool from the data link connector (DLC).
2. Test for voltage at DLC terminal 16.

Is the measured voltage within the specified value?

11 - 13 V

Go to Step 4

Go to Step 3

3 | Locate and repair an open in the DLC power circuit. Is the repair complete? | -- | Go to Step 6 | --
4 |

1. Measure the resistance between DLC terminal 4 and ground.
2. Measure the resistance between DLC terminal 5 and ground.

Is the resistance for both terminals within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5 | Locate and repair an open in the DLC ground circuit. Is the repair complete? | -- | Go to Step 6 | --
6 | Verify scan tool operation. NOTE: The scan tool may be malfunctioning if it continues not to operate properly, refer to the scan tool instruction manual. Did you obtain a properly operating scan tool? | -- | Go to the applicable Diagnostic System Check | --
7 |

1. Problem is not current at this time.
2. Inspect for poor connections/terminal tension at the DLC terminals 4 and 16. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to the applicable Diagnostic System Check

Go to Step 6