display SUBARU LEGACY 1995 Service Owner's Manual

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 )
(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

5. Specified Data
1. ENGINE CONTROL MODULE (ECM) I/O SIGNAL
OBD0092A
ContentConnector
No.Terminal
No.Signal (V)
Note Ignition SW
Engine ON (Idling)
ON (Engine OFF)
Crankshaft
position
sensorSignal (+) B84 8 0 ±7 Sensor output waveform
Signal () B84 7 0 0—
Shield B84 52 0 0—
Camshaft
position
sensorSignal (+) B84 6 0 ±7 Sensor output waveform
Signal () B84 5 0 0—
Shield B84 52 0 0—
Mass air
flow
sensorSignal B84 26 0—0.3 0.8—1.2—
Shield B84 54 0 0—
GND B84 25 0 0—
Throttle
position
sensorSignal B84 24Fully closed: 0.2—1.0
Fully opened: 4.2—4.7—
Power
supplyB84 22 5 5—
GND B84 25 0 0—
Front
oxygen
sensorSignal B84 28 0 0)0.9—
Shield B84 56 0 0—
Rear
oxygen
sensorSignal B84 27 0 0)0.9—
Shield B84 56 0 0—
Engine coolant
temperature sensorB84 29 1.0—1.4 1.0—1.4 After warm-up
Vehicle speed sensor
2B84 57 0or5 0or5“5”and“0”are repeatedly
displayed when vehicle is
driven.
67
2-7ON-BOARD DIAGNOSTICS II SYSTEM
5. Specified Data

7. Basic Diagnostics Procedure
Trouble occurs.
Ask the customer when and how the
trouble occurred using interview
check list.
Start the engine.
Ye sNoInspection using“9. Diagnostics for
Engine Start Failure [T900]”
Malfunction indicator lamp (MIL) illu-
minates.
Ye sNoInspection using“10. General Diag-
nostics Table [T1000]”
Inspection using Subaru select moni-
tor or OBD-II general scan tool.
(Subaru select monitor: MODE FB1)
Trouble code
No trouble code designated.Repair.
See NOTE: *1
designated.
Inspection using“11. Diagnostics
Chart with Trouble Code [T11A0]”.
See NOTE: *2.
Trouble code
designated.

Repair.
Inspection mode
Inspection using Subaru select moni-
tor or OBD-II general scan tool.
(Subaru select monitor: MODE FB0)
No trouble code
Clear memory mode.
designated.
END
NOTE:
*1: If trouble code is not shown on display although the
MIL illuminates, perform diagnostics of the MIL (CHECK
ENGINE LIGHT) circuit or combination meter. Diagnostics for CHECK ENGINE Malfunction Indicator
Lamp (MIL) [T800].”>
*2: Carry out the basic check, only when trouble code
about automatic transmission is shown on display. [T701].>






100
2-7ON-BOARD DIAGNOSTICS II SYSTEM
7. Basic Diagnostics Procedure

1. BASIC CHECK ITEMS FOR AT
When trouble code about automatic transmission is shown
on display, carry out the following basic check. After that,
carry out the replacement or repair work.
1) ATF level check
2) Differential gear oil level check
3) ATF leak check
4) Differential gear oil leak check
5) Brake band adjustment
6) Stall test
7) Line pressure test
8) Transfer clutch pressure test
9) Time lag test
10) Road test
11) Shift characteristics
NOTE:
As for the method, refer to 3-2 [W2A1].
101
2-7ON-BOARD DIAGNOSTICS II SYSTEM
7. Basic Diagnostics Procedure

OBD0145A
B2M0271
OBD0616
1CONNECT SUBARU SELECT MONITOR OR
THE OBD-II GENERAL SCAN TOOL, AND
READ DATA.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch to ON and Subaru Select Monitor or
the OBD-II general scan tool switch to ON.
4) Start engine.
5) Read data on Subaru Select Monitor or OBD-II general
scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F08 or F47

F08: Voltage input from mass air flow sensor is shown
on display.

F47: Mass air flow is shown on display.

