codes SUBARU LEGACY 1995 Service User Guide

3. READ DATA LIST

MODE $01
—Current powertrain diagnostic data—
Refers to data denoting the current operating condition of
analog input/output, digital input/output and/or the power-
train system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
01 Number of emission-related powertrain trouble codes and MIL status ON/OFF
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
0E Ignition timing advance°
10 Air flow rate from mass air flow sensor g/sec
11 Throttle valve opening angle%
13 Check whether oxygen sensor is installed.—
14 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 1 V and %
15 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 2 V and %
1C On-board diagnosis system—
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access generic OBD-II PIDs (MODE $01).
29
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

MODE $02
—Powertrain freeze frame data—
Refers to data denoting the operating condition when
trouble is sensed by the on-board diagnosis system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
02 Trouble code that caused CARB required freeze frame data storage—
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access freeze frame data (MODE $02).

MODE $03
—Emission-related powertrain diagnostic
trouble codes—
Refers to data denoting emission-related powertrain diag-
nostic trouble codes.
For details concerning diagnostic trouble codes, refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST [T11A0].
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access emission-related powertrain diag-
nostic trouble codes (MODE $03).
30
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

OBD0060
5) Turn ignition switch ON (engine OFF) and Subaru
select monitor switch ON.
OBD0064
6) Using Subaru select monitor, call up diagnostic trouble
code(s) and various data, then record them.

READ DIAGNOSTIC TROUBLE CODE (DTC) SHOWN
ON DISPLAY. (MODE FB1)
(1) Press the function key [0].
G3M0152
(2) Designate mode using function key.
Press [F] [B] [1] [ENT] in that order.
OBD0062
(3) Ensure diagnostic trouble code(s) is shown.

When there is only one diagnostic trouble code.
OBD0063

When there are multiple diagnostic trouble codes.
NOTE:
For details concerning diagnostic trouble codes, refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST [T11A0].
33
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

8) Using the OBD-II general scan tool, check for diagnos-
tic trouble code(s) and record the result(s).
NOTE:

For detailed operation procedures, refer to the OBD-II
General Scan Tool Instruction Manual.

For details concerning diagnostic trouble codes, refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST [T11A0].
OBD0064
4. CHECK FOR DIAGNOSTICS TROUBLE CODE
Using Subaru select monitor, check for diagnostic trouble
code(s) and record the result(s).

READ DIAGNOSTIC TROUBLE CODE (DTC) SHOWN
ON DISPLAY. (MODE FB0 <INSPECTION MODE>)
(1) Press the function key [0].
G3M0152
(2) Designate mode using function key.
Press [F] [B] [0] [ENT] in that order.
OBD0086
(3) Ensure diagnostic trouble code(s) is shown.

When there is only one diagnostic trouble code.
OBD0087

When there are multiple diagnostic trouble codes.
NOTE:
For details concerning diagnostic trouble code(s), refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST [T11A0].
63
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

2. HOW TO READ TROUBLE CODE OF INDICATOR
LIGHT
The AT OIL TEMP indicator light flashes the code corre-
sponding to the faulty part.
The long segment (1.2 sec on) indicates a“ten”, and the
short segment (0.2 sec on) signifies a“one”.
B3M0193A
E: CLEAR MEMORY
Current trouble codes shown on the display are cleared by
turning the ignition switch OFF after conducting on-board
diagnostic operation. Previous trouble codes, however,
cannot be cleared since they are stored in the TCM
memory which is operating on the back-up power supply.
These trouble codes can be cleared by removing the speci-
fied fuse (located under the right lower portion of the instru-
ment panel).
CLEAR MEMORY:
Removal of No. 14 fuse (for at least one minute)

The No. 14 fuse is located in the line to the memory
back-up power supply of the TCM and ABS/TCS control
module. Removal of this fuse clears the previous trouble
codes stored in the TCM and ABS/TCS control module
memory.

Be sure to remove the No. 14 fuse for at least the speci-
fied length of time. Otherwise, trouble codes may not be
cleared.
14
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
6. Diagnostic Chart for On-board Diagnostic System

8. Diagnostic Chart with Select Monitor
A: BASIC DIAGNOSTIC CHART
If no trouble codes appear in the on-board diagnostic
operation (although problems have occurred or are
occurring), measure performance characteristics of
sensors, actuators, etc., in the“F”mode (select monitor
function), and compare with the“basic data”to determine
the cause of problems.
Trouble occurs.
No trouble codes appear in on-board diagnostic operation.
Measure each item in select mode function.
Compare measured values with basic data.
Determine item which is outside basic data specifications.
Check sensor and actuator affected.





