sensor SUBARU LEGACY 1997 Service Repair Manual

B4M0915
8Y9
CHECK G SENSOR.
1) Turn ignition switch to OFF.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Connect connector to ABSCM&H/U.
5) Turn ignition switch to ON.
6) Measure voltage between G sensor connector termi-
nals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 2.1 and 2.4 V when G
sensor is horizontal?
: Go to step8Y10.
: Replace G sensor.
B4M0917A
8Y10
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 3.7 and 4.1 V when G
sensor is inclined forwards to 90°?
: Go to step8Y11.
: Replace G sensor.
B4M0918A
8Y11
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 0.5 and 0.9 V when G
sensor is inclined backwards to 90°?
: Go to step8Y12.
: Replace G sensor.
8Y12CHECK POOR CONTACT IN CONNEC-
TORS.
: Is there poor contact in connector between
ABSCM&H/U and G sensor? WORD [T3C1].>
: Repair connector.
: Go to step8Z12.
76
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

G2M0096
9. Select Monitor Function Mode
Applicable cartridge of select monitor: No. 498346300
A: LIST OF FUNCTION MODE
1. F MODE (ROM ID, ANALOG DATA ARE
DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
F00 ROM ID ECM identificationROM ID number of ECM is read and enabled com-
munication state is displayed.Possible 4-4d [T9B0]
F01 FRFR wheel speed
(mile/h)Wheel speed detected by the FR ABS sensor is
displayed in mile/h.Possible 4-4d [T9C0]
F02 FLFL wheel speed
(mile/h)Wheel speed detected by the FL ABS sensor is dis-
played in mile/h.Possible 4-4d [T9D0]
F03 RRRR wheel speed
(mile/h)Wheel speed detected by the RR ABS sensor is
displayed in mile/h.Possible 4-4d [T9E0]
F04 RLRL wheel speed
(mile/h)Wheel speed detected by the RL ABS sensor is
displayed in mile/h.Possible 4-4d [T9F0]
F05 FRFR wheel speed
(km/h)Wheel speed detected by the FR ABS sensor is
displayed in km/h.Possible 4-4d [T9C0]
F06 FLFL wheel speed
(km/h)Wheel speed detected by the FL ABS sensor is dis-
played in km/h.Possible 4-4d [T9D0]
F07 RRRR wheel speed
(km/h)Wheel speed detected by the RR ABS sensor is
displayed in km/h.Possible 4-4d [T9E0]
F08 RLRL wheel speed
(km/h)Wheel speed detected by the RL ABS sensor is
displayed in km/h.Possible 4-4d [T9F0]
F09 BLSStop light switch
monitorStop light switch monitor voltage is displayed. Possible 4-4d [T9G0]
F10 G-SENSG sensor output volt-
age (V)Refers to vehicle acceleration detecting by the ana-
log G sensor. It appears on the select monitor dis-
play in volts.Possible 4-4d [T9H0]
78
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode

4. FC MODE (TROUBLE CODES ARE ERASED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FC0 D⋅CLRHistory of trouble
codes is erased.Function of clearing trouble code. Possible 4-4d [T9J0]
5. FD MODE (ABS SEQUENCE CONTROL MODE)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FD1 A⋅CHKABS sequence con-
trolPerform ABS sequence control by operating valve
and pump motor sequentially.Impossible4-4
[W20D2]
6. FE MODE (FREEZE FRAME DATA)
NOTE:

Data stored at the time of trouble occurrence is shown
on display.

