Fitment notes: Small Japanese battery; verify clearance with OEM hold-down
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Every control module on the 1981-1987 Toyota Corolla — where it lives, replacement time, and what it takes to program a replacement.
Combination Meter (METER)1.5 hr R&Rno coding
📍 Instrument panel, behind gauge cluster
⚠️ Electromechanical; no electronic control module in most variants. Digital clusters (rare) may have basic logic board but no coding required.
Engine Control Unit (ECU)1.2 hr R&Rno coding
📍 Under passenger seat or behind kick panel, right side
⚠️ Only on fuel-injected models (4A-GE, 4A-LC). Carbureted models have no ECU. Early units are analog; no programming capability. Plug-and-play replacement.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1981 Toyota Corolla 1.8L 3T-C OHV I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.