1997 SUBARU LEGACY Service Repair Manual

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Page 3153 of 3342

SUBARU LEGACY 1997 Service Repair Manual 5. Control Module I/O Signal
G6M0015
ContentTerminal
No.Measuring conditions and I/O signals (ignition switch ON and engine idling)
Main power supply 2Battery voltage is present when main power is tu

5. Control Module I/O Signal
G6M0015
ContentTerminal
No.Measuring conditions and I/O signals (ignition switch ON and engine idling)
Main power supply 2Battery 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 9Battery voltage is present when switch is turned ON.
“0”volt is present when switch is turned OFF.
SET/COAST switch 10Battery voltage is present when switch is turned ON.
“0”volt is present when switch is turned OFF.
Ignition switch 12Battery 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 15Battery 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

Page 3154 of 3342

SUBARU LEGACY 1997 Service Repair Manual 6. Diagnostics Chart for On-board
Diagnosis System
A: BASIC DIAGNOSTICS PROCEDURE
Trouble occurs.
Pre-inspection <Ref. to 6-2 [T200].>
Check if cruise control main switch turns ON prop-
erly.
OK
Not

Page 3155 of 3342

SUBARU LEGACY 1997 Service Repair Manual 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
cat

Page 3156 of 3342

SUBARU LEGACY 1997 Service Repair Manual 2. CRUISE CANCEL CONDITIONS DIAGNOSIS
1) Connect select monitor.
2) Start the engine and turn cruise control main switch to
ON.
3) Set select monitor in“FB0”mode.
4) Drive vehicle at least 40 km/h

Page 3157 of 3342

SUBARU LEGACY 1997 Service Repair Manual 7. Diagnostics Chart for Power Line
A: BASIC DIAGNOSTICS PROCEDURE
Drive at cruise speed.
Cruise speed can be set.
(Cruise control is available.)Cruise speed cannot be set.
(Cruise control is not avai

Page 3158 of 3342

SUBARU LEGACY 1997 Service Repair Manual B: CHECK INDICATOR AND CIRCUIT IN
CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:
Bulb failure or open harness of the indicator circuit in the
cruise control main switch.
TROUBLE SYMPTOM:
Cruise control can b

Page 3159 of 3342

SUBARU LEGACY 1997 Service Repair Manual B6M0180
1. CHECK CRUISE CONTROL MAIN SWITCH.
1) Remove cruise control main switch.
2) Measure resistance between cruise control main switch
terminals.
Terminals / Specified resistance:
No. 1—No. 6 /

Page 3160 of 3342

SUBARU LEGACY 1997 Service Repair Manual C: CHECK CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:
Faulty cruise control main switch, or open harness.
TROUBLE SYMPTOM:
Cruise control main switch is not turned ON and cruise
control cannot be set.
NOTE

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