F08: Is sensor output equal to or more
than 0.3 V and equal to or less than
5.0 V?

F47: Is sensor output equal to or more
than 1.3 g/sec and equal to or less
than 250 g/sec?
Probable cause: Poor connect of connectors, circuit and
grounding line.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. A temporary poor
contact of the connector or harness may be the
cause. Repair harness or connector of the mass
air flow sensor.
HINT:
1Open or short circuit between mass air flow sen-
sor and ECM.

2Poor contact of connectors for mass air flow sen-
sor or ECM.
: Go to next.
: Is the value less than 0.3 V (1.3 g/sec)?
: Go to step 2.
: Go to step 5.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
138
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1.Check DTC P0100 on display.
No
Ye s

Inspect DTC P0100 using“11. Diagnostics
Chart with Trouble Code [T1100]”.

In this case, it is unnecessary to inspect DTC
P0101.
Replace mass air flow sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0144

142
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1
CHECK TRANSMISSION TYPE.
Refer to the flow chart on page 145.
OBD0145A
OBD0620
OBD0641
2CONNECT SUBARU SELECT MONITOR OR
THE OBD-II GENERAL SCAN TOOL, AND
READ DATA.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch to ON and Subaru Select Monitor or
the OBD-II general scan tool switch to ON.
4) Start engine.
5) Read the data on Subaru Select Monitor or the OBD-II
general scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F24 or F49

F24: Display shows voltage signal value sent from pres-
sure sensor.

F49: Display shows pressure signal value sent from
pressure sensor.
: Less than 0.2 V or 0 kPa
: Go to step 3.
: Go to next.
: More than 4.9 V or 140 kPa
: Go to step 5.
: Repair the harness and connector between pres-
sure sensor and ECM.
HINT:
1Open or short circuit of harness between pres-
sure sensor and ECM.

2Poor contact of pressure sensor connector and
ECM connector.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
147
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0691A
3CHECK INPUT SIGNAL FOR ECM. (USING
VOLTAGE METER AND SUBARU SELECT
MONITOR.)
1) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 22—Body/4.5 V, or more
: Go to next step.
: Go to next.
OBD0158
: Is the voltage more than 4.5 V while shaking
harness and connector of ECM?

Subaru Select Monitor
Designate mode using function key.
Function mode: F23

F23: Display shows voltage signal value sent from pres-
sure sensor.
: Repair poor contact in ECM connector.
: Replace ECM with a new one.
OBD0692A
2) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 23—Body/0.2 V, or less
: Go to next.
: Go to step 4.
OBD0158
: Is the voltage more than 0.2 V while shaking
harness and connector of ECM and monitor-
ing the value with Subaru select monitor?

Subaru Select Monitor
Designate mode using function key.
Function mode: F23

F23: Display shows voltage signal value sent from pres-
sure sensor.
: Repair poor contact in ECM connector.
: Go to step 4.
148
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0170
E: DTC P0106
—PRESSURE SENSOR CIRCUIT
RANGE/PERFORMANCE PROBLEM (P
—R)—
DESCRIPTION:
Refer to“D: DTC P0105—PRESSURE SENSOR CIR-
CUIT MALFUNCTION—[T11D0]”.
DTC DETECTING CONDITION:

Two consecutive trips with fault
1.Check transmission type.
AT
MT
Check AT/MT identification circuit.
2.Check DTC P0105 or P1102 on display.
No
Ye s

Inspect DTC P0105 or P1102 using“11. Diagnostics
Chart with Trouble Code [T1100]”.

In this case, it is unnecessary to inspect DTC
P0106.
3.Check data for control.
4.Check vacuum hose.
5.Check pressure sources of switching solenoid
valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>




151
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD model
B2M0449
1
CHECK TRANSMISSION TYPE.
Refer to the flow chart on page 151.
2
CHECK DTC P0105 OR P1102 ON DISPLAY.
Refer to the flow chart on page 151.
OBD0145A
3
CHECK DATA FOR CONTROL.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch ON and Subaru Select Monitor or
the OBD-II general scan tool switch ON.
4) Start engine.
153
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code