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Home >> Mitsubishi >> 2002 >> Montero XLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0181: Fuel Temperature Sensor Circuit Range/Performance Problem >> Test Procedure
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Test Procedure

  1. Turn ignition on. Using scan tool, check data list item No. 4A (fuel temperature sensor). Air temperature, as measured with a thermometer, and fuel temperature displayed on scan tool should be within 10 percent of each other. If temperature is not as specified, go to next step. If scan tool readings are as specified, problem is intermittent. See INTERMITTENT DIAGNOSTIC TROUBLE CODES . If scan tool readings are not as specified, go to next step.
  2. Disconnect fuel temperature sensor 3-pin connector. See Figure. Check fuel temperature sensor connector for loose, damaged, or corroded terminals. If problem exists, repair or replace connector. Go to step  12. If problem does not exist, go to next step.
  3. Measure resistance between fuel temperature sensor terminals No. 2 and 3 (component side). Resistance should be between 0.5-12.0 K ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel temperature sensor. Then go to step  12.
  4. Check continuity between ground and fuel temperature sensor 3-pin connector terminal No. 2 (Black wire). If continuity exists, go to next step. If continuity does not exist, check intermediate 8-pin connector F-07 for damage and repair as necessary. See Figure. If intermediate 8-pin connector F-07 is OK, repair open in wire between fuel temperature sensor 3-pin connector terminal No. 2 (Black wire) and ground. Then go to step  12.
  5. Turn ignition on. Measure voltage between ground and fuel temperature sensor 3-pin connector terminal No. 3 (Light Green/Red wire). There should be between 4.5-4.9 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  10.
  6. Reconnect fuel temperature sensor 3-pin connector. Turn ignition on. Measure voltage between ground and PCM connector D-108 terminal No. 51 (Light Green/Red wire) by backprobing. See Figure. See FUEL TEMPERATURE SENSOR VOLTAGE SPECIFICATIONS . If voltage is as specified, go to next step. If voltage is not as specified, go to step  8.
    FUEL TEMPERATURE SENSOR VOLTAGE SPECIFICATIONS

    Volts Fuel Temperature °F (°C)
    2.7 - 3.1 32 (0)
    2.1 - 2.5 68 (20)
    1.6 - 2.0 104 (40)
    0.8 - 1.2 176 (80)
  7. Disconnect PCM connector D-108. See Figure. Check PCM connector D-108 for loose, damaged, or corroded terminals. If problem exists, repair or replace connector. Go to step  12. If problem does not exist, check intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 for damage and repair as necessary. See Figure. If intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 are OK, repair Light Green/Red wire between fuel temperature sensor 3-pin connector terminal No. 3 and PCM connector D-108 terminal No. 51. Then go to step  12.
  8. Disconnect PCM connector D-108. See Figure. Check PCM connector D-108 for loose, damaged, or corroded terminals. If problem exists, repair or replace connector. Go to step  12. If problem does not exist, go to next step.
  9. Disconnect fuel temperature sensor 3-pin connector. With PCM D-108 connector disconnected, check continuity between ground and fuel temperature sensor 3-pin connector terminal No. 3 (Light Green/Red wire). If there is continuity, check intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 for damage and repair as necessary. See Figure. If intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 are OK, repair short to ground in wire between fuel temperature sensor 3-pin connector terminal No. 3 (Light Green/Red wire) and PCM connector D-108 terminal No. 51. Then go to step  12. If there is no continuity, replace PCM, and go to step  12.
  10. Disconnect PCM connector D-108. See Figure. Check PCM connector D-108 for loose, damaged, or corroded terminals. Also check intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 for damage and repair as necessary. See Figure. If intermediate 8-pin connector F-07, 14-pin connector E-113 and 43-pin connector D-111 are OK, repair or replace connector(s). Go to step  12. If problem does not exist, go to next step.
  11. Disconnect fuel temperature sensor 3-pin connector. With PCM D-108 connector disconnected, check continuity between ground and fuel temperature sensor 3-pin connector terminal No. 3 (Light Green/Red wire). If there is continuity, repair short to ground in wire between fuel temperature sensor 3-pin connector terminal No. 3 (Light Green/Red wire) and PCM connector D-108 terminal No. 51. Then go to next step. If there is no continuity, replace PCM, and go to next step.
  12. Test drive vehicle following OBD-II drive cycle Other Monitor pattern. See OTHER MONITOR  under OBD-II DRIVE CYCLES under VERIFYING REPAIRS. Check for DTCs. If DTC P0181 is output, go to step  1, and retry diagnostic procedure. If DTC P0181 is not output, inspection is complete.
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