Subaru Legacy 2004 Service Manual page 622

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 12 (+) — Chassis ground (
2 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between brake switch
connectors.
Connector & terminal
(B137) No. 12 (+) — Chassis ground (
3 CHECK BRAKE SWITCH.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM and
chassis ground with brake pedal depressed.
Terminal
(B65) No. 1 — (B65) No. 4:
4 CHECK BRAKE SWITCH.
Measure the resistance between brake switch
connectors with brake pedal depressed.
Terminal
(B65) No. 1 — (B65) No. 4:
Check
Is the voltage more than 10 V? Go to step 2.
"
):
Is the voltage more than 10 V? Repair the battery
"
):
Is the resistance less than 1
&?
Is the resistance more than 1
M&?
EN(H4SO 2.0)(diag)-190
Yes
Go to step 3.
Go to step 3.
short circuit
between ECM and
brake switch.
Go to step 4. Replace the brake
switch. <Ref. to
CC-6, Stop Light
and Brake
Switch.>
Check the poor Replace the brake
contact in ECM switch. <Ref. to
connector. CC-6, Stop Light
and Brake
Switch.>
No