WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL OIL LEVEL SENSOR Copyright © 2001 General Motors Corp. 5–2. ELECTRONIC FLUID LEVEL CHECK (SHIFT SELECTOR) CAUTION: A low or high fluid level causes overheating and irregular shift patterns. An incorrect fluid level can damage the transmission. NOTE: The pushbutton and lever shift selectors can display one character at one time. The strip pushbutton shift selector has no diagnostic or display capability. The ATDTTM or Pro-Link® 9000 or a customer- furnished remote display must be used to obtain fluid level information when using the strip pushbutton shift selector. A. Fluid Level Check Procedure 1.
Park the vehicle on a level surface and shift to N (Neutral). Apply the parking brake. 2. On the Pushbutton shift selector, simultaneously press the ⇑ (Up) and ⇓ (Down) arrow buttons once. 3. On the Lever shift selector, press the “display mode” button once. 4. For a strip pushbutton shift selector, refer to the ATDTTM User Guide (GN3433EN), the Pro-Link® 9000 manual, or to Appendix N in this manual. NOTE: The ECU may delay the fluid level check until the following conditions are met: • The fluid temperature is between 60°C (140°F) and 104°C (220°F). • The transmission is in N (Neutral). • The vehicle has been stationary for approximately two minutes to allow the fluid to settle.
• The engine is at idle (below 1000 rpm — not “fast” idle). See “Invalid for Display” information in Steps (8) and (9). 5. Correct fluid level is reported when o, L is displayed (o, L indicates the Oil Level Check Mode), followed by o, K. The o, K display indicates the fluid level is within the proper fluid level zone. Remember that the display occurs one character at a time. The sensor display and the transmis- sion dipstick may not agree exactly because the oil level sensor compensates for fluid temperature. Example: o, L; o, K — Indicates correct fluid level. 6. Low fluid level is reported when o, L is displayed, followed by L, o and a number.
L, o indicates a low fluid level and the number is the number of quarts of fluid the transmission requires. Example: o, L; L, o; 2 — Indicates 2 additional quarts of fluid will bring the fluid level within the proper fluid level. 7. High fluid level is reported when o, L is displayed, followed by H, I and a number. H, I indicates high fluid level and the number shows how many quarts the transmission is overfilled. Example:o, L, H, I, 1 — Indicates one quart of fluid above the full level.