Copyright © 1998 General Motors Corp. 6–71
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
3. If the short is not found at the transmission connector, disconnect the connectors at the ECU and
check the wires of the solenoid circuit for shorts between the solenoid wires and all other terminals
in both connectors (at the ECU). If the short is found in one of the wires, isolate and repair it or use
a spare wire (Appendix E, 1–7).
4. If the short is not found in either the transmission or the harness, the condition must be
intermittent.
5. Drain the fluid, remove the control module (see the transmission Service Manual), and replace the
internal harness.
6. If the condition recurs, use spare wire(s) in the external harness for the solenoid circuit indicated
by the trouble code. (Refer to Appendix D for location of spare wire(s) and Appendix E for
connector assembly/disassembly information.)
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 42 XX — SHORT-TO-BATTERY IN SOLENOID CIRCUIT
(Figures 6–24, 6–25)
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