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Code 41: Fuel Injector

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
  1. Using a stethoscope or long-bladed screwdriver, listen for clicking sound from each injector while engine is running or being cranked. If no sound is heard from injector(s), check injector connections. If connections are not okay, repair connections as necessary. If connections are okay, go to next step.
  2. Disconnect injector connector. Using DVOM, check resistance across injector terminals. If resistance is not 13-16 ohms, replace injector. If resistance is as specified, go to next step.
  3. Using scan tester, read injector drive time while cranking engine. See INJECTOR CRANKING DRIVE TIME SPECIFICATIONS  table. Go to next step.
    INJECTOR CRANKING DRIVE TIME SPECIFICATIONS

    Coolant Temperature Drive Time
    32°F (0°C)
    Stealth Turbo 8.8-10.8 ms
    3000GT Turbo 8.1-9.9 ms
    Stealth & 3000GT Non-Turbo 13.8-16.8 ms
    68°F (20°C)
    Stealth Turbo 25.6-31.2 ms
    3000GT Turbo 26.1-31.9 ms
    Stealth & 3000GT Non-Turbo 40.0-48.8 ms
    176°F (80°C)
    Stealth Turbo 5.5-6.7 ms
    3000GT Turbo 6.3-7.7 ms
    Stealth & 3000GT Non-Turbo 8.6-10.6 ms
  4. Ensure coolant temperature is at 176-205°F (80-95°C), all accessories are off and transaxle is in Neutral position. Using scan tester, read injector drive time under specified engine conditions. See INJECTOR OPERATING DRIVE TIME SPECIFICATIONS  table. Go to next step.
    INJECTOR OPERATING DRIVE TIME SPECIFICATIONS

    Engine State Drive Time
    750 RPM
    Non-Turbo 2.3-3.5 ms
    Turbo 1.6-3.8 ms
    2000 RPM
    Non-Turbo 2.0-3.3 ms
    Turbo 1.4-2.6 ms
    Suddenly Accelerated
    All Models (1)
    (1) Drive time should increase.
  5. Allow engine to idle after warm up. Using scan tester, shut off injectors in sequence. Idle should change when good injectors are shut off. If idle state does not change, check injector connection, spark plug and cable, and cylinder compression. If conditions are not as specified in preceding steps, go to next step.
  6. Disconnect MFI relay resistor connector. Turn ignition switch to ON position. Using DVOM, check for voltage between chassis ground and resistor connector terminal No. 2. See Fig 1 . If battery voltage does not exist, repair wiring harness as necessary between MFI relay resistor connector and MFI relay. If battery voltage exists, reconnect MFI relay resistor connector. Go to next step.
    Fig 1: Identifying MFI Relay Resistor Terminals
    G93H80280Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
  7. If faulty injector is on rear injector bank, go to next step. Disconnect injector connector at faulty front injector. Turn ignition switch to ON position. Using DVOM, check voltage between chassis ground and injector connector terminal No. 1. If battery voltage does not exist, repair wiring harness as necessary between injector connector and MFI relay. If voltage exists, go to step 18).
  8. Disconnect rear bank injector connector. Using DVOM, check voltage between chassis ground and injector connector terminal No. 1. If battery voltage does not exist, repair wiring harness as necessary between injector connector and MFI relay. If voltage exists, go to step 10).
  9. With injector connector disconnected, disconnect ECM connector. Ground ECM connector terminal No. 1 for injector No. 1, No. 2 for injector No. 3, or No. 3 for injector No. 3. Using DVOM, check for continuity between chassis ground and injector connector terminal No. 2. If continuity does not exist, repair wiring harness as necessary between appropriate injector connector and ECM connector terminal. If continuity exists, condition required to set code is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
  10. With rear bank injector connector disconnected, disconnect ECM connector. Ground ECM connector terminal No. 14 for injector No. 2, No. 15 for injector No. 4, or No. 16 for injector No. 6. Using DVOM, check for continuity between chassis ground and rear bank injector connector terminal No. 2 for injector No. 2, No. 3 for injector No. 4, or No. 4 for injector No. 6. If continuity does not exist, repair wiring harness between rear bank injector connector and ECM connector. If continuity exists, condition required to set code is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
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