DTC 24

Fig. 005 Code 24 Vehicle Speed Sensor:

Fig. 006 - Wiring Diagram for Code 24 Vehicle Speed Sensor. VIN P:

CODE 24, VSS (2.0L)

The ECM supplies a current limited 12 volt signal on CKT 437. The VSS located in the I.P. cluster will sense the speedometer rotating element and furnish this information to the buffer as a "Pulsed" signal, 2 per cable revolutions of 2002 pulses per mile.
The buffer assembly will switch CKT 437 to ground for each pulse received. The ECM uses the time between pulses to determine vehicle speed.
Code 24 is set by the following:
- CKT 437 voltage is constant. No rise and fall of voltage for a specified time, 4 to 10 seconds.
- Engine speed between 1500 and 4400 RPM.
- Park/Neutral switch indicates transmission selector is in Drive range.
- Low MAP (High Vacuum) indicating an engine decel.
Loss of VSS will affect:
- Torque Converter Clutch
- Idle Air Control
- Fan Control will not shut off above 30 MPH with A/C on

1. Checks to see if there is a VSS signal to the ECM while turning a drive a wheel. Normally voltage will vary from under 3 volts to over 6 volts as Wheel is turned slowly. The faster the wheel is turned, the less the variation.