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 MANUALSTOYOTA1988COROLLA DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCOMPUTER CONTROL SYSTEMDIAGNOSIS & TESTINGSYSTEM TESTING
1988 Toyota Corolla DX, 4D Sedan, Automatic
System Testing
1988 Toyota Corolla DX, 4D Sedan, AutomaticSECTION System Testing
- If trouble codes exist and diagnostic circuit check has been performed, compare code with appropriate code chart for circuits and components associated with trouble code(s). Trouble code flow charts are arranged in alphabetical order by each model. A test No. has been assigned each chart. The test No. and trouble code are in numerical order for each model. All ECU pin identifications are at end of TROUBLE CODES & PROBABLE CAUSE charts.
- If no code is present, circuit checking is necessary. Each model has a ECU PIN VOLTAGE TEST table after DIAGNOSTIC CIRCUIT CHECK flow chart. DIAGNOSTIC CIRCUIT CHECK flow chart is the first flow chart on each model. Using ECU PIN VOLTAGE TEST table, check appropriate circuits using the test No. in the right column of the appropriate table.
- Component testing will also be necessary. All component testing available from manufacturer and pertaining to CEC, follow the CEC flow charts. For components not covered, see appropriate article in FUEL or DISTRIBUTORS & IGNITION SYSTEMS.
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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.