Need some help guys, I finished putting my car back together and now the diagnostics port wont work. Tried both my scanmaster and HPP. I had to rewire the blue connector on the PCM, and i rewired my entire nitrous system I'm sure one of those things has somthing to do with it. But i have no idea where to start on this.

TIA
Jim

 

Check the fuses. I think it's the gauges fuse in the box inside the driver's door. I had that happen to me after blowing a fuse from my nitrous setup.

 

Scan Tool Does Not Communicate w/Class 2 Data Line

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">
Step 1

Use a DMM in order to measure the voltage between B+ and DLC terminal 5.

Is the voltage within the specified range?

Specified Range = B+ (9-14 V)
--
Yes: Go to Step 2
No: Go to Step 3

Step 2

Inspect for a proper connection of the scan tool to the DLC.

Is the connection OK between the scan tool and the DLC?
--
Yes: Go to Step 6
No: Go to Step 7

Step 3

Does the instrument cluster display work?
--
Yes: Go to Step 4
No: Go to Step 5

Step 4

Repair the poor connection or open in circuit 451 between the DLC and S215.

Has the repair been made?
--
Yes: Go to Step 17
--

Step 5

Repair the poor connection or open in circuit 451 between S215 and G110.

Has the repair been made?
--
Yes: Go to Step 17
--

Step 6

Use the scan tool in order to establish communication with the PCM on a different vehicle.

Can communication be established with the scan tool?
--
Yes: Go to Step 8
No: Go to Step 9

Step 7

Repair the poor connection between the DLC and the scan tool.

Is the repair complete?
--
Yes: Go to Step 17
--

Step 8

1) Reconnect the scan tool to the DLC.
2) Turn the ignition switch to RUN.
3) Use a scan tool in order to establish communication with the Powertrain Control Module (PCM).

Can the scan tool communicate with the PCM?
--
Yes: Go to Step 10
No: Go to Step 11

Step 9

Determine if the scan tool is malfunctioning.

Refer to the scan tool instruction manual for additional information.

Is the action complete?
--
Yes: Go to Step 17
--

Step 10

1) If malfunction is not present or intermittent, inspect the PCM connector for a poor connection, short to B+, or short to ground in CKT 1807.
2) Repair as necessary.

Is the action complete?
--
Yes: Go to Step 17
--

Step 11

1) Turn the ignition switch to the OFF position.
2) Disconnect the PCM connector C1 (V6 VIN K) or C2 (V8 VIN G).
3) Use a DMM in order to measure the resistance between the DLC terminal 2 and the DLC terminal 5.

Is the resistance the same as the specified value?

Specified Velue = Infinite
--
Yes: Go to Step 12
No: Go to Step 13

Step 12

1) Turn the ignition switch to RUN.
2) Use a DMM in order to measure the voltage between the DLC terminal 2 and the DLC connector terminal 5.

Is the voltage less than the specified value?

Specified Value = 1 V
--
Yes: Go to Step 14
No: Go to Step 15

Step 13

Repair the short to ground in CKT 1807.

Is the repair complete?
--
Yes: Go to Step 17
--

Step 14

Check continuity in circuit 1807 between the DLC terminal 2 and the PCM connector C1 terminal 59 (V6 VIN K) or connector C2 terminal 58 (V8 VIN G).

Is there continuity?
--
Yes: Refer to PCM
No: Go to Step 16

Step 15

1) Turn the ignition switch to the OFF position.
2) Repair the short to voltage in CKT 1807.

Is the repair complete?
--
Yes: Go to Step 17
--

Step 16

Repair the poor connection or an open in CKT 1807.

Is the repair complete?
--
Yes: Go to Step 17
--

Step 17

1) Ensure that the ignition switch is in the OFF position.
2) Reinstall connectors/components removed.

Is the action complete?
--
Yes: Go to Data Link Communications System Check</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

 

I had that happen. Check the cigarette ligher fuse. If it's blown the diag. port won't work. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />