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Subaru Legacy III (2000-2003 year). Manual - part 997

CC-8

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

CRUISE CONTROL MODULE I/O SIGNAL

4. Cruise Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

Content

Terminal No.

Measuring conditions and I/O signals (ignition switch ON and engine idling)

Main light

• Battery voltage is present when main switch is turned OFF.
• “0” volt is present when main switch is turned ON.

Inhibitor switch (AT)

• Battery voltage is present when selector lever is other than “P” or “N” position.
• “0” volt is present when selector lever is set to “P” or “N” position.

Motor B

• ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while
cruise control is operating.
• “0” volt is present when main switch is turned OFF.

Ground

—

Motor A

• ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while
cruise control is operating.
• “0” volt is present when main switch is turned OFF.

RESUME/ACCEL switch

• Battery voltage is present when command switch is turned to RESUME/ACCEL
position.
• “0” volt is present when command switch is released.

SET/COAST switch

• Battery voltage is present when command switch is turned to SET/COAST
position.
• “0” volt is present when command switch is released.

Main power supply

• Battery voltage is present when main switch is turned ON.
• “0” volt is present when main switch is turned OFF.

Ignition switch

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

Motor C

• ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while
cruise control is operating.
• “0” volt is present when main switch is turned OFF.

Motor clutch

• ON-and-OFF (“0”-and-battery voltage) operation is alternately repeated while
cruise control is operating.
• “0” volt is present when vehicle is stopped.

Cruise control main switch

• Battery voltage is present during pressing the main switch.
• “0” volt is present when main switch is released.

Brake switch

Leave clutch pedal released (MT), while cruise control main switch is turned ON.
Then check that;
• Battery voltage is present when brake pedal is released.
• “0” volt is present when brake pedal is depressed.
Additionally only in MT vehicle, keep the cruise control main switch to ON and
leave brake pedal released.
Then check that;
• Battery voltage is present when clutch pedal is released.
• “0” volt is present when clutch pedal is depressed.

Data link connector

—

Data link connector

—

CC-00075

20 19 18 17 16 15 14 13 12 11

CC-9

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

CRUISE CONTROL MODULE I/O SIGNAL

B: SCHEMATIC

<Ref. to WI-142, SCHEMATIC, Cruise Control System.>

Vehicle speed sensor (MT)
TCM (AT)

Lift-up the vehicle until all four wheels are raised off ground, and then rotate any
wheel manually.
Approx. “5” and “0” volt pulse signals are alternately input to cruise control mod-
ule.

Stop light switch

Turn 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.

Content

Terminal No.

Measuring conditions and I/O signals (ignition switch ON and engine idling)

CC-10

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

SUBARU SELECT MONITOR

5. Subaru Select Monitor

A: OPERATION

1. GENERAL

The on-board diagnosis function of the cruise con-
trol system uses an external Subaru Select Moni-
tor.
The on-board diagnosis function operates in two
categories, which are used depending on the type
of problems;
1) Cruise cancel conditions diagnosis

(1) This category of diagnosis requires actual
vehicle driving in order to determine the cause,
(as when cruise speed is cancelled during driv-
ing although cruise cancel condition is not en-
tered).
(2) Cruise control module memory stores the
cancel condition (Code No.) which occurred dur-
ing driving. When there are plural cancel condi-
tions (Code No.), they are shown on the Subaru
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 igni-
tion switch or cruise main switch is turned OFF.
2) Real-time diagnosis
The real-time diagnosis function is used to deter-
mine whether or not the input signal system is in
good order, according to signal emitted from
switches, sensors, etc.

(1) Vehicle cannot be driven at cruise speed be-
cause problem occurs in the cruise control sys-
tem or its associated circuits.
(2) Monitor the signal conditions from switches
and sensors.

2. CRUISE CANCEL CONDITIONS DIAG-
NOSIS

1) Prepare Subaru Select Monitor kit.

2) Connect diagnosis cable to Subaru Select Mon-
itor.
3) Insert cartridge into Subaru Select Monitor.
<Ref. to CC-5, SPECIAL TOOLS, PREPARATION
TOOL, General Description.>

4) Connect Subaru Select Monitor to data link con-
nector.

(1) Data link connector (A) is located in the low-
er portion of the instrument panel (on the driver's
side).

(2) Connect diagnosis cable to data link con-
nector.

5) Start engine and turn cruise control main switch
to ON.

CC-00028

CC-00029

CC-00076

( A )

CC-11

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

SUBARU SELECT MONITOR

6) Turn Subaru Select Monitor switch (A) to ON.

7) On the «Main Menu» display screen, select the
{All System Diagnosis} and press the [YES] key.

NOTE:
The diagnostic trouble code (DTC) is also shown in
the {Each System Check} mode. This mode is
called up on the «Cruise Control Diagnosis» dis-
play screen by selecting the item {Cancel Code(s)
Display}.
8) Drive vehicle at least 30 km/h (19 MPH) with
cruise speed set.
9) If cruise speed is canceled itself (without doing
any cancel operations), a diagnostic trouble code
(DTC) will appear on select monitor display.

CAUTION:
• A diagnostic trouble code (DTC) will also ap-
pear when cruise cancel is effected by driver.
Do not confuse.
• Have a co-worker ride in vehicle to assist in
diagnosis during driving.

NOTE:
Diagnostic trouble code (DTC) will be cleared by
turning ignition switch or cruise control main switch
to OFF.

3. REAL-TIME DIAGNOSIS

1) Connect select monitor.
2) Turn ignition switch and cruise control main
switch to ON.
3) Turn Subaru Select Monitor switch to ON.
4) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
5) On the «System Selection Menu» display
screen, select the {Cruise Control} and press the
[YES] key.
6) Press the [YES] key after displayed the informa-
tion of engine type.
7) On the «Cruise Control Diagnosis» display
screen, select the {Current Data Display & Save}
and press the [YES] key.
8) Make sure that normal indication is displayed
when controls are operated as indicated below:
• Depress/release the brake pedal. (Stop light
switch and brake switch turn ON or OFF.)
• Turn ON/OFF the “SET/COAST” switch.
• Turn ON/OFF the “RESUME/ACCEL” switch.
• Depress/release the clutch pedal. (MT)
• Set the selector lever to P or N. (AT)

NOTE:
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
• For detailed concerning diagnostic trouble codes
(DTCs), refer to the List of Diagnostic Trouble Code
(DTC).
<Ref. to CC-26, List of Diagnostic Trouble Code
(DTC).>

CC-00077

( A )

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