Fitment notes: Standard top post battery for 258ci I6 engine
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Every control module on the 1981-1986 Jeep CJ-7 — where it lives, replacement time, and what it takes to program a replacement.
Engine Control Module (ECM)1.2 hr R&Rno coding
📍 Passenger side firewall or under passenger seat (varies by year and engine)
⚠️ Only on 1981-1983 models with optional California emissions 258 I6 (feedback carburetor) and 1984-1986 with throttle-body fuel injection (2.5L or 4.2L). Fixed calibration, no reprogramming. Most CJ-7s remained carbureted with no ECM through 1986.
Hazard Flasher0.2 hr R&Rno coding
📍 Under dash, near fuse block
⚠️ Separate relay, no electronics.
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 1986 Jeep CJ-7 258ci I6 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.