Copyright © 1998 General Motors Corp.
6–65
W T E C I I E L E C T RO N I C C O N T RO L S T RO U B L E S H O OT I N G M A N UA L
Troubleshooting:
1. Make sure the transmission connector 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.
2. If the connector is connected, clean, and not damaged, check the solenoid circuit in the
transmission for opens or shorts to other wires (refer to the temperature/resistance chart). Refer to
the system schematic and/or chart to identify wires in the internal harness which are connected. If
an open or short circuit is located, drain the fluid, remove the control module (refer to the
transmission Service Manual), and isolate the open or short. The fault is probably in the
feedthrough connector, the internal harness, or the solenoid itself (refer to Figure 6–1 for solenoid
location).
3. If the open or short 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 and shorts-to-ground or shorts between wires. If an open or
short is found in one of the wires, isolate and repair it or use a spare wire in the external harness.
4. If the open or short 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 trouble code. See
Appendix D for location of spare wires 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 41 XX — OPEN OR SHORT-TO-GROUND IN SOLENOID CIRCUIT
(Figures 6–21, 6–22)
