C-1540 & I-130 with only the ignition on go to the Pdm screen & go to configuration mode then go to Plc inputs & outputs watch the speed wheel input (Figure1) and get someone to turn the speed wheel manually to see if there is an alternating on/off signal going to the plc if not then there is either a bad connection orfaulty sensor.

Speed Wheel Troubleshooting_REV01_20100526.pdf

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