CHECK AT ASTC-ECU TERMINAL


TERMINAL VOLTAGE CHECK CHART
1.Measure the voltages between earth terminal (4), (22), (56) or (64) and each respective terminal.
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 to the "ON" position. The ASTC-ECU performs the initial check during that period.
Terminal No.
 Check item
 Checking requirements
 Normal condition
1
 Control solenoid valve OUT (RR)
 Ignition switch: ON
 System voltage
2
 Control solenoid valve IN (RR)
 Ignition switch: ON
 System voltage
3
 Control solenoid valve OUT (FL)
 Ignition switch: ON
 System voltage
5
 Booster valve
 Ignition switch: ON
 System voltage
6
 Cut-off valve
 Ignition switch: ON
 System voltage
7
 Switch solenoid valve (FR)
 Ignition switch: ON
 System voltage
8
 Switch solenoid valve (FL)
 Ignition switch: ON
 System voltage
10
 Control solenoid valve IN (FL)
 Ignition switch: ON
 System voltage
19
 Input to stop lamp switch
 Ignition switch: ON
 Stop lamp switch: ON
 System voltage
Stop lamp switch: OFF
 2 V or less
24
 Power supply of ASTC-ECU
 Ignition switch: ON
 System voltage
Ignition switch: START
 0 V
42
 Control solenoid valve IN (FR)
 Ignition switch: ON
 System voltage
43
 Control solenoid valve OUT (FR)
 Ignition switch: ON
 System voltage
44
 Control solenoid valve IN (RL)
 Ignition switch: ON
 System voltage
45
 Control solenoid valve OUT (RL)
 Ignition switch: ON
 System voltage
50
 Pressure sensor power supply
 Ignition switch: ON
 Approximately 5 V
55
 Valve relay monitor
 Ignition switch: ON
 System voltage
59
 Pressure sensor
 Ignition switch: ON
 Approximately 0.14 - 4.85 V
62
 ABS warning lamp output
 Ignition switch: ON
 With lamp OFF
 System voltage
With lamp ON
 2 V or less
74
 Active stability control system indicator/active traction control system indicator output
 Ignition switch: ON
 With active stability control switch OFF
 System voltage
With active stability control switch ON
 2 V or less
75
 2WD/4WD switch input
 Ignition switch: ON
 Transfer lever position: 2H, 4H
 System voltage
Transfer lever position: 4HLc, 4LLc
 2 V or less
76
 4LLc switch input
 Ignition switch: ON
 Transfer lever position: 4LLc
 System voltage
Transfer lever position: 2H, 4H, 4LLc
 2 V or less
80
 Centre differential lock switch input
 Ignition switch: ON
 Transfer lever position: 2H, 4H
 System voltage
Transfer lever position: 4HLc, 4LLc
 2 V or less
81
 Brake warning lamp output
 Ignition switch: ON
 With lamp OFF
 2 V or less
With lamp ON
 System voltage
86
 2WD switch input
 Ignition switch: ON
 Transfer lever position: 2H
 System voltage
Transfer lever position: 4H, 4HLc, 4LLc
 2 V or less
87
 4H switch input
 Ignition switch: ON
 Transfer lever position: 2H, 4LLc
 System voltage
Transfer lever position: 4H, 4HLc
 2 V or less

RESISTANCE AND CONTINUITY BETWEEN HARNESS-SIDE CONNECTOR TERMINALS
1.Turn the ignition switch to the "LOCK" (OFF) position.
2.Resistance measurement and continuity inspection must be performed with ASTC-ECU connector disconnected.
3.Resistance measurement and continuity inspection is performed between the terminals shown in the following table.
4.Individual terminals are arranged as shown in the figure:
Terminal No.
 Signal
 Normal condition
30 - 31
 Wheel speed sensor (FL)
 1.0 - 1.5 kΩ
60 - 61
 Wheel speed sensor (RR)
46 - 47
 Wheel speed sensor (RL)
27 - 28
 Wheel speed sensor (FR)
4 - body earth
 Earth
 Continuity exists (2 Ω or less)
22 - body earth
 Earth
56 - body earth
 Earth
64 - body earth
 Earth