For 1990-2009 cars

Condition | Action
--- | ---
DEFINITION: Harsh forced downshift felt when accelerating
Input speed sensor (76) |

• | Perform electrical function test on the input speed sensor (76).

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

Battery voltage |

• | Inspect battery for correct voltage.

• | Repair charging system or replace battery.

Engine or transmission mounts |

• | Inspect the engine mounts and the transmission mounts for wear or loose mounting fasteners.

• | Replace any faulty engine or transmission mounts or loose fasteners.

Suspension system |

• | Inspect suspension components.

• | Replace faulty suspension components.

Transmission oil temperature sensor (32) |

• | Perform function test on the transmission oil temperature sensor (32).

• | Replace the automatic transmission wiring harness assembly (78).

Line pressure control solenoid valve assembly (SLT) (312) |

• | Perform electrical function checks on the line pressure control solenoid valve assembly circuit.

• | Perform electrical function check on the line pressure control solenoid valve assembly (312).

• | Replace valve body assembly (39) if line pressure control solenoid valve assembly (312) is faulty.

Transmission control module (TCM) |

• | Perform function test on the TCM.

• | Replace TCM if fails function test.

Valve body (39) | Replace valve body (39).
Internal transmission parts |

• | Disassemble the transmission and inspect for the following:

- | Missing retaining rings

- | Worn or broken thrust needle bearings and thrust washers

- | Differential assembly backlash

- | Worn drive and driven gears

- | Worn planetary gear assemblies

• | Replace the transmission if any faulty parts.