For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the System Check? | -- | Go to Step 2 | Go toData Link Communications System Check
2 | Attempt to establish communication with the same system on a different vehicle. Can you establish communication? | -- | Go to Step 3 | Go to Step 4
3 |

1. Turn the ignition switch to the OFF position.
2. Inspect for the correct connection of the scan tool to the data link connector.

Is the connection good?

--

Go to Step 5

Go to Step 6

4 | The scan tool may be malfunctioning. Refer to Scan Tool Instruction Manual. Is the repair complete? | -- | Go toData Link Communications System Check | --
5 | Measure the resistance of the data link connector (DLC-OBD II) from terminal 9 to terminal 5. Does the J 39200 display OL? | -- | Go to Step 7 | Go to Step 8
6 | Repair the data link connector terminal 9, or reconnect the scan tool as necessary. Is the repair complete? | -- | Go toData Link Communications System Check | --
7 | Measure the voltage of the data link connector (DLC-OBD II) from terminal 9 to terminal 5. Did you measure any voltage? | -- | Go to Step 10 | Go to Step 9
8 | Repair a short to ground in the PPL wire or in the PPL/WHT wire between the following components:

• | The EBCM

• | The SDM

• | The data link connector (DLC-OBD II)

Is the repair complete?

--

Go toData Link Communications System Check

--

9 | Measure the voltage on the data link connector (DLC-OBD II) from terminal 16 to ground. Did you measure the system voltage? | -- | Go to Step 11 | Go to Step 12
10 | Repair a short to voltage in the PPL wire or in the PPL/WHT wire between the following components:

• | The EBCM

• | The SDM

• | The data link connector (DLC-OBD II)

Is the repair complete?

--

Go toData Link Communications System Check

--

11 |

1. Inspect for an open in the PPL wire or the PPL/WHT wire between the following components:

• | The EBCM

• | The SDM

• | The data link connector

2. If the wires are OK, refer to ABS in order to diagnose the EBCM. Refer to SIR Diagnostic System Check in SIR in order to diagnose the SDM.

Is the repair complete?

--

Go toData Link Communications System Check

--

12 | Repair the open in the WHT wire between the junction block and the data link connnector. Is the repair complete? | -- | Go toData Link Communications System Check | --