55
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
8. Diagnostic Chart with Select Monitor

B: INSPECTION MODE
The on-board diagnosis system is designed to detect prob-
lems after the vehicle has been driven at 10 km/h (6 MPH)
or more for at least 20 seconds. If a problem is found, the
A.B.S. warning light will illuminate to inform the driver of the
occurrence of a problem. When the warning light is on, the
A.B.S. system will be inactive and the normal braking func-
tion will work. It is possible for a maximum of three trouble
codes to be stored in memory until cleared.
B4M0082A
C: TROUBLE CODES
When on-board diagnosis of the A.B.S. control module
detects a problem, the information (up to a maximum of
three) will be stored in the EEP ROM as a trouble code.
When there are more than three, the most recent three will
be stored. (Stored codes will stay in memory until they are
cleared.)
1. CALLING UP A TROUBLE CODE
1) Take out diagnosis connector from side of driver’s seat
heater unit.
2) Turn ignition switch OFF.
3) Connect diagnosis connector terminal 6 (terminal L) to
diagnosis terminal.
4) Turn ignition switch ON.
5) A.B.S. warning light is set in the diagnostic mode and
blinks to identify trouble code.
6) After the start code (11) is shown, the trouble codes will
be shown in order of the last information first.
These repeat for a maximum of 5 minutes.
NOTE:
When there are no trouble codes in memory, only the start
code (11) is shown.
B4M0232A
8
4-4aBRAKES
6. Diagnostics Chart for On-board Diagnosis System

C: TROUBLE CODE 21, 23, 25 AND 27
—FAULTY A.B.S. SENSOR (OPEN CIRCUIT
OR INPUT VOLTAGE EXCESSIVE)—
DIAGNOSIS:

Faulty A.B.S. sensor

Faulty harness

Faulty A.B.S. control module
TROUBLE SYMPTOM:

A.B.S. does not operate.
NOTE:
Trouble codes 21, 23, 25, and 27 will not be stored while
vehicle is stationary and can’t specify problem location.
Drive vehicle first, perform diagnosis and read trouble
code.
1. Check resistance of A.B.S. sensor to
A.B.S. control module side.
OK
Not OK
4. Check resistance of A.B.S. sensor.
Not OK OK
Replace A.B.S. sensor.
Repair harness/connector.
2. Check input signal of A.B.S. sensor to
A.B.S. control module side.
Not OK
OK
Replace A.B.S. control module.
3. Check A.B.S. sensor mechanical trouble.
OK
Not OK
Repair mechanical trouble.
Replace A.B.S. sensor.
NOTE:
When checking A.B.S. sensor, carefully bend or swing con-
nector and harness to check for improper contacts or open
circuits.





17
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

6. Diagnostics Chart for On-board
Diagnosis System
A: BASIC DIAGNOSTICS PROCEDURE
TROUBLE OCCURS.
Ask the customer when and how the
trouble occurred using interview
check list. <Ref. to 4-4b [T6B0].>
PRE-INSPECTION
<Ref. to 4-4b [T200].>
INSPECTION MODE
<Ref. to 4-4b [T6C0].>
CALLING UP A TROUBLE CODE.
<Ref. to 4-4b [T6D1].>No trouble code is readable.

Inspection using Diagnostic Chart for
Warning Light Failure.
<Ref. to 4-4b [T700].>
Record all trouble codes.
Trouble codes
are issued.
Only the start code is issued.
Inspection using General Diagnostics
Chart
<Ref. to 4-4b [T1100].>
Perform diagnostics in accordance with trouble code.
<Ref. to 4-4b [T8A0].>
Trouble code
designated.

Repair.
Clear memory.
<Ref. to 4-4b [T6D2].>
INSPECTION MODE
<Ref. to 4-4b [T6C0].>
CALLING UP A TROUBLE CODE.
<Ref. to 4-4b [T6D1].>
Only the start code is issued.
CONFIRMATION TEST
END
NOTE:

To check harness for broken wires or short circuits,
shake it while holding it or the connector.

When TCS warning light illuminates, read and record
trouble code indicated by TCS warning light.












13
4-4bBRAKES
6. Diagnostics Chart for On-board Diagnosis System

C: INSPECTION MODE
The on-board diagnosis system is designed to detect prob-
lems while the vehicle is being driven. If a problem is found,
the ABS and TCS warning light will illuminate to inform the
driver of the occurrence of a problem. When the warning
light is on, the ABS/TCS system will be inactive and the
normal braking function will work. It is possible for the most
recent trouble code and history of problem to be stored in
memory until cleared.
B4M0082C
D: TROUBLE CODES
When on-board diagnosis of the ABS/TCS control module
detects a problem, the information will be stored in the EEP
ROM as a trouble code. (Stored codes will stay in memory
until they are cleared.)
1. CALLING UP A TROUBLE CODE
1) Take out diagnosis connector from side of driver’s seat
heater unit.
2) Turn ignition switch OFF.
3) Connect diagnosis connector terminal No. 4 to diagno-
sis terminal.
4) Turn ignition switch ON.
5) TCS warning light is set in the diagnostic mode and
blinks to identify trouble code.
6) After the start code (11) is shown, the trouble codes will
be shown in order of the last information first.
NOTE:
When there are no trouble codes in memory, only the start
code (11) is shown.
B4M0383A
16
4-4bBRAKES
6. Diagnostics Chart for On-board Diagnosis System