CHECK AT ECU TERMINALS




TERMINAL VOLTAGE CHECK



1.Operate the lock lever to disconnect the ASC-ECU harness connector as shown in the figure.
2.Disconnect the ASC-ECU connector, and measure the voltages between earth terminal No.13 or No.38 and each respective terminal.
3.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
2-4
-
-
-
-
5
TXEG
Brake hold signal
Engine: Idle operation
Battery voltage
Change vehicle status to auto stop status
1 V or less
6
IG1
ASC-ECU power supply(IG1)
Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
7-9
-
-
-
-
10
CANL
CAN bus line
-
-
11
CANH
CAN bus line
-
-
12
STP
Stop lamp drive detection signal
The stop lamps illuminate.
Battery voltage
13
GND1
Earth
Always
1 V or less
14-24
-
-
-
-
25
+BV
Solenoid valve power supply
Always
Battery voltage
26
FR-
Wheel speed sensor (FR) signal
Drive vehicle
Approximately system voltage
27
FR+
Wheel speed sensor (FR) power supply
Ignition switch: "ON"
Approximately system voltage
28
STDL
Stop lamp drive signal
The ACC or the FCM activates, and the stop lamps illuminate.
1 V or less
29
RL+
Wheel speed sensor (RL) power supply
Ignition switch: "ON"
Approximately system voltage
30
RL-
Wheel speed sensor (RL) signal
Drive vehicle
Approximately system voltage
31, 32
-
-
-
-
33
RR-
Wheel speed sensor (RR) signal
Drive vehicle
Approximately system voltage
34
RR+
Wheel speed sensor (RR) power supply
Ignition switch: "ON"
Approximately system voltage
35
-
-
-
-
36
FL+
Wheel speed sensor (FL) power supply
Ignition switch: "ON"
Approximately system voltage
37
FL-
Wheel speed sensor (FL) signal
Drive vehicle
Approximately system voltage
38
GND2
Earth
Always
1 V or less



CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR



1.Operate the lock lever to disconnect the ASC-ECU harness connector as shown in the figure.
2.Check the resistance and continuity between the terminals indicated in the table below.
3.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)