1986 Jeep Comanche Base, 2.8 W, 4WD, StandardFACTORY OEM SERVICE PROCEDURE

Code/Chart Menu

TEST DESCRIPTION MENU

Test Description
Chart 1 Dwell Fixed Under 10°
Chart 2 Dwell Fixed Between 10°-50°
Chart 3 Dwell Fixed Over 50°
Chart 4 TPS Enrichment Check
Chart 5 Check Engine Light Inoperative
Chart 6 Code 12 Does Not Flash (Remote Lamp Driver In Harness)
Chart 7 Vacuum Sensor Test
Chart 8 Engine Cranks But Won't Start
Chart 9 Intermittent Engine Operation Or Engine Misfires
Trouble Code 12 No Reference Pulses To ECM
Trouble Code 13 Open Oxygen Sensor Circuit
Trouble Code 14 Shorted Coolant Sensor Circuit
Trouble Code 21 Open TPS Circuit Or Misadjusted
Trouble Code 23 Open Or Grounded M/C Solenoid
Trouble Code 34 Vacuum Sensor Voltage
Trouble Code 41 No Distributor Reference Signal
Trouble Code 42 By-pass Or Est Problem
Trouble Code 44 Lean Exhaust Indication
Trouble Code 45 Rich Exhaust Indication
Trouble Code 51 PROM Problem
Trouble Code 55 Faulty Oxygen Sensor Or Ecm
Factory Service Tools

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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.

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