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 MANUALSPLYMOUTH1985CONQUEST L4-2555CC 2.6L SOHC TURBOREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE DESCRIPTIONS
1985 Plymouth Conquest L4-2555cc 2.6L SOHC Turbo
Diagnostic Trouble Code Descriptions
1985 Plymouth Conquest L4-2555cc 2.6L SOHC TurboSECTION Diagnostic Trouble Code Descriptions
To access ATC trouble codes:
1. Connect an analog voltmeter between the ATC diagnostic terminal and the ground terminal of the self-diagnosis connector. The diagnostic connector is located below the glove box.
2. Turn the ignition switch to the ON position.
3. Any trouble codes that are present will be displayed as a pattern of long and short voltage pulses. Long voltage pulses indicate the "tens' digit while the short voltage pulses indicate the "units" digit. Individual digits are separated by a voltmeter indication of 0 volts.
4. Compare the pattern displayed on the voltmeter with the pattern listed on the Fault Code Pattern Chart.
5. Proceed to the diagnostic chart indicated by the pattern.
1. Connect an analog voltmeter between the ATC diagnostic terminal and the ground terminal of the self-diagnosis connector. The diagnostic connector is located below the glove box.
2. Turn the ignition switch to the ON position.
Fault Code Display (Example):
3. Any trouble codes that are present will be displayed as a pattern of long and short voltage pulses. Long voltage pulses indicate the "tens' digit while the short voltage pulses indicate the "units" digit. Individual digits are separated by a voltmeter indication of 0 volts.
Fault Code Patterns:
4. Compare the pattern displayed on the voltmeter with the pattern listed on the Fault Code Pattern Chart.
5. Proceed to the diagnostic chart indicated by the pattern.
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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.