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 MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONREADING AND CLEARING DIAGNOSTIC TROUBLE CODESREADING DIAGNOSTIC TROUBLE CODESQUICK TEST APPENDIX (DETAILED TESTING INSTRUCTIONS)READING SELF-TEST SERVICE CODESKEY-ON/ENGINE OFF
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Key-On/Engine Off
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Key-On/Engine Off
Fig. 26 Self-test code output format. Key ON/Engine OFF:
At this time, a test of the EEC-IV system is conducted with the power applied and the engine OFF. For self-test to detect errors in this test, the fault must be present at the time of testing Fig. 26. For intermittent errors, refer to Continuous Test.
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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.