Test Q Data Line

Antilock Brake System And Traction Control System Wiring Diagrams:

Q: Data Line Test:

FOR UPDATED INFORMATION NOT INCLUDED HERE, REFER TO TSB #9389, DATED JAN. 93

OPERATION:
When the Ignition switch is first turned to RUN, the EBCM/EBTCM goes through a self-test lasting 2-4 seconds. During this test, the EBCM/EBTCM grounds terminal 52, causing the amber ANTILOCK Indicator to light. This serves as an indicator bulb test.

When a low fluid condition exists, the EBCM/EBTCM turns on the amber ANTILOCK Indicator but does not set a code. A low fluid level condition usually lights the red BRAKE Indicator since the master cylinder supplies the PMV reservoir. However, restrictions or air in the hose could cause a low fluid condition in the PMV reservoir without lighting the red BRAKE Indicator.

POSSIBLE CAUSES:
Open In CKT 650, 800, 803, 849 or 853.
Low brake fluid level or open PMV fluid level switch.
Short to ground In CKT 650, 800 or 852.
See Electrical Schematic Part 1 of 3 to CKT 803 at Main Relay