sensor SUBARU LEGACY 1996 Service Repair Manual

2. AIRBAG CONNECTOR VIBRATION INSPECTION
Conduct vibration inspection on airbag connectors (AB2)
through (AB8).
: Do the connectors (AB2) through (AB8) mal-
function again when shaking?
: Replace faulty airbag component parts.
: Go to step3.
NOTE:
Gently shake each airbag connector.
G5M0461
3. SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag components.
: Does water leak into the passenger com-
partment when showering vehicle?
: Replace faulty airbag component parts.
: Go to step4.
NOTE:
If leaks are noted, also check wiring harnesses as water
may leak along them and wet airbag connectors.
4. FUSE No. 16, AIRBAG MAIN HARNESS, AIRBAG
CONTROL MODULE, BODY HARNESS APPEARANCE
INSPECTION
Conduct appearance inspection on fuse No. 16 5-5b [T5H3].>, airbag main harness [W4A0].>, airbag control module
and body harness.
: Is there anything unusual about the appear-
ance of fuse No. 16, airbag main harness,
airbag control module or body harness?
: Replace faulty airbag component parts.
: Go to step5.
NOTE:
Also check connectors, terminals, wiring harness and case
for damage.
42
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

5. FUSE No. 16, AIRBAG MAIN HARNESS, BODY
HARNESS VIBRATION INSPECTION
Conduct vibration inspection on fuse No. 16, airbag main
harness and body harness.
CAUTION:
Do not shake or vibrate airbag control module.
: Do fuse No. 16, airbag main harness or
body harness malfunction again when shak-
ing?
: Replace faulty airbag component parts.
: Go to step6.
NOTE:
Gently shake each part.
G5M0461
6. SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on each part.
: Does water leak into the passenger com-
partment when showering vehicle?
: Replace faulty airbag component parts.
: Go to step7.
NOTE:
If leaks are noted, check wiring harnesses as water may
leak along them and get parts wet.
7. WARNING LIGHT ILLUMINATION CHECK
Turn ignition switch“ON”(engine off) and observe airbag
warning light.
: Does the airbag warning light comes on for
8 seconds, then go out and stay out?
: Clear memory.
: Go to 5-5b [T4E0]“DIAGNOSTICS PROCE-
DURE”.
43
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

5. Control Module I/O Signal
G6M0015
ContentTerminal
No.Measuring conditions and I/O signals (ignition switch ON and engine idling)
Main power supply 2
Battery voltage is present when main power is turned ON.

“0”volt is present when main power is turned OFF.
Inhibitor switch (AT) (U.S.A.)
N position switch (AT) (CANADA)4
“0”volt is present when selector lever is set to P or N position (CANADA: N position only).

Battery voltage is present when selector lever is other than P or N position (CANADA: N
position only).
Air valve 5
“0”volt is present when vehicle is stopped.

ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while cruise control
is operating.
GND 6—
Vacuum pump motor 7
“0”volt is present when vehicle is stopped.

ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while cruise control
is operating.
Data link connector 8—
RESUME/ACCEL switch 9
Battery voltage is present when switch is turned ON.

“0”volt is present when switch is turned OFF.
SET/COAST switch 10
Battery voltage is present when switch is turned ON.

“0”volt is present when switch is turned OFF.
Ignition switch 12
Battery voltage is present when ignition switch is turned ON.

“0”volt is present when ignition switch is turned OFF.
Release valve 13
“0”volt is present when vehicle is stopped.

ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while cruise control
is operating.
Power supply to vacuum pump
motor, air valve, release valve14
“0”volt is present when vehicle is stopped.

Battery voltage is present while cruise control is operating.
Cruise main switch 15
Battery voltage is present during pressing the main switch, and then approx. 12 V is
present while switch is turned ON.

“0”volt is present when switch is turned OFF.
Brake switch 16Turn the cruise main switch to ON and leave clutch pedal released (MT).
Then check that;

“0”volt is present when brake pedal is depressed.

Battery voltage is present when brake pedal is released.
Additionally only in MT vehicle, keep the cruise main switch to ON and leave brake pedal
released.
Then check that;

“0”volt is present when clutch pedal is depressed.

Battery voltage is present when clutch pedal is released.
Data link connector 17—
Data link connector 18—
Vehicle speed sensor 2 19Lift-up the vehicle until all four wheels are raised off ground, and then rotate any wheel manu-
ally.
Approx. 5 and 0 volt pulse signals are alternately input to cruise control module.
Stop light switch 20Turn ignition switch to OFF.
Then check that;

Battery voltage is present when brake pedal is depressed.

