Chapter 2: On-Vehicle Repair

2004 Toyota Matrix XR, FWD, StandardSECTION Chapter 2: On-Vehicle Repair
WARNING: This page is about a different variant/trim than selected.
PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSAXLE

Symptom Suspect Area
Vehicle does not move in any forward position and reverse position
  1. Valve body assembly (Manual valve)
  2. Valve body assembly (Primary regulator valve)
  3. Valve body assembly (Secondary regulator valve)
  4. Off-vehicle repair matrix chart
Vehicle does not move in R position
  1. Valve body assembly (Manual valve)
  2. Off-vehicle repair matrix chart
No up-shift(1st→2nd)
  1. Valve body assembly (1-2 shift valve)
  2. Off-vehicle repair matrix chart
No up-shift(2nd β†’ 3rd)
  1. Valve body assembly (2-3 shift valve)
  2. Off-vehicle repair matrix chart
No up-shift (3rd β†’ O/D)
  1. Valve body assembly (3-4 shift valve)
  2. Off-vehicle repair matrix chart
No down-shift (O/D β†’ 3rd) Valve body assembly (3-4 shift valve)
No down-shift (3rd β†’ 2nd) Valve body assembly (2-3 shift valve)
No down-shift (2nd β†’ 1st) Valve body assembly (1-2 shift valve)
No lock-up or No lock-up off
  1. Valve body assembly (Lock-up relay valve)
  2. Valve body assembly (Lock-up control valve)
  3. Valve body assembly (Solenoid relay valve)
  4. Valve body assembly (Solenoid modulator valve)
  5. Off-vehicle repair matrix chart
Harsh engagement (N β†’ D)
  1. Valve body assembly (C-1 accumulator)
  2. Valve body assembly (Accumulator control valve)
  3. Off-vehicle repair matrix chart
Harsh engagement (N ↓ R)
  1. Valve body assembly (C3 accumulator)
  2. Valve body assembly (Accumulator control valve)
  3. Valve body assembly (Reverse control valve)
  4. Off-vehicle repair matrix chart
Harsh engagement (Lock-up)
  1. Valve body assembly (Lock-up relay valve)
  2. Valve body assembly (Accumulator control valve)
  3. Valve body assembly (Lock-up control valve)
  4. Off-vehicle repair matrix chart
Harsh engagement (1st ↓ 2nd)
  1. Valve body assembly (B2 accumulator)
  2. Valve body assembly (Accumulator control valve)
Harsh engagement (2nd β†’ 3rd)
  1. Valve body assembly (C2 accumulator)
  2. Valve body assembly (Accumulator control valve)
Harsh engagement (3rd -O/D)
  1. Valve body assembly (B1 accumulator)
  2. Valve body assembly (Accumulator control valve)
  3. Valve body assembly (3-4 shift timing valve)
Harsh engagement (O/D β†’ 3)
  1. Valve body assembly (3-4 shift timing valve)
  2. Valve body assembly (4-3 shift timing valve)
Harsh engagement (D, 2, L position) Valve body assembly (Coat relay valve)
Slip or shudder (forward and reverse)
  1. Oil strainer
  2. Off-vehicle repair matrix chart
No engine braking (1st: L position)
  1. Valve body assembly (Reverse control valve)
  2. Off-vehicle repair matrix chart
No engine braking (2nd: 2 position) Valve body assembly (3-4 shift valve)
No kick-down
  1. Valve body assembly (1-2 shift valve)
  2. Valve body assembly (2-3 shift valve)
  3. Valve body assembly (3-4 shift valve)
Poor acceleration Valve body assembly
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.