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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1991RANGER 2WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTIONPINPOINT TESTSCLEARING CONTINUOUS MEMORY CODES
1991 Ford Ranger 2WD L4-140 2.3L SOHC
Clearing Continuous Memory Codes
1991 Ford Ranger 2WD L4-140 2.3L SOHCSECTION Clearing Continuous Memory Codes
1. Perform Key ON Engine OFF (KOEO) self test.
2. When service codes begin to be displayed, deactivate self test as follows:
a. STAR tester, position center button in up position.
b. Analog volt/ohmmeter, remove jumper wire from self-test input connector and signal return pin of the self-test connector.
c. Check engine light, remove jumper wire from self-test input connector and signal return pin of the self-test connector.
3. Continuous codes should now be erased.
2. When service codes begin to be displayed, deactivate self test as follows:
a. STAR tester, position center button in up position.
b. Analog volt/ohmmeter, remove jumper wire from self-test input connector and signal return pin of the self-test connector.
c. Check engine light, remove jumper wire from self-test input connector and signal return pin of the self-test connector.
3. Continuous codes should now be erased.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.