1994 Eagle Summit LX, AutomaticFACTORY OEM SERVICE PROCEDURE

Code 24: Vehicle Speed Sensor

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE 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. Use DVOM to check continuity between indicated VSS terminals. See Fig 1 . 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 . 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
    G93D80278Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. Disconnect ECM connector. Using DVOM, check continuity between chassis ground and terminal No. 66. Move vehicle. Ensure continuity pulses on and off 4 times per tire revolution. If continuity is as specified: go to next step; If continuity is not as specified: go to step 7).
  5. With ECM connector disconnected, disconnect VSS connector. Ground ECM connector VSS output terminal No. 66. Using DVOM, check for continuity between chassis ground and VSS connector terminal No. 43. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  6. With VSS connector disconnected, check for continuity between chassis ground and VSS connector terminal No. 12. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  7. With VSS connector and ECM connector disconnected, turn ignition switch to ON position. Using DVOM, check for voltage between chassis ground and VSS connector terminal No. 43. If voltage is not 4.5-4.9 volts, replace ECM. 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 article in the ENGINE PERFORMANCE Section.
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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.