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 MANUALSTOYOTA1984CRESSIDA 4D WAGONREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMTCCS ENGINE CONTROL SYSTEMTESTINGRECALLING TROUBLE CODESDIAGNOSTIC CODE OUTPUT
1984 Toyota Cressida 4D Wagon
Diagnostic Code Output
1984 Toyota Cressida 4D WagonSECTION Diagnostic Code Output
- After entering diagnostic mode, the voltmeter needle should indicate 5 volts for 2 seconds; then 2.5 volts for 2 seconds. This code ("start code") signifies the start of diagnostic code output. See Fig 1.
- If no trouble codes are stored in ECU memory, the "start code" will be displayed, followed by the "system normal" code. The "system normal" code consists of a series of needle fluctuations between 5 volts and 2.5 volts at 0.6 second intervals.
- Trouble codes are displayed in the following manner: After the "start code", the voltmeter needle will deflect a number of times between 2.5 volts and 5 volts at 0.6 second intervals. This is the first digit of the trouble code.
- The needle will then indicate 2.5 volts for 2 seconds ("separator code"). Next, the needle will fluctuate between 2.5 volts and 0 volt at 0.6 second intervals. This is the second digit of the trouble code.
- Trouble codes will be displayed from lowest to highest numbered code. Output of the diagnostic codes will continue as long as the diagnostic mode is activated. A "separator code" follows display of first and second digit of trouble codes, and separates each trouble code. A "start code" will be displayed at the beginning of each pass through the output.
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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.