Subaru Impreza 2003 Service Manual page 2354

ABS (DIAGNOSTICS)
Contents
Front left wheel
ABS wheel speed sen-
Front right wheel
sor*2
Rear left wheel
(Wheel speed sensor)
Rear right wheel
Valve relay power supply*1
Motor relay power supply*1
Power supply
G sensor*2 Ground
Output
Power supply
Lateral G sensor
Ground
(STi model)
Output
Stop light switch*1
ABS warning light*2
Brake warning light*2
(EBD warning light)
AT ABS signal
(AT models only)
ABS operation signal monitor
Data is received.
Subaru Select Moni-
tor*2
Data is sent.
Terminal No. 3
ABS diagnosis connec-
tor
Terminal No. 6
Power supply*1
Grounding line
Grounding line
*1: Measure the I/O signal voltage after removing the connector from the ABSCM&H/U terminal.
*2: Measure the I/O signal voltage at connector (F2).
CONTROL MODULE I/O SIGNAL
Terminal No.
(+) — (−)
9 — 10
11 — 12
7 — 8
14 — 15
24 — 23
25 — 23
30 — 28
28
6 — 28
30 — 28
28
29 — 28
2 — 23
22 — 23
21 — 23
31 — 23
3 — 23
20 — 23
5 — 23
29 — 23
4 — 23
1 — 23
23
26
ABS-14
Input/Output signal
Measured value and measuring conditions
0.12 — 1 V
(When it is 20 Hz.)
10 — 15 V
10 — 15 V
4.75 — 5.25 V
2.1 — 2.5 V when vehicle is in horizontal position.
4.75 — 5.25 V
2.3 — 2.7 V when vehicle is in horizontal position.
Less than 1.5 V when the stop light is OFF and, 10 — 15 V
when the stop light is ON.
Less than 1.5 V within 1.5 seconds immediately after ignition
switch has been turned to ON, and 10 — 15 V after 1.5 sec-
onds has elapsed.
Less than 1.5 V within 1.5 seconds immediately after ignition
switch has been turned to ON, and 10 — 15 V after 1.5 sec-
onds has elapsed.
Less than 1.5 V when the ABS control still operates and more
than 5.5 V when ABS does not operate.
Less than 1.5 V when the ABS control still operates and more
than 5.5 V when ABS does not operate.
Less than 1.5 V when no data is received.
4.75 — 5.25 V when no data is sent.
10 — 15 V when ignition switch is ON.
10 — 15 V when ignition switch is ON.
10 — 15 V when ignition switch is ON.
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