SYMPTOM RELATED DIAGNOSTICS

BUFFERED MPH (continued)

Test 8

Checking for a pin-to-pin short or a short to ground in the harness

1.Disconnect the serial link jumper.

2.Check for pin-to-pin continuity from J1B connector pin W2 to each of the other pins (one at a time) of the J1B connector.

If there is continuity with another pin, the buffered MPH line is shorted to ground in the harness or at the connectors. Locate and repair the short. Retest to be sure the problem has been corrected.

If there is no continuity, proceed to Test 16.

Test 16

Checking for an open in the harness

1.Connect a jumper between J1B connector pins P1 and W2.

2.Check for continuity from the buffered MPH line, on the harness side of the speedometer connector, to a good ground.

If there is continuity, proceed to Test 32.

If there is no continuity, the buffered MPH line is open in the harness. Locate and repair the open. Retest to be sure the problem has been corrected.