CHECK AT ABS-ECU TERMINAL <Vehicles without ASTC>


TERMINAL VOLTAGE CHECK CHART
1.Measure the voltages between earth terminal (12), (25), (26) or (42) 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 ABS-ECU performs the initial check during that period.
Terminal No.
 Check item
 Checking requirements
 Normal condition
6
 Motor relay 1
 Ignition switch: ON
 Pump motor does not operate.
 System voltage
Pump motor operates.
 2 V or less
13
 Power supply of ABS-ECU
 Ignition switch: ON
 System voltage
Ignition switch: START
 0 V
17
 Pressure switch (low-pressure warning)
 Ignition switch: ON
 Brake fluid pressure: EXTRA LOW
(Buzzer sounds.)
 Approx. 9 V
Brake fluid pressure: NORMAL
(Buzzer does not sound.)
 Approx. 4 V
31
 Power supply of ABS-ECU
 Ignition switch: ON
 System voltage
35
 Pump motor current detection (-)
 Ignition switch: ON
 2 V or less
38
 Motor relay 2
 Ignition switch: ON
 Pump motor does not operate.
 System voltage
Pump motor operates.
 2 V or less
39
 Brake warning light
 Ignition switch: ON
 The warning light does not illuminate.
 2 V or less
The warning light illuminates.
 System voltage
43
 Pressure switch (Pump motor control)
 Ignition switch: ON
 Brake fluid pressure: LOW
(Pump motor operates.)
 Approx. 6 V
Brake fluid pressure: HIGH
(Pump motor does not operate.)
 Less than 2 V
44
 Buzzer
 Ignition switch: ON
 Buzzer does not sound.
 System voltage
Buzzer sounds.
 Less than 2 V
45
 Pump motor current detection (+)
 Ignition switch: ON
 Pump motor does not operate.
 Less than 2 V
Pump motor operates.
 System voltage
49
 Pump motor monitor
 Ignition switch: ON
 Less than 2 V

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 ABS-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
12 - body earth
 Earth
 Continuity exists (2 Ω or less)
25 - body earth
 Earth
26 - body earth
 Earth
42 - body earth
 Earth