SUBARU LEGACY 1997 Service Repair Manual

B2M0560A
10AJ1CHECK HARNESS BETWEEN KNOCK
SENSOR AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance between ECM harness connector
and chassis ground.
: Connector & terminal
(B84) No. 3—Chassis ground:
Is the resistance more than 700 kΩ?
: Go to step10AJ2.
: Go to next.
B2M0560A
: Connector & terminal
(B84) No. 3—Chassis ground:
Is the resistance less than 400 kΩ?
: Go to step10AJ3.
: Go to step10AJ4.
B2M1090
10AJ2
CHECK KNOCK SENSOR.
1) Disconnect connector from knock sensor.
2) Measure resistance between knock sensor connector
terminal and engine ground.
: Terminal
No. 2—Engine ground:
Is the resistance more than 700 kΩ?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between knock sensor and ECM
connector

Poor contact in knock sensor connector

Poor contact in coupling connector (B21)
: Is the knock sensor installation bolt tight-
ened securely?
: Replace knock sensor.
: Tighten knock sensor installation bolt securely.
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B2M1090
10AJ3
CHECK KNOCK SENSOR.
1) Disconnect connector from knock sensor.
2) Measure resistance between knock sensor connector
terminal and engine ground.
: Terminal
No. 2—Engine ground:
Is the resistance less than 400 kΩ?
: Replace knock sensor.
: Repair ground short circuit in harness between
knock sensor connector and ECM connector.
NOTE:
The harness between both connectors is shielded. Repair
short circuit of harness together with shield.
B2M0561A
10AJ4
CHECK INPUT SIGNAL FOR ECM.
1) Connect connectors to ECM and knock sensor.
2) Turn ignition switch to ON.
3) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 3 (+)—Chassis ground ():
Is the voltage more than 2 V?
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. (However, the pos-
sibility of poor contact still remains.)
NOTE:
In this case, repair the following:

Poor contact in knock sensor connector

Poor contact in ECM connector

Poor contact in coupling connector (B21)
: Repair poor contact in ECM connector.
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OBD0292
AK: DTC P0335
—CRANKSHAFT POSITION SENSOR
CIRCUIT MALFUNCTION—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
WIRING DIAGRAM:
B2M1294
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

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10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0718A
10AK1CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from crankshaft position sensor.
3) Measure resistance of harness between crankshaft
position sensor connector and engine ground.
: Connector & terminal
(E10) No. 1—Engine ground:
Is the resistance more than 100 kΩ?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between crankshaft position
sensor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
: Go to next.
OBD0718A
: Connector & terminal
(E10) No. 1—Engine ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
crankshaft position sensor and ECM connector.
NOTE:
The harness between both connectors are shielded.
Repair ground short circuit in harness together with shield.
: Go to next.
OBD0719A
: Connector & terminal
(E10) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to step10AK2.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between crankshaft position
sensor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
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10AK2CHECK CRANKSHAFT POSITION SEN-
SOR.
: Is the crankshaft position sensor installa-
tion bolt tightened securely?
: Go to next step 1).
: Tighten crankshaft position sensor installation bolt
securely.
G2M0639
1) Remove crankshaft position sensor.
2) Measure resistance between connector terminals of
crankshaft position sensor.
: Terminals
No. 1—No. 2:
Is the resistance between 1 and 4 kΩ?
: Repair poor contact in crankshaft position sensor
connector.
: Replace crankshaft position sensor.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1091
AL: DTC P0336
—CRANKSHAFT POSITION SENSOR
CIRCUIT RANGE/PERFORMANCE PROBLEM
—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
WIRING DIAGRAM:
B2M1294
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

225
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10AL1
CHECK DTC P0335 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0335?
: Inspect DTC P0335 using“10. Diagnostics Chart
with Trouble Code”.
: Replace crankshaft position sensor.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0304
AM: DTC P0340
—CAMSHAFT POSITION SENSOR CIRCUIT
MALFUNCTION—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
WIRING DIAGRAM:
B2M1055
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

227
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0720A
10AM1CHECK HARNESS BETWEEN CAM-
SHAFT POSITION SENSOR AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from camshaft position sensor.
3) Measure resistance of harness between camshaft posi-
tion sensor connector and engine ground.
: Connector & terminal
(E15) No. 1—Engine ground:
Is the resistance more than 100 kΩ?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between camshaft position sen-
sor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
: Go to next.
OBD0720A
: Connector & terminal
(E15) No. 1—Engine ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
camshaft position sensor connector and ECM
connector.
NOTE:
The harness between both connectors are shielded.
Repair ground short circuit in harness together with shield.
: Go to next.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0721A
: Connector & terminal
(E15) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to step10AM2.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between camshaft position sen-
sor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
10AM2
CHECK CAMSHAFT POSITION SENSOR.
: Is the camshaft position sensor installation
bolt tightened securely?
: Go to next step 1).
: Tighten camshaft position sensor installation bolt
securely.
G2M0639
1) Remove camshaft position sensor.
2) Measure resistance between connector terminals of
camshaft position sensor.
: Terminals
No. 1—No. 2:
Is the resistance between 1 and 4 kΩ?
: Repair poor contact in camshaft position sensor
connector.
: Replace camshaft position sensor.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles