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.
1985 Jeep Pickup J20FACTORY OEM SERVICE PROCEDURE
Test Chart Menu
SYSTEM TEST CHARTS
| Chart No. | Test |
|---|---|
| No. 1 | Operational Test |
| No. 2 | Switch Test |
| No. 3 | Closed Loop Test |
| No. 4 | Knock Test |
| No. 5 | Oxygen Sensor and Closed Loop Test |
| No. 6 | "Downstream" Solenoid Test |
| No. 7 | "Upstream" Solenoid Test |
| No. 8A | Bowl Vent Test |
| No. 8B | PCV Shut-Off Test |
| No. 8C | Anti-Diesel System Test |
| No. 9 | Idle Speed Control System Test |
| No. 10 | Sole-Vac Vacuum Switching Relay Test |
| No. 11 | Basic Engine Test |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.