GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1998 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Scan Tool Does Not Communicate with Components

Scan Tool Does Not Communicate with Components EBCM (Hydraulic)

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the scan tool from the vehicle.
  2. Connect the scan tool to a vehicle with the same system.
  3. Attempt to establish communications.

Were communications established?

--

Go to Step 2

Refer to the scan tool instruction manual

2

Backprobe the DLC using a test lamp from terminal 16 to ground.

Did the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 408 (ORN) between the IP fuse block and the DLC.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 4

4

Backprobe the DLC using a test lamp from terminal 16 to terminal 4.

Did the test lamp light?

--

Go to Step 6

Go to Step 5

5

Repair the open in CKT 411 (BLK) between the DLC and joint connector 1.

Will the Scan Tool communicate with the EBCM?

--

System OK

Go to Step 6

6

Using a self-powered test lamp, backprobe the DLC from terminal 12 to the EBCM terminal 5.

Did the test lamp light?

--

Go to Step 8

Go to Step 7

7

Repair the open in CKT 396 (BRN/WHT) or CKT 799 (TAN/WHT) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 8

8

Using a self powered test lamp, backprobe the DLC from terminal 12 to terminal 4.

Did the test lamp light?

--

Go to Step 9

Refer to Antilock Brakes

9

Repair the short to ground in CKT 396 (BRN/WHT) or CKT 799 (TAN/WHT) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

--

Scan Tool Does Not Communicate with Components EBCM (Air)

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the scan tool from the vehicle.
  2. Connect the scan tool to a different vehicle with the same system.
  3. Attempt to establish communications.

Were communications established?

--

Go to Step 2

Refer to the scan tool instruction manual

2
  1. Using a J 39200 DMM, backprobe the DLC from terminal 16 to ground.
  2. Measure the voltage.

Was the voltage less than the specified value?

10.0 V

Go to Step 3

Go to Step 4

3

Repair the open in CKT 408 (ORN) between the IP fuse block and the DLC.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 4

4
  1. Using a J 39200 , backprobe the DLC from terminal 16 to terminal 4.
  2. Measure the voltage.

Was the voltage less than the specified value?

10.0 V

Go to Step 5

Go to Step 6

5

Repair the open in CKT 411 (BLK) between the DLC and joint connector 1.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 6

6
  1. Using a J 39200 , backprobe the DLC from terminal 7 to the EBCM terminal A3.
  2. Measure the resistance.

Was the resistance more than the specified value?

5.0 ohms

Go to Step 7

Go to Step 8

7

Repair the open in CKT 410 (BLU) or CKT 1921 (DK BLU) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 8

8
  1. Using a J 39200 , backprobe the DLC from terminal 7 to terminal 4.
  2. Measure the resistance.

Was the resistance less than the specified value?

10M ohms

Go to Step 9

Go to Step 10

9

Repair the short to ground in CKT 410 (BLU) or CKT 1921 (DK BLU) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 10

10
  1. Using a J 39200 , backprobe the DLC from terminal 15 to the EBCM terminal B3.
  2. Measure the resistance.

Was the resistance more than the specified value?

5.0 ohms

Go to Step 11

Go to Step 12

11

Repair the open in CKT 409 and CKT 1922 (LT GRN) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

Go to Step 12

12
  1. Using a J 39200 , backprobe the DLC from terminal 15 to terminal 4.
  2. Measure the resistance.

Was the resistance more than the specified value?

10M ohms

Go to Step 13

Refer to Antilock Brakes

13

Repair the short to ground in CKT 409 and CKT 1922 (LT GRN) between the DLC and the EBCM.

Will the scan tool communicate with the EBCM?

--

System OK

--