2003 Mitsubishi Lancer EvolutionFACTORY OEM SERVICE PROCEDURE

Output Current Test

Required special tool: MB991502: Scan Tool MUT-II, MB991958: Scan Tool MUT-III Sub Assembly, MB991824: V.C.I., MB991827 MUT-III USB Cable, MB5991911: MUT-III Main Harness B. This test determines whether the generator outputs normal current. For best results, use a charging system tester. If not available, follow the steps below. See Fig 1 .

Fig 1: Output Current Test
G00367563Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    WARNING: Battery posts, terminals and related accessories contain lead and lead compounds. Wash hands after handling.
  1. Before the test, always be sure to check the following.
    • Generator installation.
      • NOTE: The battery to be used should be slightly discharged. The load in a fully-charged battery will be insufficient and the test may not be able to be carried out correctly.
    • Battery.
    • Generator drive belt tension.
    • Fusible link.
    • Abnormal noise from the generator while the engine is running.
  2. Turn the ignition switch to the LOCK (OFF) position.
    3. WARNING: Never use clips to connect the line. Loose connections (for example, using clips) will lead to a serious accident because of high current.
  3. Disconnect the negative battery cable.
  4. Connect a clamp-type DC test ammeter with a range of 0-100A to the generator B terminal output wire.
  5. Connect a voltmeter with a range of 0-20V between the generator B terminal and ground. (Connect the positive lead of the voltmeter to the B terminal, and then connect the negative lead of the voltmeter to ground.)
  6. Connect the negative battery cable.
  7. Connect an engine tachometer or scan tool MB991958.
  8. Leave the hood open.
    9. NOTE: If the voltage is 0 V, the cause is probably an open circuit in the wire or fusible link between the generator B terminal and the battery positive terminal.
  9. Check to be sure that the reading on the voltmeter is equal to the battery positive voltage.
    10. NOTE: Because the current from the battery will soon drop after the engine is started, the next step should be carried out as quickly as possible in order to obtain the maximum current output value.
  10. After turning on the headlights, start the engine.
    11. NOTE: The current output value will depend on the electrical load and the temperature of the generator body.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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