BR–77 BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS) DTC 15 16 TRAC Solenoid Relay Circuit CIRCUIT DESCRIPTION This relay circuit supplies power to each traction actuator solenoid. When the ignition switch is turned ON, the relay goes on. DTC No. | Diagnostic Trouble Code Detecting Condition | Trouble area 15 Conditions (1) through (3) continue for 0.2 sec. or more: (1) TRAC solenoid relay terminal (TSR) voltage: Battery positive voltage (2) All TRAC actuator solenoids: OFF (3) All TRAC actuator solenoid monitor voltages (in ECU): 0 V TRAC solenoid relay Open or short in TRAC solenoid relay circuit ECU 16 Conditions (1) through (3) continue for 0.2 sec. or more: (1) TRAC solenoid relay terminal (TSR) voltage: 0 V (2) All TRAC actuator solenoids: OFF (3) TRAC actuator solenoid monitor voltage (in ECU): Battery positive voltage TRAC solenoid relay B+ short in TRAC solenoid relay circuit ECU Fail safe function: If trouble occurs in this relay circuit, the ECU cuts off current to the ABS and TRAC solenoid relays and prohibits ABS and TRAC control. WIRING DIAGRAM R TRAC Solenoid Relay (R/B No. 5) ABS & TRAC ECU 12 V 1 6 B-R 18 B-R 1 TSR IB6 A20 ABS 2 R/B No.1 4 V-Y 13 V-Y 12 R– IB6 A2 No.2 ALT 3 5 TRAC OFF Indicator Light Monitor B W-B 3 1 V 11 V 2 SMC R-W IB2 A13 Battery 4 2V-Y 10 V-Y 8 SRC IB2 A22 –EA TRAC Actuator A07059