Tracker 4WD L4-2.0L VIN C (1999)
Scan Tool Does Not Communicate With EBCM
CIRCUIT DESCRIPTION
The service technician must begin diagnosis of any ABS complaint with the ABS Diagnostic System Check.
The diagnostic system check directs the service technician to the next logical step in diagnosing the complaint.
DIAGNOSTIC AIDS
Communication with the EBCM is not possible when excessive resistance exists in the following components:
^
Grounds
^
The power supply circuits
If communication with the EBCM is not possible, perform the following actions:
^
Verify that the EBCM ground connection is good.
^
Verify that no excessive resistance exists in any of the power supply circuits.
The following list contains items that need to be inspected when diagnosing this system:
^
Open DEF Fuse
^
Open ABS Fuse
^
Clean, tight G200
Excessive resistance in the following circuits will not allow communication with the EBCM:
^
Battery feed
^
Switched ignition
^
Ground
^
Serial data line
If communication with the EBCM is not possible with a scan tool, ensure these circuits are in good condition and that there is no excessive resistance.
Also check the EBCM connectors for poor connector terminal contact. Refer to Data Link Communications System Check in Data Link
Communications. See:
If an intermittent malfunction exists, refer to Diagrams / Testing for Intermittent and Poor Connections.
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This test determines if the scan tool can communicate with any other modules on the serial data line.
4. Tests for a short to ground in the ignition positive voltage circuit.
