cover SUBARU LEGACY 1995 Service Repair Manual

OBD0292
Z: DTC P0335
—CRANKSHAFT POSITION SENSOR
CIRCUIT MALFUNCTION (CRANK)—
OBD0293A
DESCRIPTION:

The crankshaft position sensor is installed on the oil
pump, located in the front center portion of the cylinder
block, to detect the crankshaft position. It is designed so
that the ECM accurately reads the number of pulses which
occur when protrusions provided at the perimeter of the
crankshaft sprocket (rotating together with the crankshaft)
cross the crankshaft position sensor.

The crankshaft position sensor is a molded type which
consists of a magnet, core, coil, terminals, etc.

1Terminal

2Yoke core

3Magnet

4Coil

5Core

6Cover
OBD0294A

The crankshaft sprocket is provided with six protrusions.
Crankshaft rotation causes these protrusions to cross the
crankshaft position sensor so that magnetic fluxes in the
coil change with the change in air gap between the sensor
pick-up and the sprocket. The change in air gap induces an
electromotive force which is transmitted to the ECM.
221
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

C: ON-BOARD DIAGNOSTICS
* : Blinks every 0.125 (1/8) seconds (until ignition switch is turned OFF).
** : Blinks every 0.25 (1/4) seconds (until ignition switch is turned OFF).
*** : Plug in diagnosis terminal to diagnosis connector No. 5 located below instrument lower cover.
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
6. Diagnostic Chart for On-board Diagnostic System

