Snap-on PAC Ground Check Instructions
PROCEDURESnap-on PAC Ground Check Instructions
CAUTION:
Make sure that the key is in the "OFF" position and the vehicle is not running-before making these checks.
1. Prepare the PAC for operation as follows:
^ Connect green terminal "Grnd Chk" lead to green receptacle on PAC.
^ Connect yellow terminal "Grnd Chk" lead to yellow receptacle on PAC.
^ Connect black clip on yellow "Grnd Chk" lead to battery negative terminal.
^ Connect red clip of yellow "Grnd Chk" lead to battery positive terminal.
2. Turn PAC unit ON
NOTE:
There will be two icons which appear in the upper left corner of the screen.
3. Touch "GND CHK" screen icon.
4. Touch the "CAL" icon.
5. When prompted by the PAC, touch the green lead to the negative battery terminal to calibrate the unit.
NOTE:
A click will be heard and the screen will flicker to indicate the calibration has-taken place. It is important to calibrate the unit before any ground checks are performed. Always calibrate the PAC unit each time it is turned on.
6. Remove the green lead from the negative battery terminal.
7. Attach green lead to the ground circuit to be tested and touch the "RUN" icon on the PAC screen.
NOTE:
Refer to the illustrated charts for important ground locations to be checked.
8. When the PAC unit beeps indicating the ground check is complete, press the "TOUCH TO STOP" icon.
9. Read the measured resistance on the display.
10. Acceptable resistance values for the ground circuits are:
^ 0.00 to 0.05 ohms for ground circuits of low amperage (radio, lighting etc.)
^ 0.00 to 0.10 ohms for ground circuits of high amperage (starter circuit etc.)
^ 0.00 to 0.40 ohms for engine sensor ground circuits measured at the sensor
Procedure to obtain a good ground:
1. Remove the fastener that holds ground wires to the vehicle.
2. Inspect the post and nut or bolt for corrosion.
3. If the mating surfaces or the post and nut are corroded, use a wire brush to clean them.
4. If the surface where the eyelet contacts the vehicle is a painted surface, place a star washer between the painted surface and the eyelet.
5. Replace the eyelet and tighten the nut or bolt to 6 to 7 Nm. (50 to 60 lb.in.).
6. Coat complete connection with anti-corrosion wax