Subaru IMPREZA GD 2007 Series Manual page 1570

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK POWER SUPPLY OF VEHICLE
SPEED SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between vehicle speed
sensor connector and chassis ground.
Connector & terminal
(B17) No. 3 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND VE-
HICLE SPEED SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and vehicle speed sensor.
3) Measure the resistance of harness between
the ECM and vehicle speed sensor connector.
Connector & terminal
(B136) No. 13 — (B17) No. 1:
3 CHECK HARNESS BETWEEN ECM AND VE-
HICLE SPEED SENSOR.
Measure the resistance between vehicle speed
sensor connector and chassis ground.
Connector & terminal
(B17) No. 1 — Chassis ground:
4 CHECK HARNESS BETWEEN ECM AND VE-
HICLE SPEED SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between vehicle speed
sensor connector and chassis ground.
Connector & terminal
(B17) No. 1 (+) — Chassis ground (–):
5 CHECK POOR CONTACT.
Check for poor contact of vehicle speed sensor
connector.
Check
Is the voltage 10 V or more?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance 1 MΩ or more? Go to step 4.
Is the voltage 10 V or more?
Is there poor contact of vehicle
speed sensor connector?
EN(STI)(diag)-239
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Repair the open or
ground short circuit
of power supply
circuit.
Repair the open
circuit of harness
between ECM and
vehicle speed sen-
sor.
Repair the ground
short circuit of har-
ness between
ECM and vehicle
speed sensor.
Go to step 5.
Repair the short
circuit to power of
harness between
ECM and vehicle
speed sensor.
Repair the poor Replace the vehi-
contact of vehicle cle speed sensor.
speed sensor con- <Ref. to 6MT-31,
nector. Vehicle Speed
Sensor.>