Subaru 2004 LEGACY, Service Manual

Page: 229 / 609

ABS(diag)-13
ABS (DIAGNOSTICS)
Control Module I/O Signal
*1: Measure the I/O signal voltage after removing the connector from the ABSCM&H/U terminal.
Description
Terminal
No.
(+) — (
−
)
Input/Output signal
Measured value and measuring conditions
ABS wheel speed sen-
sor
(Wheel speed sensor)
Front LH wheel
Power
supply
16 — 15 4.5 — 16.5 V
Signal 1 5.9 — 16.8 mA: Rectangle waveform
Front RH wheel
Power
supply
5 — 15 4.5 — 16.5 V
Signal 6 5.9 — 16.8 mA: Rectangle waveform
Rear LH wheel
Power
supply
2 — 15 4.5 — 16.5 V
Signal 17 5.9 — 16.8 mA: Rectangle waveform
Rear RH wheel
Power
supply
3 — 15 4.5 — 16.5 V
Signal 4 5.9 — 16.8 mA: Rectangle waveform
CAN communication line (+) 26 2.5 — 1.5 V pulse signal
CAN communication line (
−
) 11 3.5 — 2.5 V pulse signal
Valve relay power supply *1 14 — 15 10 — 15 V
Motor relay power supply *1 13 — 15 10 — 15 V
G sensor
Power supply 24 — 10 4.75 — 5.25 V
Ground 10 —
Output 21 — 10 2.1 — 2.5 V when the vehicle is on a level surface
Stop light switch *1 20 — 15
Less than 1.5 V when the stop light is OFF; otherwise,
10 — 15 V when the stop light is ON.
ABS warning light 22 — 15
After turning the ignition switch to ON, 10 — 15 V during
1.5 seconds and less than 1.5 V after 1.5 seconds
passed.
Brake warning light (EBD warning light) 8 — 15
After turning the ignition switch to ON, 10 — 15 V during
1.5 seconds and less than 1.5 V after 1.5 seconds
passed.
Subaru Select Monitor 7 — 15
Less than 1.5 V when no data is received.
0
←→
12 V pulse (in communication)
ABS diagnosis connector 25 — 15 When the ignition switch is ON, 10 — 15 V.
Power supply *1 18 — 15 When the ignition switch is ON, 10 — 15 V.
Grounding line 15 —
Vehicle speed output signal 23 — 15 0
←→
5 V pulse