WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL WIRE CHECK PROCEDURES Copyright © 2001 General Motors Corp. CAUTION: The cleaning solvent must not be chlorine based, contain petroleum distillates, or conduct electricity. The cleaning solvent should evaporate quickly to prevent the 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. (Refer to SIL 17-TR-94 for detailed information on the recommended cleaners.) a. At the transmission connector, check the resistance of the A solenoid circuit.
Resistance of a solenoid circuit should be 2.4–5 Ohms — covering a temperature range of –18°C to 149°C (0°F to 300°F). Refer to Solenoid Resistance vs. Temperature chart in Appendix K. 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- METER (VOM) INFINITE ( ) OHMS 2–5 OHMS Circuit does not have continuity due to a AT NORMAL OPERATING broken wire (open circuit).
VOM reading is TEMPERATURE* very high (infinite ohms or OL–overlimit). Circuit has continuity. This could also be due to an open solenoid coil or bad connection. * Refer to Appendix J V03376.01 Figure 4–3. 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 4–4): (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.