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Code 24: Vehicle Speed Sensor

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS article in this section.
  1. Manufacturer does not provide Vehicle Speed Sensor (VSS) testing procedures using scan tester. VSS is located in speedometer. VSS component testing procedures using DVOM require removal of instrument panel. Removal and installation of instrument panel is basically an unbolt and bolt-on procedure.
  2. On all models, use DVOM to check continuity between indicated VSS terminals. See Fig 1 or Fig 2 . Ensure continuity pulses on and off 4 times per speedometer shaft revolution. If continuity is not as specified, replace VSS. If continuity is as specified, go to step 4.
  3. Remove VSS. Connect battery, resistor (3-10 ohms) and voltmeter to indicated terminals. See Fig 1 or Fig 2 . Ensure voltage pulses 4 times per speedometer shaft revolution. If voltage is not as specified, replace VSS. If voltage is as specified, go to next step.
    Fig 1: VSS Test Terminal ID (Eclipse)
    G93A01839Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 2: VSS Test Terminal ID (Galant)
    G93B02189Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. Disconnect ECM connector. Using DVOM, check continuity between chassis ground and specified ECM connector terminal. See VSS OUTPUT CIRCUIT ID  table. Move vehicle. Ensure continuity pulses on and off 4 times per tire revolution. If continuity is as specified: On Eclipse, conditions required to set code are not present at this time, test is complete; on Galant, go to step 7. If continuity is not as specified: On Eclipse, go to step 6. On Galant, go to next step.
    VSS OUTPUT CIRCUIT ID

    Application Terminal No.
    Eclipse 18
    All Other Models 66
  5. With ECM connector disconnected, disconnect VSS connector. Ground ECM connector VSS output terminal. See VSS OUTPUT CIRCUIT ID  table. Using DVOM, check for continuity between chassis ground and specified VSS connector terminal. See ECM TO VSS CIRCUIT ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    ECM TO VSS CIRCUIT ID

    Application Terminal No.
    All Models 9
  6. With VSS connector disconnected, check for continuity between chassis ground and specified VSS connector terminal. See VSS GROUND CIRCUIT ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    VSS GROUND CIRCUIT ID

    Application Terminal No.
    Eclipse 2
    Galant 16
  7. With VSS connector and ECM connector disconnected, turn ignition switch to ON position. Using DVOM, check for voltage between chassis ground and specified VSS connector terminal. See VSS VOLTAGE FEED CIRCUIT ID  table. If voltage is not 4.5-4.9 volts, replace ECM. If voltage is as specified, condition required to set fault is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in this section.
    VSS VOLTAGE FEED CIRCUIT ID

    Application Terminal No.
    Eclipse 59
    Galant 9
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