CHECK AT ECU TERMINALS


ASTC-ECU

TERMINAL VOLTAGE CHECK
1.Do not disconnect the ASTC-ECU connector, and measure the voltages between earth terminal No.13 or No.38 and each respective terminal.
2.The terminal layout is shown in the illustration.


Terminal No.
 Terminal code
 Check item
 Checking requirements
 Normal condition
1
 +BM
 Motor power supply
 Always
 Battery voltage
2
 IG1
 ASTC-ECU power supply(IG1)
 Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
3
 -
 -
 -
 -
4
 CANL
 CAN bus line
 -
 -
5-8
 -
 -
 -
 -
9
 STP2
 Stop lamp switch monitor
  • Ignition switch: "ON"
  • Stop lamp switch: "OFF"

 1 V or less

  • Ignition switch: "ON"
  • Stop lamp switch: "ON"

 Approximately system voltage
10-15
 -
 -
 -
 -
16
 CANH
 CAN bus line
 -
 -
17-19
 -
 -
 -
 -
20
 FL+
 Wheel speed sensor (FL) power supply
 Ignition switch: "ON"
 Approximately system voltage
21
 FL-
 Wheel speed sensor (FL) signal
 -
 -
22
 RR+
 Wheel speed sensor (RR) power supply
 Ignition switch: "ON"
 Approximately system voltage
23
 RR-
 Wheel speed sensor (RR) signal
 -
 -
24
 -
 -
 -
 -
25
 +BV
 Solenoid valve power supply
 Always
 Battery voltage
26, 27
 -
 -
 -
 -
28
 STP
 Stop lamp monitor
  • Ignition switch: "ON"
  • Stop lamp switch: "OFF"

 1 V or less

  • Ignition switch: "ON"
  • Stop lamp switch: "ON"

 Approximately system voltage
29
 -
 -
 -
 -
30
 SWON
 ASC OFF switch
 ASC OFF switch: "ON"
 1 V or less
ASC OFF switch: "OFF"
 Approximately system voltage
31
 -
 -
 -
 -
32
 FR+
 Wheel speed sensor (FR) power supply
 Ignition switch: "ON"
 Approximately system voltage
33
 FR-
 Wheel speed sensor (FR) signal
 -
 -
34
 RL+
 Wheel speed sensor (RL) power supply
 Ignition switch: "ON"
 Approximately system voltage
35
 RL-
 Wheel speed sensor (RL) signal
 -
 -
36
 -
 -
 -
 -
37
 ASTP
 Stop lamp relay
 Ignition switch: ON
 Approximately system voltage
38
 -
 -
 -
 -

CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR
1.Turn the ignition switch to the LOCK (OFF) position.
2.Disconnect the ASTC-ECU connector.
3.Check the resistance and continuity between the terminals indicated in the table below.
4.The terminal layout is shown in the illustration.


Terminal No.
 Signal
 Normal condition
13 - body earth
 Earth
 Continuity exists (2 Ω or less)
38 - body earth
 Earth
 Continuity exists (2 Ω or less)

STEERING WHEEL SENSOR

TERMINAL VOLTAGE CHECK
1.Do not disconnect the steering wheel sensor connector, and measure the voltages between earth terminal No.5 and each respective terminal.
2.The terminal layout is shown in the illustration.


Terminal No.
 Terminal code
 Check item
 Checking requirements
 Normal condition
1
 -
 -
 -
 -
2
 IG1
 Steering wheel sensor power supply(IG1)
 Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
3
 CANH
 CAN bus line
 -
 -
4
 CANL
 CAN bus line
 -
 -
5
 -
 -
 -
 -

CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR
1.Turn the ignition switch to the LOCK (OFF) position.
2.Disconnect the steering wheel sensor connector.
3.Check the resistance and continuity between the terminals indicated in the table below.
4.The terminal layout is shown in the illustration.


Terminal No.
 Signal
 Normal condition
5 - body earth
 Earth
 Continuity exists (2 Ω or less)