Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

3

This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch can set a DTC P1870.

4

This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 4th gear; and confirms that the fault is present.

5

This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 3rd gear.

6

This step tests for a sticking TCC shift valve.

8

This step tests for proper transmission line pressure.