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If DRV (INP) is still always zero, adjust the DRV (INP) sensor so that the gap to the magnet is as small as possible without touching the magnet or balancing weights. Next, turn the driveshaft (inputshaft) until the magnet passes from more than 2" away from the sensor to closer than 1/4" to the sensor. The LCD display should show a small nonzero number for a moment. If you can't move the driveshaft (inputshaft), then you may remove the sensor from the bracket and then move the sensor from far away to nearby the magnet. If you do get a LCD display reading, then the DRV (INP) input is working properly.

If DRV (INP) remains zero, unplug the sensor and work with the connector on the cable coming from the junction box. Short a screwdriver or wire between the two conductors of the connector. A LCD display reading should result. If it does not, call for customer support.

5.5. DRV is erratic or noisy

You may find yourself in the following situation. You’re in the shop and your car stationary. The DRV reads zero on the LCD display with the engine off, but registers random values when the engine is on. If you find this to be the case, then your DRV sensor circuit is picking up ignition noise. The junction box includes a DRV sensor circuit that is already filtering much of your ignition noise out. Evidently, your ignition system generates such strong electromagnetic noise that the filter can not eliminate all of it.

You have a few options at this point. First check the location of your ignition module and your ignition coil relative to your DRV sensor, wiring, junction box, and DATAPRO- 45™. If it is possible to put more distance between them, then do so.

If you still can't eliminate the noise on your DRV sensor, then inspect your ignition wiring. Most likely, you have a zero resistance (solid core) wire from your coil to your distributor, a zero resistance rotor button, and zero resistance spark plug wires. You will need to replace these wires with a higher quality radio noise suppression type wire, such as MSD 8.5 mm Super Conductor wires.

5.6. Switch status (S1-S4) is backwards

If the LCD indicates the opposite of the desired switch position, then you have the switch status configured backwards. See the on-line documentation of your DATAPRO ON-LINEsoftware.

5.7. Switch (S1-S4) is always on or off

Copyright 1999 Computech Systems Inc


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