Copyright © 1998 General Motors Corp. 6–37
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Main code 23 indicates a fault with a shift selector or the wiring between a shift selector and the ECU.
Active Indicator Clearing Procedure:
• Power down
• Manual
• Self-clearing
NOTE: Before troubleshooting, read Pages 6–17 and 6–18 of Section 6–5.
Troubleshooting:
1. Clear the active indicator for Code 23 XX. If code recurs, continue to Step 2.
2. Check for a poor connection at the shift selector.
3. If this is a remote shift selector, disconnect the external harness connectors from the ECU and
from the remote shift selector and check for opens, shorts, and shorts-to-ground between the shift
selector and ECU (refer to Section 4). Repair as needed (refer to Appendix E).
4. If no problem is found with the shift selector connection or wiring, replace the shift selector.
5. Use care in separating and disconnecting the shift selector head from the ECU. If this is a remote
shift selector, replace the shift selector assembly.
6. 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.
Main
Code
Subcode Meaning
23 12
Primary shift selector or RSI link fault — a “cateyes” type
display may occur
23 13 Primary shift selector mode button
23 14
Secondary shift selector or RSI link fault — a “cateyes” type
display may occur
23 15 Second shift selector mode button
CAUTION:
Static electricity can destroy the EEPROM. When replacing an integral shift selector, use
Anti-Static Wrist Strap BT 8639-B to prevent a static electricity discharge to the EEPROM.
CODE 23 XX — SHIFT SELECTOR (Figures 6–9)
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