Subaru Forester 2004 Service Manual page 83

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTIC)
Step
6 CHECK HARNESS BETWEEN ECM AND
MASS AIR FLOW SENSOR CONNECTOR.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 23 — Chassis ground:
(B136) No. 31 — Chassis ground:
(B136) No. 35 — Chassis ground:
7 CHECK POOR CONTACT.
Check poor contact in mass air flow sensor
connector.
Check
Is the resistance more than 1
MΩ?
Is there poor contact in mass
air flow sensor connector?
EN(H4DOTC 2.5)-82
Yes
Go to step 7. Repair ground
short circuit
between ECM and
mass air flow sen-
sor connector.
Repair poor contact Replace the mass
in mass air flow air flow and intake
sensor connector. air temperature
sensor. <Ref. to
FU(H4DOTC 2.5)-
30, Mass Air Flow
and Intake Air
Temperature Sen-
sor.>
No