Test Y EBCM/EBTCM Problem

Antilock Brake System And Traction Control System Wiring Diagram:

Y: EBCM/EBTCM Problem Test:

OPERATION:
When the ignition switch is first turned to RUN, the EBTCM goes through a self test. During this test, the EBTCM grounds both the ANTI LOCK and TRACTION OFF indicators for approximately 2 to 4 seconds. This acts as a bulb test for the indicators.

The EBTCM monitors transaxle temperature through the transaxle temperature switch. When the transaxle becomes hot, about 160°C (320°F), the normally closed switch opens, signaling the EBTCM to disable the traction control system and turn on the TRACTION OFF indicator. This allows the brakes and transaxle to cool down. As the transaxle cools to 149°C (300°F),the transaxle temperature switch closes. The EBTCM keeps the TRACTION OFF indicator on and the system disabled for an additional three to five minutes to allow for sufficient cooling.

POSSIBLE CAUSES:

NOTE: When vehicle is equipped with traction control, any symptom which lights the ANTI LOCK indicator also lights the TRACTION OFF indicator. Therefore, when both indicators are lit, follow ANTILOCK indicator diagnosis when no codes are set.

Short to ground in CKT 1572.
Open in CKT 1660.
Faulty transaxle temperature switch.