B4M0585A
4) Measure resistance between A.B.S. control module
connector and body.
TROUBLE CODE / Connector & terminal:
21 / (P3) No. 23—body
23 / (P3) No. 22—body
25 / (P3) No. 24—body
27 / (P3) No. 8—body
Specified resistance: 1 MΩ, min.
B4M0586A
5) Turn ignition switch ON.
6) Measure voltage between A.B.S. control module con-
nector and body.
TROUBLE CODE / Connector & terminal:
21 / (P3) No. 23—body
23 / (P3) No. 22—body
25 / (P3) No. 24—body
27 / (P3) No. 8—body
Specified voltage: 0 V
G4M0698
2. CHECK INPUT SIGNAL OF A.B.S. SENSOR TO
A.B.S. CONTROL MODULE SIDE.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Disconnect connector from A.B.S. control module.
4) Disconnect connector cover from connector.
(a) Remove screw from portion
1.
(b) Move rubber boot
2back (toward harness).
(c) Slide cover
3in direction shown by arrow and
remove.
5) Connect connector to A.B.S. control module.
6) Connect the oscilloscope to the A.B.S. control module
connector in accordance with trouble code.
7) Turn ignition switch ON.
19
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B4M0711A
1. CHECK INPUT SIGNAL OF A.B.S. SENSOR TO
A.B.S. CONTROL MODULE SIDE.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Disconnect connector from A.B.S. control module.
4) Disconnect connector cover from connector. 4-4a [T7C2].>
5) Connect connector to A.B.S. control module.
6) Connect the oscilloscope to the A.B.S. control module
connector in accordance with the trouble code.
7) Turn ignition switch ON.
8) Rotate wheels and measure voltage at specified fre-
quency.
NOTE:
When this inspection is completed, the A.B.S. control mod-
ule sometimes memorizes the trouble code 29.
TROUBLE CODE / Connector & terminal:
22 / (P3) No. 23 (+)—No. 21 ()
24 / (P3) No. 22 (+)—No.4()
26 / (P3) No. 24 (+)—No. 26 ()
28 / (P3) No. 8 (+)—No.9()
Specified voltage: 0.12—1 V (When it is 20 Hz.)
B4M0248B
2. CHECK RESISTANCE OF A.B.S. SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. sensor.
3) Measure resistance between A.B.S. sensor connector
terminals.
TROUBLE CODE / Connector & terminal:
22 / (B6) No. 1—No. 2
24 / (B15) No. 1—No. 2
26 / (P8) No. 1—No. 2
28 / (P9) No. 1—No. 2
Specified resistance: 0.8—1.2 kΩ
24
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B4M0711A
1. CHECK INPUT SIGNAL OF A.B.S. SENSOR TO
A.B.S. CONTROL MODULE SIDE.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Disconnect connector from A.B.S. control module.
4) Disconnect connector cover from connector. 4-4a [T7C2].>
5) Connect connector to A.B.S. control module.
6) Connect the oscilloscope to the A.B.S. control module
connector in accordance with the trouble code.
7) Turn ignition switch ON.
8) Rotate wheels and measure voltage at specified fre-
quency.
NOTE:
When this inspection is completed, the A.B.S. control mod-
ule sometimes memorizes the trouble code 29.
Connector & terminal:
(P3) No. 23 (+)—No. 21 ()
(P3) No. 22 (+)—No.4()
(P3) No. 24 (+)—No. 26 ()
(P3) No. 8 (+)—No.9()
Specified voltage: 0.12—1 V (When it is 20 Hz.)
B4M0248B
2. CHECK RESISTANCE OF A.B.S. SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. sensor.
3) Measure resistance between A.B.S. sensor connector
terminals.
Connector & terminal:
(B6) No. 1—No. 2
(B15) No. 1—No. 2
(P8) No. 1—No. 2
(P9) No. 1—No. 2
Specified resistance: 0.8—1.2 kΩ
28
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B4M0596
B4M0261B
1. CHECK INPUT VOLTAGE OF A.B.S. CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Disconnect connector cover from connector. 4-4a [T7C2].>
4) Connect connector to A.B.S. control module.
5) Turn ignition switch ON.
6) Measure input voltage between A.B.S. control module
connector and body.
Connector & terminal / Specified voltage:
(P3) No. 32—Body / 10—12 V
35
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B4M0267B
2. CHECK OUTPUT VOLTAGE TO A.B.S. CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Disconnect connector cover from connector. 4-4a [T7C2].>
4) Connect connector to A.B.S. control module.
5) Turn ignition switch ON.
6) Measure voltage between A.B.S. control module con-
nector terminals.
Connector & terminal / Specified voltage:
(P3) No. 17—No. 20 / 10—12 V
B4M0268B
3. CHECK INPUT VOLTAGE OF A.B.S. CONTROL
MODULE.
1) Turn ignition switch ON.
2) Measure voltage between A.B.S. control module con-
nector terminals.
Connector & terminal / Specified voltage:
(P3) No. 32—No. 20 / 10—12 V
B4M0269B
4. CHECK HARNESS CONNECTOR BETWEEN A.B.S.
CONTROL MODULE AND HYDRAULIC CONTROL
UNIT.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module and
hydraulic control unit.
3) Measure resistance between A.B.S. control module and
hydraulic control unit.
Connector & terminal / Specified resistance:
(P3) No. 17—(F9) No.6/0Ω
(P3) No. 32—(F9) No. 11 / 0Ω
(P3) No. 27—(F9) No. 12 / 0Ω
39
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B4M0267B
2. CHECK OUTPUT VOLTAGE OF A.B.S. CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Disconnect connector cover from connector. 4-4a [T7C2].>
4) Connect connector to A.B.S. control module.
5) Turn ignition switch ON.
6) Measure voltage between A.B.S. control module con-
nector terminals.
Connector & terminal / Specified voltage:
(P3) No. 17—No. 20 / 10—12 V
B4M0275B
3. CHECK HARNESS CONNECTOR BETWEEN A.B.S.
CONTROL MODULE AND HYDRAULIC CONTROL
UNIT.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Disconnect connector from hydraulic control unit.
4) Measure resistance between A.B.S. control module
connector and hydraulic control unit connector.
Connector & terminal / Specified resistance:
(P3) No. 17—(F9) No.6/0Ω
(P3) No. 28—(F9) No.5/0Ω
(P3) No. 14—(F9) No.7/0Ω
B4M0276B
4. CHECK POWER SUPPLY CIRCUIT OF HYDRAULIC
CONTROL UNIT.
1) Turn ignition switch OFF.
2) Disconnect connector from hydraulic control unit.
3) Measure voltage between hydraulic control unit connec-
tor and body.
Connector & terminal / Specified voltage:
(F8) No. 2—Body / 10—12 V
43
4-4aBRAKES
7. Diagnostics Chart with Trouble Code

