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Home >> Subaru >> 1995 >> Impreza Outback, 2.2 4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Testing (OBD - 1.8L) >> Code 63 - Fuel Tank Pressure Sensor
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Code 63 - Fuel Tank Pressure Sensor

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. Turn ignition switch to OFF. Remove and then replace fuel filler cap. Connect Subaru Select Monitor (SSM) to data link connector. Turn ignition switch and SSM switch ON. Select function mode F18 on SSM to indicate pressure sensor output. If value indicated is less than 2). If value is more than 7.2 kPa, go to step No. 4. If value is between - 7.2-7.2 kPa, repair open in harness between ECM and fuel tank pressure sensor connector, poor contact in ECM connector, poor contact in fuel tank pressure sensor connector or repair contact in any coupling between ECM and fuel tank pressure sensor connector.
  2. Measure voltage between ECM connector E30, terminal No. 3 and ground. If voltage is 4.5 volts or more, go to next step. If voltage changes more than 4.5 volts while shaking harness and connector of ECM, repair contact in ECM connector. If no change while shaking, replace ECM. Measure voltage between ECM connector E31, terminal No.5 and ground. If voltage is 0.2 volt or less, go to step 3). If voltage is more than 0.2 volt, select function mode F18 on SSM to read fuel tank pressure sensor output signal. If SSM reading changes more than - 7.2 kPa while shaking ECM harness and connector, repair poor contact in ECM connector. If no change, go to next step.
  3. Turn ignition switch to OFF. Remove right rear quarter trim inside trunk. Disconnect fuel tank pressure sensor connector. Turn ignition switch to ON. Measure voltage between fuel tank pressure sensor connector R43, and ground. If voltage is less than 4.5 volts, repair open in harness between ECM and fuel tank pressure sensor connector, repair poor contact in ECM connector, repair poor contact in fuel tank pressure sensor connector or repair poor contact in any coupling between ECM and pressure sensor connector. If voltage is more than 4.5 volts, turn ignition switch to OFF and disconnect connector from ECM. Measure resistance between ECM connector E31, terminal No. 5 and pressure sensor connector R43, terminal No.1, and ECM connector E30, terminal No. 11 and pressure sensor connector R43, terminal No. 2. In each case, if resistance is one ohm or less, go to next step. If resistance is more than one ohm, repair open in harness between ECM and pressure sensor connector, repair poor contact in ECM connector, repair poor contact in fuel tank pressure sensor connector, or repair poor contact in any harness coupling between ECM and pressure sensor connector. Measure resistance between fuel tank pressure sensor connector R43, terminal No. 1 and ground. If resistance is not 500,000 ohms or more, repair short in harness between ECM and fuel tank pressure sensor connector. If there is 500,000 ohms or more resistance, repair poor contact in pressure sensor connector or replace fuel tank pressure sensor if necessary.
  4. Turn ignition switch to OFF. Remove right rear quarter trim inside trunk. Disconnect fuel tank pressure sensor connector. Turn ignition switch to ON. Select function mode F18 on SSM to read pressure sensor output signal. If value is 7.2 kPa or more, repair short circuit in harness between ECM and fuel tank pressure sensor connector. If value is less than 7.2 kPa, replace fuel tank pressure sensor.
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