Circuit Description
The serial data class 2 allows all of the modules on the line to transmit information to each other as needed. Each module is assigned an ID. All of the information sent out on the line is assigned a priority by which the information is received. When the ignition switch is turned to the RUN position, each module begins to send and receive information. Each module on the serial data class 2 knows what information the module needs to send out and what information the module should be receiving. What the modules do not know is which module is supposed to send the information. This information is only learned after the module has received the information needed along with the ID of the module that sent the information. This information is then remembered until the ignition switch is turned OFF.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: Scan tool can not communicate with the EBCM/EBTCM. | ||||
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 | Turn the Ignition switch to the RUN position with the engine OFF. Can the scan tool communicate with other modules on serial data class 2, such as the PCM? | -- | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Data Line in Data Link Communications |
3 | Inspect the 10 A ABS Fuse in the IP fuse block. Is the fuse OK? | -- | Go to Step 4 | Go to Step 8 |
4 | Inspect the 40 A ABS SOL Fuse in the underhood maxifuse block. Is the fuse OK? | -- | Go to Step 10 | Go to Step 5 |
5 |
Is the resistance equal to the specified value? | OL (Infinite) | Go to Step 6 | Go to Step 7 |
6 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |
7 | Repair CKT 342 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 |
Is the resistance equal to the specified value? | OL (Infinite) | Go to Step 6 | Go to Step 9 |
9 | Repair CKT 441 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
10 |
Is the voltage within the specified range? | Battery Voltage | Go to Step 11 | Go to Wiring Repairs in Wiring Systems |
11 | Using the J 39200 DMM, measure the voltage at the 40 A ABS SOL Fuse by probing between the fuse test terminals and a good ground. Is the voltage within the specified range? | Battery Voltage | Go to Step 12 | Go to Wiring Repairs in Wiring Systems |
12 |
Is the resistance less than the specified value? | 2 ohms | Go to Step 14 | Go to Step 13 |
13 | Repair CKT 1150 or G104 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
14 |
Is the voltage within the specified range? | Battery Voltage | Go to Step 16 | Go to Step 15 |
15 | Repair CKT 441 for an open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
16 | Using the J 39200 DMM, measure the voltage between the J 39700 terminal D and terminal B. Is the voltage equal to the specified value? | Battery Voltage | Go to Step 6 | Go to Step 17 |
17 | Repair CKT 342 for an open. an open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
