GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: During acceleration transmission will not downshift - kick down

Output speed sensor (74)

    • Perform electrical function test on the output speed sensor (74).
    • Replace the output speed sensor (74) if fails electrical function test.

Transmission control module (TCM)

    • Perform function test on the TCM.
    • Replace the TCM if fails function test.

2-3 Shift solenoid valve assembly (S1) (313)

    • Perform electrical function tests on the 2-3 shift solenoid valve assembly (S1) (313).
    • Replace the 2-3 shift solenoid valve assembly (S1) (313) if fails electrical function tests.

1-2/3-4 Shift solenoid valve assembly (S2) (316)

    • Perform electrical function tests on the 1-2/3-4 shift solenoid valve assembly (S2) (316).
    • Replace the 1-2/3-4 shift solenoid valve assembly (S2) (316) if fails electrical function tests.