Scan Tool Does Not Communicate with Components Diesel Engine
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Attempt to establish communication with the same system on a different vehicle. Is communication established? | -- | Go to Step 2 | Go to Step 3 |
2 |
Is the connection good? | -- | Go to Step 4 | Go to Step 5 |
3 | The scan tool may be malfunctioning. Refer to the scan tool instruction manual. Is communication established? | -- | Go to Step 4 | -- |
4 |
Can communications be established? | -- | Go to Step 6 | Go to Step 7 |
5 | Repair the data link connector. Does the scan tool communicate with the components? | -- | System OK | Go to Step 8 |
6 |
Is there a proper connection? | -- | Go to Step 9 | Go to Step 10 |
7 |
Does the DMM display OL (infinite)? | -- | Go to Step 11 | Go to Step 12 |
8 | Reconnect the scan tool as necessary. Does the scan tool communicate with the components? | -- | System OK | -- |
9 | Use a DMM to measure the resistance between the data link connector and the serial data line terminals in the affected module harness connector. Is the resistance less than the specified value? | 5.0 ohms | Go to Step 13 | Go to Step 14 |
10 | Ensure the proper connection. Is the repair completed? | -- | Go to Step 9 | -- |
11 |
Does the DMM read voltage (any value)? | -- | Go to Step 15 | Go to Step 16 |
12 | Repair the short to ground in the affected serial data line. Does the scan tool communicate with the components? | -- | System OK | -- |
13 | Repair the open in the affected serial data line circuit between the data link connector and the disconnected module harness connector. Does the scan tool communicate with the components? | -- | System OK | -- |
14 | Check for power and ground to the module. Are the power and ground OK? | -- | Go to Step 17 | -- |
15 | Repair the short to voltage in the affected serial data line. Is the repair completed? | -- | System OK | -- |
16 |
Can communication be established? | -- | System OK | Go to Step 18 |
17 | Replace the affected module. Does the scan tool communicate with the components? | -- | System OK | -- |
18 | Replace the most recently connected module. Repeat this procedure until the malfunctioning module is isolated. Does the scan tool communicate with the components? | -- | System OK | -- |
Scan Tool Does Not Communicate with Components Gasoline Engine
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Are communications established? | -- | Go to Step 2 | Go to Step 3 |
2 | Connect a test lamp from terminal 4 to B+. Did the test lamp light? | -- | Go to Step 4 | Go to Step 5 |
3 | The scan tool may be malfunctioning. Refer to the scan tool instruction manual. Can connections be established? | -- | Go to Step 2 | -- |
4 | Connect a test lamp from terminal 5 to B+. Did the test lamp light? | -- | Go to Step 6 | Go to Step 7 |
5 | Repair the open in CKT 150 (BLK) between the DLC and G102. Does the scan tool communicate with the components? | -- | System OK | -- |
6 |
Is the resistance more than the specified value for either check? | 5.0 ohms | Go to Step 8 | Go to Step 9 |
7 | Repair the open in CKT 451 (BLK/WHT) between the DLC and G106. Does the scan tool communicate with the components? | -- | System OK | -- |
8 |
Does the DMM register voltage (any value) for either check? | -- | Go to Step 10 | Go to Step 11 |
9 | Repair the short to ground in the affected circuit between the DLC and the powertrain control module (PCM). Does the scan tool communicate with the components? | -- | System OK | -- |
10 | Repair the short to voltage in the affected circuit. Does the scan tool communicate with the components? | -- | System OK | -- |
11 |
Does the DMM register voltage (any value)? | -- | Go to Step 12 | Go to Step 13 |
12 | Repair the short to voltage in CKT 799 (TAN/WHT) between the DLC and the EBCM. Does the scan tool communicate with the components? | -- | System OK | -- |
13 |
Is the resistance less than the specified value? | 5.0 ohms | Go to Step 14 | Go to Step 15 |
14 | Repair the short to ground in CKT 799 (TAN/WHT) between the DLC and the EBCM. Does the scan tool communicate with the components? | -- | System OK | -- |
15 |
Does the DMM register battery voltage? | -- | Go to Step 16 | Go to Step 17 |
16 |
Is the repair completed? | -- | Go to Step 18 | -- |
17 | Repair the open in CKT 140 (ORN) between the DLC and the HORNS circuit breaker. Does the scan tool communicate with the components? | -- | System OK | -- |
18 | Use a DMM to measure the resistance between the data link connector and the serial data line terminal(s) in the affected module harness connector. Does the DMM register resistance equal or less than the specified value? | 5.0 ohms | Go to Step 19 | Go to Step 20 |
19 | Repair the open in the affected serial data line circuits(s) between the data link connector and the disconnected module harness connector. Does the scan tool communicate with the components? | -- | System OK | -- |
20 | Check for power and ground in the module. Are the power and ground OK? | -- | Go to Step 21 | -- |
21 | Replace the affected module. Does the scan tool communicate with the components? | -- | System OK | -- |