“0”volt is present when brake pedal is released.
NOTE:
Voltage at terminals 5, 7, 13 and 14 cannot be checked unless vehicle is driving by cruise control operation.
7
6-2BODY ELECTRICAL SYSTEM
5. Control Module I/O Signal

B: ON-BOARD DIAGNOSIS WITH SELECT
MONITOR
1. GENERAL
The on-board diagnosis function of the cruise control sys-
tem uses an external select monitor.
The on-board diagnosis function operates in two
categories, which are used depending on the type of prob-
lems;

Cruise cancel conditions diagnosis

Real-time diagnosis
Applicable cartridge No.: 498349601

Cruise cancel conditions diagnosis
This category of diagnosis requires actual vehicle driv-
ing in order to determine the cause, (as when cruise
speed is cancelled during driving although cruise cancel
condition is not entered).
Cruise control module memory stores the cancel condi-
tion (Code No.) which occurred during driving. When
there are plural cancel conditions (Code No.), they are
shown in order, for 2 seconds per Code No., on the
select monitor.
CAUTION:

The cruise control memory stores not only the
cruise“cancel”which occurred (although“cancel”
operation is not entered by the driver), but also the
“cancel”condition input by the driver.

The content of memory is cleared when ignition
switch or cruise main switch is turned OFF.

Real-time diagnosis
The real-time diagnosis function is used to determine
whether or not the input of output signal system is in good
order, according to signal emitted from switches, sensors,
etc.
Vehicle cannot be driven at cruise speed because prob-
lems occurs in the cruise control system or its associ-
ated circuits.
Monitor the signal conditions from switches and sen-
sors.
9
6-2BODY ELECTRICAL SYSTEM
6. Diagnostics Chart for On-board Diagnosis System

8. Diagnostics Chart with Trouble Code
A: TROUBLE CODE
Trouble code Item Contents of diagnosis Page
10 OK Normal 18
11 BRAKE/ST/CL or N
Input signals from brake switch“OFF”, stop light
switch“ON”(Brake pedal is in depressed condi-
tion.)

Input signals from clutch switch“OFF”, or inhibi-
tor switch is in“N”position.
[Clutch pedal is depressed (MT), or select lever
is set to N position (AT).]20
12 NOT SET SP Out of cruise speed range 22
13 LOW SP LIM Low-speed control limiter 22
14 CANCEL SW Input signal from cancel switch 26
15 NO MEMORY No memorized cruise speed—
21 SP SENS NG Faulty vehicle speed sensor 2 22
22 COM SW NGFaulty SET/COAST switch or RESUME/ACCEL
switch26
23 RELAY NG Faulty safety relay included in cruise control module 29
24 CPU RAM NG Faulty CPU RAM included in cruise control module 29
31 MOTOR NG Faulty vacuum motor or motor drive system 30
32 AIR VAL NG Faulty air valve or valve drive system 30
33 REL VAL NG Faulty release valve or valve drive system 30
16
6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

B6M0191
D: TROUBLE CODE 12, 13 AND 21
—VEHICLE SPEED SENSOR 2 SYSTEM—
DIAGNOSIS:

Disconnection or short circuit of vehicle speed sensor 2
system.
TROUBLE SYMPTOM:

Cruise control cannot be set. (Cancelled immediately.)
1. Check operation of speedometer.
OK
Not OK
Check combination meter circuit.

2. Check input signal for cruise control module.
Not OK
OK

Check for disconnection of the cruise control
module connector terminal.

Failure of the cruise control module.
3. Perform a circuit test between combination
meter and cruise control module.
OK
Not OK
Repair or replace harness connector.
4. Check vehicle speed sensor 2.
OK
Not OK

Mechanical trouble between vehicle speed sensor
2 and speedometer shaft in transmission.

Failure of the vehicle speed sensor 2.
,Replace vehicle speed sensor 2.
Failure in combination meter circuit.




22
6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

B6M0248B
5) Measure resistance of harness connector between
cruise control module and body to make sure that circuit
does not short.
Connector & terminal / Specified resistance:
(B94) No. 19—Body / 1 MΩ, min.
B3M0289
4. CHECK VEHICLE SPEED SENSOR 2.
1) Disconnect connector from vehicle speed sensor 2.
2) Measure resistance between terminals of vehicle speed
sensor 2.
Terminals / Specified resistance:
No. 1—No. 2 / 350—450Ω
B3M0256
WARNING:
Be careful not to be caught up by the running wheels.
3) Set the vehicle on free roller, or lift-up the vehicle and
support with safety stands.
4) Drive the vehicle at speed greater than 20 km/h (12
MPH).
5) Measure voltage between terminals of vehicle speed
sensor 2.
Terminals / Specified voltage:
No. 1—No. 2 / 2 V, or more (AC range)
B3M0257

Using an oscilloscope:
(1) Turn ignition switch to OFF.
(2) Set oscilloscope to vehicle speed sensor 2.
(3) Drive the vehicle at speed greater than 20 km/h (12
MPH).
(4) Measure signal voltage.
Specified voltage (V): 5 V, min.
B3M0254A
25
6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

B6M0243
B: MODE F00
—ROM ID NUMBER (YEAR)—
CONDITION:
Ignition switch“ON”
SPECIFIED DATA:
Presentation display

Probable cause (Item outside“specified data”)
1. Error 1
Check for loose or disconnected connector, and
discontinued circuit, etc.
2. Error 2Check for poor contact of cartridge, or different type
cartridge.
G6M0174
C: MODE F01 AND F02
—VEHICLE SPEED SIGNAL (VSP)—
CONDITION:
Driving at constant speed.
SPECIFIED DATA:
Compare speedometer with monitor indications.