B5M0115B
B: ON-BOARD DIAGNOSTIC
When the airbag system is in functioning condition, the
airbag warning light will remain on for 8 seconds and go out
when the ignition switch is set to ON.
If there is any malfunction, the airbag warning light will
either stay on or off continuously. In such cases, perform
on-board diagnostic in accordance with the specified pro-
cedure to determine trouble codes.
1) Turn ignition switch ON (with engine OFF).
2) Connect DIAG. terminal

1to No. 1 terminal of diagno-
sis connector

2located below lower cover.
3) Check in accordance with the trouble code indicated by
the AIRBAG warning light, and record the trouble codes.
4) Turn the ignition switch “OFF” and remove the DIAG.
terminal from No.1 terminal of diagnosis connector.
B5M0116B
C: CLEAR MEMORY
After eliminating problem as per trouble code, clear
memory as follows:
Make sure ignition switch is ON (and engine off). Connect
one DIAG. terminal

1on diagnosis connector
2terminal
No. 1.
While warning light is flashing, connect the other DIAG.
terminal

3on terminal No. 2 for at least three seconds.
After memory is cleared, normal warning light flashing rate
resumes. (Warning light flashes every 0.6 seconds ON-
OFF operation.) Memory cannot be cleared if any problem
exists.
After clear memory and then DIAG. terminals

1and
3,
extract from diagnosis connector

2.
9
5-5SUPPLEMENTAL RESTRAINT SYSTEM
4. Diagnostics Chart for On-board Diagnostic System

E: DIAGNOSTICS PROCEDURE
Airbag warning light stays on after 8 seconds.
1) Perform on-board diagnostic.
2) Are trouble codes 2, 4, 12, 13, 22, 23, 24 or 32 indicated?
Record trouble codes.
3) If“NO”, proceed with diagnostics and repair according to trouble code indicated then perform step 29).
4) If“YES”, proceed by turning ignition switch“OFF”, disconnect battery ground cable, and wait 20 seconds. If codes 12 or 13 are
indicated proceed to step 5). If codes 12 or 13 are not indicated proceed to step 6).
5) Remove driver side airbag module and connect test harness C
connector (1C) to (AB7).
Connect airbag resistor to test harness C connector (3C). Pro-
ceed to step 19).
G5M0430
6) If codes 4 or 22 are indicated, proceed to step 7). If codes 4 or 22 are not indicated proceed to step 11).
7) Turn ignition switch“OFF”, disconnect battery ground cable,
and wait 20 seconds. Disconnect passenger side airbag mod-
ule connector (AB9) to (AB10). Connect
test harness C connector (1C) to (AB9).
Connect airbag resistor to test harness C connector (3C).
B5M0118A
8) Reconnect battery ground cable and turn ignition switch“ON”, does airbag warning light go out after 8 seconds and remain“OFF”
for more than 30 seconds? See notes 1) and 2). (Refer to end of chart.)
9) If“YES”, turn ignition switch“OFF”, disconnect battery ground cable, and wait 20 seconds. Install a new passenger side airbag
module then proceed to step 29).
10) If“NO”proceed to step 1).
11) Remove lower cover panel and connect test harness C con-
nector (1C) to (AB8) with airbag resis-
tor attached to test harness C connector (3C).
Turn ignition switch“ON”. Does airbag warning light go“OFF”
after 8 seconds and remain off for more than 30 seconds?
See notes 1) and 2). (Refer to end of chart.)
If“YES”proceed to step 5).
If“NO”proceed to step 12).
G5M0429
12
5-5SUPPLEMENTAL RESTRAINT SYSTEM
4. Diagnostics Chart for On-board Diagnostic System