Vehicle Speed Sensor (VSS)
- Turn ignition off. Connect test harness between ECM and main harness connector. See Figure
. Raise and support front of vehicle so front wheels are free to rotate. Connect voltmeter between ECM terminals B10 and A26. See Figure
.
- Turn ignition on. Slowly rotate left front wheel. Voltage should pulse between zero and specified voltage. See VEHICLE SPEED SENSOR (VSS) TEST
table. If voltage pulses as specified, replace ECM and retest system. If voltage does not pulse as specified, check for open or short in wiring between ECM terminal B10 and speed sensor. See WIRING DIAGRAMS
article in this section. If wiring is okay, replace defective VSS or ECM.
VEHICLE SPEED SENSOR (VSS) TEST
| Application |
Volts |
| Except H22A1 Engine |
5 |
| H22A1 Engine |
12 |