Operating Instructions - Snap-on Equipment

General MaintenanceWhen using the OBD RPM pickup do not connect the other tachometer pickups.Engine speed is obtained from the OBD Diagnostic connector located inside thepassenger compartment of the vehicle.Connecting to the Vehicle1. Inside the vehicle, locate the OBD Diagnostic Connector; referenceAppendix A for connector locations.2. Using the long communications cable, which is connected to the RS232OUT connector on the FGA and the black OBD diagnostic interface device,plug the interface into the vehicle’s OBD connector. Make sure theconnection is seated properly.3. With the engine running, RPM from the vehicle computer displays.✓ Some vehicles are known NOT to communicate with OBD IItesting devices. If communications cannot be established, turn offthe vehicle for at least 12 seconds, disconnect and then reconnectthe OBD II device and try again. If problems persist, use a differentRPM pickup device.✓ Because of the wide variety and complex design of today's ignitionsystems it may not be possible to obtain stable RPM from somesystems even with the variety of pickup choices provided.Using the Optional Oil Temperature KitIn order to use the optional Oil Temperature measurement kit, you must have theoptional RPM kit. A common connection on the FGA is used for both. Theinstallation instructions provided with the Oil Temperature kit provide informationabout connection to the FGA.A quick review of connections follows: Connect one leg of the yellow Y cable to thecommunication panel of the FGA. Connect the Oil Temperature probe into thecommon connector of the Y and RPM into the other leg of the Y.Connecting to the Engine1. Remove the dip stick from the vehicle. Measure the engine oil level andinsure the crankcase is full.2. Place the brass end of the oil temperature probe even with the end of thedip stick and slide the black rubber stopper up on the probe until it is evenwith the dip stick seal on the dip stick. This positions the oil temperatureprobe properly in the crankcase.3. Slide the Oil Temperature probe into the dipstick and place the rubberstopper into the dipstick tube.✓ Improper probe length can result in damage to the probe andcontact with the crankshaft within the engine. ALWAYSPROPERLY MEASURE THE LENGTH.✓ On many of today's vehicles the dipstick tube must be sealed toensure proper air fuel mixture. Make sure the stopper fits snuglyinto the dipstick tube.✓ As an alternative to oil temperature, the temperature of the upperradiator hose can be used as an indicator of a warm engine. Tomeasure temperature at this point simply secure the probe to theradiator hose with duct tape. The temperature here may be higherthan the oil temperature.4-7