Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 297 (STARTING SYSTEM)BENCH TESTINGCOMMUTATOR TEST
2004 Toyota Matrix XR, FWD, Standard
Commutator Test
2004 Toyota Matrix XR, FWD, StandardSECTION Commutator Test
WARNING: This page is about a different car, the 2004 Toyota RAV4 and 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
- If commutator surface is dirty or burnt, it can be cleaned with No. 400 grit sandpaper or on a lathe.
- Place the commutator on V-blocks and use a dial indicator to measure runout (out-of-round). See Fig 1. If commutator runout is more than specification, turn commutator on a lathe and proceed to step 3. For specification, see STARTER SPECIFICATIONS .
- Measure commutator diameter. See Fig 2. If commutator diameter is less than minimum specification, see STARTER SPECIFICATIONS , replace armature.
- Ensure undercut depth between commutator segments are clean, free of debris, and that edges are smooth, and within specification, see Fig 3. If undercut depth is less than minimum, use a hacksaw blade to correct it. See STARTER SPECIFICATIONS .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.