Subaru IMPREZA GD 2007 Series Manual page 1652

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
15 CHECK REAR OXYGEN SENSOR DATA.
1) Warm-up the engine until engine coolant
temperature is higher than 75°C (167°F), and
keep the engine speed at 3,000 rpm. (2 minutes
maximum)
2) Read the data of rear oxygen sensor signal
using Subaru Select Monitor or general scan tool.
NOTE:
• Depress the clutch pedal for MT models.
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
16 CHECK REAR OXYGEN SENSOR DATA.
1) Warm-up the engine until engine coolant
temperature is higher than 75°C (167°F), and
rapidly reduce the engine speed from 3,000 rpm.
2) Read the data of rear oxygen sensor signal
using Subaru Select Monitor or general scan tool.
NOTE:
• Depress the clutch pedal for MT models.
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
17 CHECK REAR OXYGEN SENSOR CONNEC-
TOR AND COUPLING CONNECTOR.
18 CHECK FRONT OXYGEN (A/F) SENSOR
AND REAR OXYGEN SENSOR DATA.
1) Warm-up the engine until engine coolant
temperature is higher than 75°C (167°F), then
keep the engine idling for 5 minutes or more.
2) Read the data of rear oxygen sensor signal
using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
19 CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
rear oxygen sensor.
3) Measure the resistance of harness between
ECM and rear oxygen sensor connector.
Connector & terminal
(B135) No. 4 — (T6) No. 3:
(B135) No. 30 — (T6) No. 4:
Check
Is the voltage 490 mV or more? Go to step 16.
Is the voltage 250 mV or less? Go to step 18.
Has water entered the connec-
tor?
Is a voltage of 0.8 V or more
maintained for 5 minutes or
more?
Is the resistance less than 1 Ω? Go to step 20.
EN(STI)(diag)-321
ENGINE (DIAGNOSTICS)
Yes No
Go to step 17.
Go to step 17.
Completely Go to step 19.
remove any water
inside.
Replace the front Go to step 19.
oxygen (A/F) sen-
sor. <Ref. to
FU(H4DOTC)-46,
Front Oxygen (A/F)
Sensor.>
Repair the open
circuit of harness
between ECM and
rear oxygen sensor
connector.