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Code 24: Vehicle Speed Sensor

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For wiring diagrams, see WIRING DIAGRAMS in the WIRING DIAGRAMS  section.
  1. Manufacturer does not provide Vehicle Speed Sensor (VSS) testing procedures using scan tool. On Galant, go to step 3). On all other models, 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. Use DVOM to check continuity between indicated VSS terminals. See Fig 1-Fig 3. 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. VSS is located at end of speedometer cable in transmission. Remove VSS. Connect battery, resistor (3-10 ohms) and voltmeter to indicated terminals. See Fig 1-Fig 3. 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: Identifying VSS TEST Terminals (Expo & Summit Wagon)
    G95I31540Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
    Fig 2: Identifying VSS TEST Terminals (Galant)
    G95J31541Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
    Fig 3: Identifying VSS TEST Terminals (Pickup)
    G95B31543Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
  4. Disconnect PCM connector. Using DVOM, check continuity between chassis ground and specified PCM connector terminal. See VSS OUTPUT CIRCUIT IDENTIFICATION  table. Move vehicle. Ensure continuity pulses on and off 4 times per tire revolution. If continuity is as specified: on Galant, conditions required to set code are not present at this time, test is complete; on all other models, go to step 7). If continuity is not as specified: on Galant, go to step 6); on all other models, go to next step.
    VSS OUTPUT CIRCUIT IDENTIFICATION

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

    Application Terminal No.
    Pickup 1
    All Other Models 9
  6. With VSS connector disconnected, check for continuity between chassis ground and specified VSS connector terminal. See VSS GROUND CIRCUIT IDENTIFICATION  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    VSS GROUND CIRCUIT IDENTIFICATION

    Application Terminal No.
    Expo & Summit Wagon 5
    Galant 16
    Pickup 10
  7. With VSS connector and PCM 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 IDENTIFICATION  table. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, condition required to set trouble code is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES - 2.4L article.
    VSS VOLTAGE FEED CIRCUIT IDENTIFICATION

    Application Terminal No.
    Pickup 1
    All Other Models 9
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