Subaru IMPREZA GD 2007 Series Manual page 3067

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
MANUAL TRANSMISSION AND DIFFERENTIAL (DIAGNOSTICS)
Step
1 CHECK REAR DIFFERENTIAL OIL TEMPER-
ATURE SWITCH WARNING LIGHT CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the driver's control center differ-
ential control module harness connector.
3) Turn the ignition switch to ON. (engine OFF)
4) Measure the voltage of the rear differential
oil temperature switch.
Connector & terminal
(B380) No. 14 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN DRIVER'S
CONTROL CENTER DIFFERENTIAL CON-
TROL MODULE AND COMBINATION
METER.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from the
combination meter.
3) Disconnect the connector from the rear dif-
ferential oil temperature switch.
4) Measure resistance of the driver's control
center differential control module harness con-
nector and the combination meter.
Connector & terminal
(B380) No. 14 — (i10) No. 4:
3 CHECK HARNESS BETWEEN DRIVER'S
CONTROL CENTER DIFFERENTIAL CON-
TROL MODULE AND REAR DIFFERENTIAL
OIL TEMPERATURE SWITCH.
Measure resistance between the driver's con-
trol center differential control module harness
connector and rear differential oil temperature
switch harness connectors.
Connector & terminal
(B380) No. 14 — (R148) No. 1:
4 CHECK REAR DIFFERENTIAL OIL TEMPER-
ATURE SWITCH GROUND CIRCUIT.
1) Disconnect the harness connector from the
bracket ground of the rear differential.
2) Measure the resistance between the rear
differential oil temperature switch ground har-
ness connector and chassis ground.
Connector & terminal
(R159) No. 1 — Chassis ground:
5 CHECK REAR DIFFERENTIAL OIL TEMPER-
ATURE SWITCH.
Measure the resistance between the rear differ-
ential oil temperature switch and the rear differ-
ential oil temperature switch body.
Terminals
No. 1 — Rear differential oil temperature
switch body:
6 CHECK REAR DIFFERENTIAL OIL TEMPER-
ATURE WARNING LIGHT.
1) Turn the ignition switch to ON.
2) Short the chassis ground and the combina-
tion meter harness connector.
Connector & terminal
(i10) No. 4 (+) — Chassis ground (–):
Check
Is the voltage less than 0.4 V? Repair the poor
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance less than 1 Ω? Go to step 4.
Is the resistance 1 MΩ or
more?
Is the resistance less than 1 Ω? Go to step 6.
Does the rear differential oil
temperature light turn OFF?
6MT(diag)-32
Yes No
Go to step 2.
contact.
Repair the open
circuit between the
driver's control
center differential
control module and
the combination
meter.
Repair the open
circuit between the
driver's control
center differential
control module and
the rear differential
oil temperature
switch.
Repair the open Go to step 5.
circuit of the rear
differential oil tem-
perature ground
circuit, and contact
failure of the har-
ness connector.
Replace the rear
differential oil tem-
perature switch.
Repair the poor Check the combi-
contact. nation meter.