Figure 43. Checking Continuity

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

WIRE CHECK PROCEDURES

The cleaning solvent must not be chlorine based, contain petroleum distillates, or

conduct electricity. The cleaning solvent should evaporate quickly to prevent the

CAUTION:

possibility of condensation within the connectors. Always blow or shake any excess

cleaner from the connector before assembling it to its mating connector or hardware.

Cleaner trapped in the connector can affect the connector seal.

a. At the transmission connector, check the resistance of the A solenoid circuit. Resistance of a

solenoid circuit should be 2.45 Ohms -- covering a temperature range of 18C to 149C

(0F to 300F). No continuity in the circuit (infinite resistance) indicates an open in the internal

harness, the feedthrough connector, or the solenoid coil. Locate and repair the open in the internal

harness or replace the internal harness, replace the feedthrough connector, or replace the solenoid.

SOLENOID

FEEDTHROUGH

HARNESS

CONNECTOR

3.5

VOLT/OHM-

( ETER

VOM)

INFINITE (

) OHMS

25 OHMS

Circuit does not have continuity due to a

T NORMAL OPERATING

broken wire (open circuit). VOM reading is

EMPERATURE*

very high (infinite ohms or OLoverlimit).

This could also be due to an open solenoid

Circuit has continuity.

coil or bad connection.

V03376.01

* Refer to Appendix J

Figure 43. Checking Continuity

b. If the resistance check is good, check the harness for shorts between wires and to ground by per-

forming the following (refer to Figure 44):

(1) At the transmission connector, touch one probe of the VOM to one wire of the circuit being

tested and touch the other probe to each terminal in the connector and to chassis ground and

the transmission main housing. Do this for both wires in the circuit being tested.

(2) If the VOM shows zero to low resistance, or the continuity beeper sounds, there is a short

between the two points being probed, wire-to-wire or wire-to-ground. An indication of a short

may be caused by a splice to the wire being checked. Check the wiring diagram in Appendix J

for splice locations. If the short is not a splice, then isolate and repair the short.

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