Page 1457 of 2248

OBD0680A
3
CHECK HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connectors from purge control solenoid
valve and ECM.
3) Measure resistance between purge control solenoid
valve connector and body.
: Connector & terminal
(E4) No. 2—Body / 10Ω, or less
: Repair short circuit of harness between ECM con-
nector and purge control solenoid valve connec-
tor.
: Go to the next step.
4) Measure resistance between ECM and purge control
solenoid valve of harness connector.
OBD0681A
: Connector & terminal
(B84) No. 59—(E4) No. 2 / 10Ω, or less
: Go to step 4.
: Repair open circuit of harness between ECM con-
nector and purge control solenoid valve connec-
tor.
OBD0338
4
CHECK PURGE CONTROL SOLENOID VALVE.
1) Remove purge control solenoid valve.
2) Measure resistance between purge control solenoid
valve terminals.
: Terminals
No. 1—No. 2 / 10—100Ω
: Go to step 5.
: Replace purge control solenoid valve.
251
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1458 of 2248
OBD0339A
5CHECK POWER SUPPLY TO PURGE CON-
TROL SOLENOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between purge control solenoid valve
connector and body.
: Connector & terminal
(E4) No. 1—Body / 10 V, or more
: Confirm good connection at purge control sole-
noid valve connector.
: Repair open circuit of harness between main relay
connector and purge control solenoid valve con-
nector.
252
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1459 of 2248

OBD0340
AG: DTC P0500
—VEHICLE SPEED SENSOR MALFUNCTION
(VSP)—
DESCRIPTION:
The speedometer system is an electric type; it uses no
speedometer cable and drives the speedometer according
to electric pick-up sensor (vehicle speed sensor 2).
The speed sensor 2 is installed on the transmission. The
speed sensor 2 sends the vehicle speed signal (8 pulses
per one turn of speed sensor driven shaft) to the speed
detection circuit in the speedometer where this signal pulse
wave is regulated.
The regulated pulse signal (4 pulses per one turn of speed
sensor driven shaft) is sent to the speedometer drive cir-
cuit and odometer (trip meter) drive circuit.
The output signal from vehicle speed detection circuit is
also used in ECM, TCM, etc.
B6H0022A
B6H0021A
The speed sensor 2 consists of a magnetic resistance
element, magnet ring, driven shaft, spring, etc.
As the driven key rotates, the magnet turns to change the
magnetic field of the coil.
The coil generates power corresponding to a change in the
magnetic field.
One turn of the driven key in the vehicle speed sensor 2
sends 8 pulses of AC signal to the combination meter.
DTC DETECTING CONDITION:
Immediately at fault recognition
253
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1460 of 2248
1.Check speedometer operation in combination
meter.
2.Check harness.
3.Check harness.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
OBD0343
254
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1461 of 2248
![SUBARU LEGACY 1995 Service Repair Manual 1CHECK SPEEDOMETER OPERATION IN COM-
BINATION METER.
: Check normal operation of speedometer.
: Check speedometer and vehicle speed sensor
<Ref. to 6-2 [K3A0].>.
: Go to step 2.
OBD0349A
2
CHECK HARNE SUBARU LEGACY 1995 Service Repair Manual 1CHECK SPEEDOMETER OPERATION IN COM-
BINATION METER.
: Check normal operation of speedometer.
: Check speedometer and vehicle speed sensor
<Ref. to 6-2 [K3A0].>.
: Go to step 2.
OBD0349A
2
CHECK HARNE](/manual-img/17/57432/w960_57432-1460.png)
1CHECK SPEEDOMETER OPERATION IN COM-
BINATION METER.
: Check normal operation of speedometer.
: Check speedometer and vehicle speed sensor
.
: Go to step 2.
OBD0349A
2
CHECK HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 57—Body / 2 V, or more
: Check the following and repair if necessary.
Open circuit of harness between ECM connector and
combination meter connector
Poor contact in ECM connector
Poor contact in combination meter connector
Poor contact in coupling connector (B37)
: Go to step 3.
OBD0351A
3
CHECK HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM connec-
tor and body.
: Connector & terminal
(B84) No. 57—Body / 10Ω, or less
: Repair short circuit of harness between ECM con-
nector and combination meter connector.
: Repair poor contact in ECM connector.
255
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1462 of 2248
OBD0358
OBD0688A
AH: DTC P0505
—IDLE CONTROL SYSTEM MALFUNCTION
(ISC)—
DESCRIPTION:
Idle air control solenoid valve consists of an air cut valve,
duty control valve, intake air passage and a coolant pas-
sage.
Air cut valve contains a bimetallic substance which
responds to coolant temperature, and a duty control valve
which is operated by a signal sent from ECM.
When engine coolant temperature is low, air cut valve is
fully opened by the action of the bimetallic substance so
that the air flow required for low engine coolant tempera-
tures is maintained.
ECM controls duty control valve to bring the operating
engine speed as close to preset idle speed as possible.
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling
Engine stalls.
Engine breathing
256
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1463 of 2248
1.Check air intake system.
2.Check output signal from ECM.
3.Check idle air control solenoid valve.
4.Check power supply to idle air control
solenoid valve.
5.Check harness connector between ECM and
idle air control solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
LHD model
OBD0360
257
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1464 of 2248
WIRING DIAGRAM:
RHD model
B2M0457
258
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code