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 MANUALSFORD1987TEMPO AWD L4-140 2.3L HSCREPAIR 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 CODESSERVICE CODE SEQUENCE
1987 Ford Tempo AWD L4-140 2.3L HSC
Service Code Sequence
1987 Ford Tempo AWD L4-140 2.3L HSCSECTION Service Code Sequence
There are three parts to the self-test, which are the Key-ON/Engine-OFF, Computed Ignition Timing Check and Engine Running.
Key-ON/Engine-OFF--Checks the system inputs for faults (malfunctions) that occur during the self-test procedure, and intermittent faults (malfunctions) that occurred prior to the self-test procedure.
Computed Ignition Timing Check--Checks the ECA's ability to advance or retard ignition timing.
Engine Running--Checks system outputs for faults (malfunctions) only.
During the Key-ON/Engine-OFF part of the self-test, the following should be obtained or noted on the STAR tester:
1. Fast codes--LED light flickers.
2. ON-Demand codes--Hard faults (malfunctions).
3. Separator code--Numeral 10.
4. Memory codes--Intermittent faults (malfunctions).
During the Engine Running portion of the self-test, the following should be obtained or noted on the STAR tester:
1. Engine identification code--Numerals 20, 30 or 40.
2. Dynamic response code--Numeral 10.
3. Fast codes--LED light flickers.
4. ON-Demand codes--Hard faults (malfunctions).
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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.