CHECK AT ASTC-ECU

1.Disconnect the ASTC-ECU connector A-48, and measure the voltages between terminal No.12 and each terminal other than terminal No.24 as well as between terminal No.12 and each terminal other than terminal No.24. 2.The terminal layouts are shown in the illustrations below. note Do not measure terminal voltage for approximately three seconds after the ignition switch is turned "ON." The ASTC-ECU performs the initial check during that period. Terminal No. Check item Checking requirements Normal condition 1 Solenoid valve power supply Always Battery voltage 3 ABS warning lamp output Ignition switch: "ON" (When ABS warning lamp is ON.) 1 V or less Ignition switch: "ON" (When ABS warning lamp is OFF.) Approximately system voltage 5 Brake warning lamp output Ignition switch: "ON" (When brake warning lamp is ON.) 1 V or less Ignition switch: "ON" (When the brake warning lamp is OFF, the brake fluid level is normal and the parking brake is "OFF" position.) Approximately system voltage 7 Wheel speed sensor (FR) power supply Ignition switch: "ON" Approximately system voltage 9 Wheel speed sensor (RL) power supply Ignition switch: "ON" Approximately system voltage 10 ASC OFF lamp output Ignition switch: "ON" (When ASC OFF switch is not pushed.) 1 V or less Ignition switch: "ON" (When ASC OFF switch is pushed.) Approximately system voltage 13 Motor power supply Always Battery voltage 19 Wheel speed sensor (FL) power supply Ignition switch: "ON" Approximately system voltage 21 Wheel speed sensor (RR) power supply Ignition switch: "ON" Approximately system voltage 22 ASC warning lamp output Ignition switch: "ON" (When ASC warning lamp is ON.) 1 V or less Ignition switch: "ON" (When ASC warning lamp is OFF.) Approximately system voltage 25 ASTC-ECU power supply Ignition switch: "ON" Battery voltage Ignition switch: "OFF" 1 V or less 26 Stop lamp switch input Ignition switch: "ON" Stop lamp switch: "ON" Approximately system voltage Stop lamp switch: "OFF" 1 V or less 29 ASC switch output Ignition switch: "ON" When the ASC OFF switch is not pushed (Not being operated) Approximately system voltage When the ASC OFF switch is pushed (being operated) 1 V or less 30*1 Rear differential lock detection switch input Rear differential lock detection switch: "OFF" Approximately system voltage Rear differential lock detection switch: "ON" 1 V or less 32*2 Back-up lamp switch input Ignition switch: "ON" Shift lever: Other than reverse position Approximately system voltage Shift lever: Reverse position 1 V or less note *1: Vehicles with rear differential lock *2: Vehicles for M/T only

1.Disconnect the A-48 ASTC-ECU connector. 2.Measure the resistance and continuity between the terminals indicated in the table below. Terminal No. Signal Normal condition 12 to body earth Earth Continuity exists (2 Ω or less) 24 to body earth Earth Continuity exists (2 Ω or less)