Each time trouble occurs, the latest information is stored
in the freeze frame data in memory.
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FE1 FRFR wheel speed
(mile/h)Wheel speed detected by the FR ABS sensor is
displayed in mile/h.Possible 4-4d [T9K0]
FE2 FLFL wheel speed
(mile/h)Wheel speed detected by the FL ABS sensor is dis-
played in mile/h.Possible 4-4d [T9L0]
FE3 RRRR wheel speed
(mile/h)Wheel speed detected by the RR ABS sensor is
displayed in mile/h.Possible 4-4d [T9M0]
FE4 RLRL wheel speed
(mile/h)Wheel speed detected by the RL ABS sensor is
displayed in mile/h.Possible 4-4d [T9N0]
FE5 FRFR wheel speed
(km/h)Wheel speed detected by the FR ABS sensor is
displayed in km/h.Possible 4-4d [T9K0]
FE6 FLFL wheel speed
(km/h)Wheel speed detected by the FL ABS sensor is dis-
played in km/h.Possible 4-4d [T9L0]
FE7 RRRR wheel speed
(km/h)Wheel speed detected by the RR ABS sensor is
displayed in km/h.Possible 4-4d [T9M0]
FE8 RLRL wheel speed
(km/h)Wheel speed detected by the RL ABS sensor is
displayed in km/h.Possible 4-4d [T9N0]
FE13 POWERABSCM&H/U power
supply voltage (V)Power (in volts) supplied to ABSCM&H/U appears
on the select monitor display.Possible 4-4d [T9O0]
FE14 G-SENSG sensor output volt-
age (V)Refers to vehicle acceleration detected by the ana-
log G sensor. It appears on the select monitor dis-
play in volts.Possible 4-4d [T9P0]
FE15MM Motor relay monitor LED 1 comes on when motor relay is on.
Possible 4-4d [T9Q0] B1 Stop light switchLED 2 comes on with the stop light switch on (with
the brake pedal depressed).
AT AT ABS signal LED 3 comes on when ABS control is on.
CM CCM signal LED 4 comes on when ABS control is on.
A0 ABS control LED 5 comes on when ABS control is on.
FE16 CODE Trouble codeThe most recent trouble code appears on select
monitor display.Possible 4-4d [T9R0]
80
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode

B4M0925
F: MODE F04 AND F08
—REAR LEFT WHEEL SPEED SIGNAL (RL)
—

Compare speedometer with monitor indications.

F04: RL wheel speed is indicated in mile per hour (mile/
h).

F08: RL wheel speed is indicated in kilometer per hour
(km/h).
NOTE:
The monitor as shown, indicates that RL wheel speed is 50
km/h.
B4M1265
G: MODE F09
—STOP LIGHT SWITCH MONITOR (BLS)—

Stop light switch monitor voltage is displayed.
B4M0927
H: MODE F10
—G SENSOR OUTPUT VOLTAGE (G-SENS)
—

Refers to vehicle acceleration detecting by the analog G
sensor. It appears on the select monitor display in volts.
NOTE:
Only AWD model
84
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode

B4M0939
P: MODE FE14
—G SENSOR OUTPUT VOLTAGE (G-SENS)
—

Refers to vehicle acceleration detected by the analog G
sensor at the time of malfunction. It appears on the select
monitor display in volts.
NOTE:
Only AWD model
LED No. Signal name Display
1 Motor relay monitor MM
2 Stop light switch B1
3 AT ABS signal AT
4 CCM signal CM
5 ABS signal AO
6——
7——
8——
9——
10——
MM B1 AT CM AO
—————
1
2345
678910
Q: MODE FE15
—ON↔OFF SIGNAL—

ON or OFF is indicated at the time of malfunction.

Requirement for LED“ON”
LED No. 1 Motor relay is turned ON.
LED No. 2 Stop light switch is turned ON. (With brake
pedal depressed.)
LED No. 3 ABS control operates.
LED No. 4 ABS control operates.
LED No. 5 ABS control operates.
H4M1151
R: MODE FE16
—TROUBLE CODE (CODE)—

When freeze frame data is stored in memory, trouble
code appears on monitor.
NOTE:
The monitor as shown, indicates trouble code 21.
89
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode

