WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL OIL LEVEL SENSOR Copyright © 2001 General Motors Corp. 8. An Invalid for Display condition is reported when o, L is displayed, followed by “–” and a number display. The displayed number is a fault code and indicates improper conditions or a system mal- function. Example: o, L, –, 7,0 — Indicates an Invalid for Display condition and fault code 70. 9. Invalid for Display is activated when conditions do not allow the fluid level to be checked electroni- cally. Review the following codes and conditions, and correct as necessary. Table 5–1.
Invalid for Display Codes CODE CAUSE OF CODE X * — Settling time too short 5 0 , — Engine speed (rpm) too low 5 9 , — Engine speed (rpm) too high 6 5 , — N (Neutral) must be selected 7 0 , — Sump fluid temperature too low 7 9 , — Sump fluid temperature too high 8 9 , — Output shaft rotation 9 5 , — Sensor failure** * A number between 8 and 1 that flashes during the count- down period. ** Speed sensor, throttle sensor, temperature sensor, or oil level sensor. 10. To exit the fluid level display mode: • Pushbutton shift selector — press the N (Neutral) pushbutton or press ⇑ and ⇓ arrow pushbuttons simultaneously two times.
• Lever shift selector — press the “display mode” button two times or move the lever. 5–3. ELECTRONIC FLUID LEVEL CHECK (PRO-LINK® 9000) The ATDTTM or Pro-Link® 9000 (DDR) can also be used to electronically check the transmission’s fluid level. Further detail is also provided in Appendix N of this manual. CAUTION: A low or high fluid level causes overheating and irregular shift patterns and, if not corrected, can damage the transmission. A. Fluid Level Check Procedure 1. Connect the DDR to the DDR connector.