Copyright © 1998 General Motors Corp. 6–87
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Troubleshooting:
1. Check the transmission connector and make sure it is tightly connected. If the connector is
properly connected, disconnect the harness at the transmission and check the terminals in the
external harness and feedthrough connectors. Clean or replace as necessary (Appendix E).
2. If the connector is connected, clean, and not damaged, check the solenoid circuit in the
transmission for opens. Refer to the system schematic and/or chart to identify wires in the internal
harness which are connected. If the open circuit is found, drain the fluid, remove the control
module (see the transmission Service Manual), and isolate the open. The fault will be in the
feedthrough connector, internal harness, or the solenoid itself (see Figure 6–1 for solenoid
locations).
3. If the open is not found at the transmission connector, disconnect the connectors at the ECU and
inspect the terminals in the connectors and the ECU for damage or contamination. Clean or
replace as necessary. If the terminals are satisfactory, check the wires of the solenoid circuit in the
external harness for continuity. If the open is found in one of the wires, isolate and repair it or use
a spare wire in the external harness. See Appendix D for location of spare wires and Appendix E
for information on connector/wire repair.
4. If the open is not found in either the transmission or the harness, the condition must be
intermittent.
5. Drain the fluid, remove the control module, and replace the solenoid and internal harness (refer to
the transmission Service Manual).
6. If the condition recurs, use spare wire(s) for the solenoid circuit indicated by the diagnostic
code. See Appendix D for location of spare wires and Appendix E for information on connector
assembly/disassembly.
7. If the condition persists, replace the ECU. If replacing the ECU corrects the problem, reinstall the
original (bad) ECU to confirm that the problem is in the ECU. If the original ECU now works,
inspect the ECU connectors for any corrosion or damage which may cause an intermittent
condition. If the original problem recurs, reinstall the replacement ECU.
CODE 45 XX — OPEN CONDITION IN SOLENOID CIRCUIT
(Figures 6–32, 6–33)
To Next Page
Loading...