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 MANAGEMENTIGNITION SYSTEMTOOLS AND EQUIPMENTSTAR TESTER & SELF-TEST CONNECTOR HOOK-UP
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Star Tester & Self-Test Connector Hook-Up
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Star Tester & Self-Test Connector Hook-Up
STAR TESTER HOOK UP
The self-test connector and tester hook-up is identical on all models. A two piece self-test connector on the vehicle, plugs into a matching two-piece service connector at the end of the STAR/Self-Test adapter cable assembly. To connect the STAR tester proceed as follows:
1. Turn ignition switch to OFF position.
2. Connect the color-coded adapter cable leads on to the STAR tester.
3. Connect the adapter cables two service connectors to the matching self-test connectors on the vehicle.
To check the STAR tester, turn the power switch, located on the right side of the tester to the ON position. The tester will run a display check and the numerals 88 will begin to flash. A steady 00 will then appear to signify that the tester is ready to start the self-test and receive service codes.
STAR tester & self-test electrical connector assembly:
The self-test connector and tester hook-up is identical on all models. A two piece self-test connector on the vehicle, plugs into a matching two-piece service connector at the end of the STAR/Self-Test adapter cable assembly. To connect the STAR tester proceed as follows:
1. Turn ignition switch to OFF position.
2. Connect the color-coded adapter cable leads on to the STAR tester.
Connecting STAR Tester:
3. Connect the adapter cables two service connectors to the matching self-test connectors on the vehicle.
Star Tester Display:
To check the STAR tester, turn the power switch, located on the right side of the tester to the ON position. The tester will run a display check and the numerals 88 will begin to flash. A steady 00 will then appear to signify that the tester is ready to start the self-test and receive service codes.
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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.