CHAPTER
10
Manual No. 016-0159-925 Rev. F
69
Chapter 10
Testing Extension
Cables
Speed Sensor Cables
Disconnect the extension cable from speed sensor assembly cable. Hold the extension cable connector so that
the keyway is in the 12 o’clock position.
FIGURE 1.
Speed Sensor Extension Cable Connector Pins
Note:
If a radar type speed sensor is used, the voltage between the 10 o’clock and 2 o’clock positions
may read 12 VDC.
If a +5V DC voltage reading is not present, disconnect the flow meter cable and re-test the speed
sensor cable. If the voltage reads +5V DC when the flow meter cable is disconnected, test the flow
meter cable per Testing the Flow Meter Cable section on page 70.
Testing the Speed Sensor Cable
1.
Press SPEED CAL and enter a value of 9999 as the speed cal.
2.
Press DISTANCE to monitor the SCS console’s odometer while testing this cable.
3.
Use a small jumper wire or paper clip to short the 10 o’clock and 6 o’clock sockets with a “short-no short”
motion. Each time the short is made, the distance reading should increase by increments of 1 or more.
4.
If the distance does not increase, disconnect this section of cable and repeat this test at the next connector
closest to console. Replace defective cable as required and test the speed sensor cable voltage as
previously described.
5.
If all cables test good, replace the speed sensor.
Note:
After testing is complete, re-enter correct speed cal number.
10 o’clock
Ground
2 o’clock
Power
Keyway
6 o’clock
Signal
5 VDC
5 VDC
