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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERSTARTING SYSTEMBENCH TESTINGCOMMUTATOR TEST
2004 Toyota Celica GT, Standard
Commutator Test
2004 Toyota Celica GT, StandardSECTION Commutator Test
- 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.