F01: Vehicle speed is indicated in mile per hour (MPH).

F02: Vehicle speed is indicated in kilometer per hour
(km/h).

Probable cause (Item outside“specified data”)
1. Vehicle speed sensor 2
Check vehicle speed sensor line.

32
6-2BODY ELECTRICAL SYSTEM
9. Diagnostics Chart with Select Monitor

G6M0213
5) Some connectors are provided with a lock. One type of
such a connector is disconnected by pushing the lock, and
the other, by moving the lock up. In either type the lock
shape must be identified before attempting to disconnect
the connector.
To connect, insert the connector until it snaps and confirm
that it is tightly connected.
G6M0214
6) When checking continuity between connector terminals,
or measuring voltage across the terminal and ground,
always contact tester probe(s) on terminals from the wiring
connection side. If the probe is too thick to gain access to
the terminal, use“mini”test leads.
To check water-proof connectors (which are not accessible
from the wiring side), contact test probes on the terminal
side being careful not to bend or damage the terminals.
7) Sensors, relays, electrical unit, etc., are sensitive to
strong impacts.
Handle them with care so that they are not dropped or
mishandled.
12
6-3WIRING DIAGRAM
3. Working Precautions

7. Electrical Unit Location
Electrical unit Refer to;
A.B.S. control module 4-4a [T300]
A.B.S. G sensor (MT) 4-4a [T300]
A/C compressor relay
7
A/C fuse11
A/C main fan relay 110
A/C main fan relay 28
A/C pressure switch2
A/C sub fan relay 29
ATF temperature sensor 2-7 [T2B1]
Blower motor resistor
26
Blower relay13
Camshaft position sensor 2-7 [T2A2]
Check connector
25
Clutch switch (MT) 6-2 [T300]
Crankshaft position sensor 2-7 [T2A2]
Cruise control module 6-2 [T300]
Cruise control pump 6-2 [T300]
Data link connector (for OBD-II G.S.T.) 2-7 [T2A1]
Data link connector (for S.S.M.) 2-7 [T2A1]
Diagnosis connector 4-4a [T300]
Diagnosis terminal (Ground) 4-4a [T300]
Door lock timer
27
Engine control module 2-7 [T2A1]
Engine coolant temperature sensor 2-7 [T2A2]
Engine hood switch (Security) 6-2 [K6A0]
Evaporator thermoswitch
29
F/B15
FRESH/RECIRC actuator28
Fuel pump relay 2-7 [T2A3]
Fuel gauge module
31
Fuel gauge sub module (AWD)32
FWD switch (AT)1
Headlight alarm relay (Security) 6-2 [K6A0]
Headlight relay LH
5
Headlight relay RH6
Horn relay14
Electrical unit Refer to;
Hydraulic unit (A.B.S.) 4-4a [T300]
Ignition coil 2-7 [T2A3]
Ignitor 2-7 [T2A3]
Idle air control solenoid valve 2-7 [T2A3]
Illumination control module
21
Inhibitor switch 6-2 [T300]
Knock sensor 2-7 [T2A2]
Main fan relay
19
Main relay 2-7 [T2A3]
Mass air flow sensor 2-7 [T2A2]
Mode actuator
12
M/B4
Oil pressure switch3
Oxygen sensor 2-7 [T2A2]
Pedal stroke sensor (T.C.S.) 4-4b [T300]
Power window and sunroof relay
24
Power window circuit breaker23
Purge control solenoid valve 2-7 [T2A3]
Rear defogger relay
17
Seat belt timer20
Security control module 6-2 [K6A0]
Shift lock control module
22
Starter interrupt relay (Security) 6-2 [K6A0]
Stop & brake switch (With cruise con-
trol)6-2 [T300]
Sunroof control module
30
Tail and illumination relay18
T.C.S. control module 4-4b [T300]
T.C.S. motor relay 4-4b [T300]
T.C.S. valve relay 4-4b [T300]
Throttle position sensor 2-7 [T2A2]
Test mode connector 2-7 [T2A1]
Transmission control module 2-7 [T2B1]
Turn & hazard module
16
Vehicle speed sensor 1 2-7 [T2B1]
Vehicle speed sensor 2 2-7 [T2B1]
107
6-3WIRING DIAGRAM
7. Electrical Unit Location