A. Inspect Transmission Duty Cycle

NOTE:
Only vehicles with high duty cycle operation, as determined by the inspection below, require transmission cooler replacement. Very few vehicles are expected to require transmission cooler replacement.

1. Connect the DRBIII(R) to the data link connector located under the instrument panel. Turn the ignition key to the "ON" position.

2. Select # 1 - "DRBIII(R) Standalone" from Main Menu screen.

3. Select # 1 - "1998 - 2004 Diagnostics" from Standalone Main Menu screen.

4. Select # 1 - "All (Except Below)" from 1998 - 2004 Diagnostics screen.

5. Select # 1 - "Engine" from Select System screen.

6. Select # 1 - "Diesel" from Engine Controller Type screen.

7. Press ENTER two (2) times to continue.

8. Select # 2 - "Duty Cycle Monitor".

9. Record the duty cycle value for the 91-100% range.

10. Press PAGE BACK to exit and then disconnect the DRBIII(R).

11. > If the 91-100% duty cycle value is GREATER THAN 3.5%, the engine-mounted transmission cooler must be replaced. Continue with Section C - Replace Engine-Mounted Transmission Cooler and Cooler Line.

> If the 91-100% duty cycle value is 3.5% OR LESS, the transmission cooler does NOT require replacement. Only the cooler line requires replacement.

12. Inspect the engine coolant for indications of contamination with transmission fluid. If the coolant is contaminated, the transmission cooler must be replaced and the coolant system must be flushed. Continue with Section C - Replace Engine-Mounted Transmission Cooler and Cooler Line.

13. Inspect the transmission fluid for indications of contamination with engine coolant. If the transmission fluid is contaminated, the transmission cooler must be replaced and the transmission must be rebuilt or replaced. Continue with Section C - Replace Engine-Mounted Transmission Cooler and Cooler Line.

14. Inspect the engine-mounted transmission cooler for signs of external fluid leakage. If the cooler shows signs of leakage, the engine-mounted transmission cooler must be replaced. Continue with Section C - Replace Engine-Mounted Transmission Cooler and Cooler Line.

15. If the engine coolant and transmission fluid were NOT contaminated and there are no external cooler leaks, continue with Section B - Replace Transmission Cooler Line.