Subaru LEGACY 2006 Manual page 142

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 CHECK HARNESS BETWEEN ECM AND
MASS AIR FLOW SENSOR CONNECTOR.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B135) No. 26 — Chassis ground:
(B135) No. 34 — Chassis ground:
(B135) No. 30 — Chassis ground:
7 CHECK POOR CONTACT.
Check poor contact of mass air flow sensor
connector.
Check
Is the resistance more than 1
MΩ?
Is there poor contact in mass
air flow sensor connector?
EN(H4SO)(diag)-105
ENGINE (DIAGNOSTICS)
Yes No
Go to step 7. Repair the ground
short circuit
between ECM and
mass air flow sen-
sor connector.
Repair the poor Replace the mass
contact of mass air air flow and intake
flow sensor con- air temperature
nector. sensor. <Ref. to
FU(H4SO)-25,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>