GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Emergency mode inoperative when commanded by the TCM

Output speed sensor (74)

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

Input speed sensor (76)

    • Perform electrical function test on the input speed sensor (76).
    • Replace the input speed sensor (76) if fails test.

Torque control

Inspect for proper function of the torque control device.

Park/neutral position switch (72)

    • Perform function test on the park/neutral position switch (72).
    • Replace the park/neutral position switch (72) if faulty.

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 (S 1) (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.

Lock-up control solenoid (SLU) (310)

    • Perform electrical function test on the lock-up control solenoid (SLU) (310).
    • Replace the valve body if the lock-up control solenoid (SLU) (310) is faulty.

Valve body (39)

Replace valve body (39).

Internal transmission failure

    • Disassemble the transmission and inspect for failed components.
    • If failed components, replace transmission assembly.