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OBD I Trouble Codes

Decoding your VIN
OBD I Fault Code Detail
Code 24
Vehicle Speed Sensor (VSS) Circuit
Vehicle speed information is provided to the ECM by the vehicle speed sensor, a Permanent Magnet (PM) generator mounted in the transmission.  The PM generator produces a pulsing voltage whenever the vehicle speed is over about 3 mph.  The A/C voltage level and the number of pulses increases with vehicle speed.  The ECM converts the pulsing voltage to mph, and the mph can be displayed with a scan tool.

The function of the VSS buffer, used in past model years, has been incorporated into the computer.  The computer supplies the necessary signal for the instrument panel (4004 pulses per mile) for operating the speedometer and the odometer.

Code 24 will set if vehicle speed equals less than 3 mph when:

-  Engine is running
-  No Code 28 or 31
-  When P/N swich is open (indicating drive range)
-  When high gear switch is open indicating transmission is in third gear
-  RPM is greater than 1000
-  All conditions met for 40 seconds
.
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