B: LIST OF TROUBLE CODE
Code Display screen (FB1) Contents of diagnosis Ref. to
—ERROR 3 (1) Select monitor communication failure 4-4d [T10C0]
11 NO TROUBLEAlthough no trouble appears on the select monitor display, the ABS
warning light remains on.4-4d [T10D0]
21 FR. SS HARD Open circuit or input voltage too high of FR sensor 4-4d [T10E0]
22 FR. SS SOFT Abnormal ABS sensor signal of FR sensor 4-4d [T10I0]
23 FL. SS HARD Open circuit or input voltage too high of FL sensor 4-4d [T10F0]
24 FL. SS SOFT Abnormal ABS sensor signal of FL sensor 4-4d [T10J0]
25 RR. SS HARD Open circuit or input voltage too high of RR sensor 4-4d [T10G0]
26 RR. SS SOFT Abnormal ABS sensor signal of RR sensor 4-4d [T10K0]
27 RL. SS HARD Open circuit or input voltage too high of RL sensor 4-4d [T10H0]
28 RL. SS SOFT Abnormal ABS sensor signal of RL sensor 4-4d [T10L0]
29 EITHER. SS SOFT Abnormal ABS sensor signal (any one of four) 4-4d [T10M0]
31 FR. EV VALVE Abnormal FR inlet valve 4-4d [T10N0]
32 FR. AV VALVE Abnormal FR outlet valve 4-4d [T10R0]
33 FL. EV VALVE Abnormal FL inlet valve 4-4d [T10O0]
34 FL. AV VALVE Abnormal FL outlet valve 4-4d [T10S0]
35 RR. EV VALVE Abnormal RR inlet valve 4-4d [T10P0]
36 RR. AV VALVE Abnormal RR outlet valve 4-4d [T10T0]
37 RL. EV VALVE Abnormal RL inlet valve 4-4d [T10Q0]
38 RL. AV VALVE Abnormal RL outlet valve 4-4d [T10U0]
41 ECU Abnormal ABSCM&H/U 4-4d [T10V0]
42LOW VOLTAGE Source voltage is low. 4-4d [T10W0]
HIGH VOLTAGE Source voltage is high. 4-4d [T10X0]
44CCM LINE A combination of AT control abnormals (ABS not in control) 4-4d [T10Y0]
CCM OPEN A combination of AT control abnormals (ABS in control) 4-4d [T10Z0]
51V. RELAY Abnormal valve relay 4-4d [T10AA0]
V. RELAY ON Valve relay ON failure 4-4d [T10AB0]
52M. RELAY OPEN Open circuit of motor relay 4-4d [T10AC0]
M. RELAY ON Motor relay ON failure 4-4d [T10AD0]
MOTOR Abnormal motor 4-4d [T10AE0]
54 BLS Abnormal stop light switch 4-4d [T10AF0]
56G SENSOR LINE Open or short circuit of G sensor 4-4d [T10AG0]
G SENSOR +B Battery short of G sensor 4-4d [T10AH0]
G SENSOR H µ Abnormal G sensor high µ output 4-4d [T10AI0]
G SENSOR STICK G sensor output is stuck. 4-4d [T10AJ0]
NOTE:
High µ means high friction coefficient against road sur-
face.
91
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M0945
E: TROUBLE CODE 21 FR. SS HARD
—ABNORMAL FRONT RH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0946
F: TROUBLE CODE 23 FL. SS HARD
—ABNORMAL FRONT LH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0947
G: TROUBLE CODE 25 RR. SS HARD
—ABNORMAL REAR RH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0948
H: TROUBLE CODE 27 RL. SS HARD
—ABNORMAL REAR LH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
99
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

DIAGNOSIS:

Faulty ABS sensor (Broken wire, input voltage too high)

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
WIRING DIAGRAM:
B4M1238
100
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M0922
10H1CHECK OUTPUT OF ABS SENSOR
USING SELECT MONITOR.
Read the ABS sensor output corresponding to the faulty
system in the select monitor function mode.
NOTE:
The select monitor display shows that the front right wheel
is rotating at 30 km/h.
: Does the speed indicated on the display
change in response to the speedometer
reading during acceleration/deceleration
when the steering wheel is in the straight-
ahead position?
: Go to step10H2.
: Go to step10H9.
10H2CHECK INSTALLATION OF ABS SEN-
SOR.
Tightening torque:
32±10 N⋅m (3.3±1.0 kg-m, 24±7 ft-lb)
: Are the ABS sensor installation bolts tight-
ened securely?
: Go to step10H3.
: Tighten ABS sensor installation bolts securely.
10H3CHECK INSTALLATION OF TONE
WHEEL.
Tightening torque:
13±3 N⋅m (1.3±0.3 kg-m, 9±2.2 ft-lb)
: Are the tone wheel installation bolts tight-
ened securely?
: Go to step10H4.
: Tighten tone wheel installation bolts securely.
101
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

G4M0700
10H4
CHECK ABS SENSOR GAP.
Measure tone wheel-to-pole piece gap over entire perim-
eter of the wheel.
: Is the gap within the specifications shown
in the following table?
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
G4M0701
: Go to step10H5.
: Adjust the gap.
NOTE:
Adjust the gap using spacers (Part No. 26755AA000). If
spacers cannot correct the gap, replace worn sensor or
worn tone wheel.
10H5
CHECK HUB RUNOUT.
Measure hub runout.
: Is the runout less than 0.05 mm (0.0020 in)?
: Go to step10H6.
: Repair hub.
10H6CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connectors between
ABSCM&H/U and ABS sensor? FOREWORD [T3C1].>
: Repair connector.
: Go to step10H7.
10H7
CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM&H/U.
: Go to step10H8.
102
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor