1.CHECK CURRENT DATA.
2) Read the data of fuel temperature sensor signal using Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. 
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Is the fuel temperature −40°C (−40°F) ?
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Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector may be the cause.
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2.CHECK POOR CONTACT.
Check for poor contact of ECM connector and fuel temperature sensor connector.
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Is there poor contact of ECM connector or fuel temperature sensor connector?
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Repair the poor contact of ECM connector or fuel temperature sensor connector.
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3.CHECK HARNESS BETWEEN ECM AND FUEL TEMPERATURE SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and fuel temperature sensor.
3) Measure the resistance of harness between ECM connector and fuel temperature sensor connector.
Connector & terminal
(B134) No. 48 — (E122) No. 1:
(B134) No. 68 — (E122) No. 2:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between ECM connector and fuel temperature sensor connector
• Poor contact of coupling connector
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4.CHECK HARNESS BETWEEN ECM AND FUEL TEMPERATURE SENSOR CONNECTOR.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM connector and chassis ground.
Connector & terminal
(B134) No. 48 (+) — Chassis ground (−):
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Is the voltage 5 V or more?
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Repair the short circuit of harness to power supply between ECM connector and fuel temperature sensor connector.
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Replace the fuel pump.
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