Subaru FORESTER 2001 Service Manual page 107

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (Diagnostics)
No.
5 CHECK HARNESS BETWEEN ECM AND
MASS AIR FLOW SENSOR CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM and mass air flow sensor connector.
Connector & terminal
(B84) No. 13 — (B3) No. 3:
(B135) No. 27 — (B3) No. 4:
(B135) No. 19 — (B3) No. 5:
6 CHECK HARNESS BETWEEN ECM AND
MASS AIR FLOW SENSOR CONNECTOR
Measure resistance of harness between ECM
and chassis ground.
Connector & terminal
(B84) No. 13 — Chassis ground:
(B135) No. 27 — Chassis ground:
(B135) No. 19 — Chassis ground:
7 CHECK POOR CONTACT
Check poor contact in mass air flow sensor
connector.
Step
Is the resistance less than
1Ω?
Is the resistance more than
1MΩ?
Is there poor contact in
mass air flow sensor con-
nector?
EN(DOHC TURBO)-106
Check Yes
Go to step 6.
Go to step 7.
Repair poor con-
tact in mass air
flow sensor con-
nector.
No
Repair open cir-
cuit between ECM
and mass air flow
sensor connector.
Repair ground
short circuit
between ECM
and mass air flow
sensor connector.
Replace mass air
flow and intake air
temperature sen-
sor. <Ref. to
FU(DOHC
TURBO)-34, Mass
Air Flow and
Intake Air Tem-
perature Sensor.>