Test Description

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. 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.