Chapter 1: Electronic Circuit Matrix Chart

2004 Toyota Matrix XR, FWD, StandardSECTION Chapter 1: Electronic Circuit Matrix Chart
WARNING: This page is about a different variant/trim than selected.
PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION (ELECTRONIC CIRCUITS)

Symptom Suspect Area
No up-shift (A particular gear, from 1st to 3rd gear, is not up-shifted) ECM
No up-shift (3rd β†’ O/D)
  1. O/D main switch circuit
  2. Electronically controlled transmission communication circuit (1)
  3. O/D cancel signal circuit (1)
  4. ECM
No down-shift (O/D β†’ 3rd)
  1. O/D main switch circuit
  2. Electronically controlled transmission communication circuit (1)
  3. O/D cancel signal circuit (1)
  4. ECM
No down-shift (A particular gear, from 3rd to 1st gear, is not down-shifted) ECM
No lock-up or No lock-up off ECM
Shift point too high or too low ECM
Upshift to 2nd while in L position ECM
Up-shift to 3rd while in 2 position ECM
Up-shift to O/D from 3rd while O/D main switch is OFF
  1. O/D main switch circuit
  2. Electronically controlled transmission communication circuit (1)
  3. O/D cancel signal circuit (1)
  4. ECM
Up-shift to O/D from 3rd while engine is cold ECM
Harsh engagement (N β†’ D) ECM
Harsh engagement (Lock-up) ECM
Harsh engagement (Any driving position) ECM
Poor acceleration ECM
No kick-down ECM
Engine stalls when starting off or stopping ECM
Malfunction in shifting
  1. Park/neutral position switch circuit
  2. ECM
(1) w/Cruise Control
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.