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 MANUALSHONDA1994CIVIC DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSELF-DIAGNOSTIC SYSTEMDIAGNOSTIC TROUBLE CODE DEFINITION
1994 Honda Civic DX, 4D Sedan, Automatic
Diagnostic Trouble Code Definition
1994 Honda Civic DX, 4D Sedan, AutomaticSECTION Diagnostic Trouble Code Definition
DIAGNOSTIC TROUBLE CODE IDENTIFICATION
| Code (1) | System Affected | Probable Cause | ||||
|---|---|---|---|---|---|---|
| 0 | ECM | No Signal To ECM | ||||
| 1 | Oxygen Sensor (O2S) (D15B8 Federal Model) | Problem In HO2S Circuit | ||||
| 1 | Heated Oxygen Sensor (HO2S) (Except D15B8 Fed. Model) | Problem In HO2S Circuit | ||||
| 3 | MAP Sensor | Electrical Problem In MAP Sensor | ||||
| 4 | Crank Angle Sensor (CKP) | Open Or Shorted Signal Circuit | ||||
| 5 | MAP Sensor | Electrical problem in MAP Sensor | ||||
| 6 | Engine Coolant Temperature (ECT) Sensor | Open Or Shorted Signal Circuit | ||||
| 7 | Throttle Position (TP) Sensor | Open Or Shorted Signal Circuit | ||||
| 8 | Crank Angle Sensor (TDC) | Open Or Shorted Signal Circuit | ||||
| 9 | Crank Angle Sensor (CYP) | Open Or Shorted Signal Circuit | ||||
| 10 | Intake Air Temperature(IAT) | Problem With Sensor | ||||
| 12 | EGR System | No EGR Action | ||||
| 13 | Barometric Pressure (BARO) Sensor | Problem With PA Circuit | ||||
| 14 | Idle Air Control(IAC) Valve | Open Or Shorted Signal Circuit | ||||
| 15 | Ignition Output Signal | Electrical Problem In Signal Circuit | ||||
| 16 | Fuel Injector | Problem In Fuel Injector Circuit | ||||
| 17 | Vehicle Speed Sensor (VSS) | Open Or Shorted Signal Circuit | ||||
| 19 | A/T Lock-Up Control Solenoid Valve (Civic & Civic Del Sol) | Problem In Lock-Up Solenoid Circuit | ||||
| 20 (2) | Electrical Load Detector (ELD) | Problem With ELD Circuit | ||||
| 21 | Spool Solenoid Valve (Civic & Civic Del Sol) | Problem With VTEC Spool Solenoid Circuit | ||||
| 22 | VTEC Oil Pressure Switch | Problem In VTEC Oil Pressure Switch Circuit | ||||
| 41 | Heated Oxygen Sensor (HO2S) Heater (D15Z1 Federal Model) | Problem With HO2S Circuit | ||||
| 41 | Heated Oxygen Sensor (HO2S) Heater (Except D15Z1 Fed. Model) | Problem With HO2S Circuit | ||||
| 43 | Fuel Supply System (Except D15B8 Calif. Model) | Problem With HO2S Circuit Or Fuel System | ||||
| 48 | Heated Oxygen Sensor (HO2S) (D15Z1 Federal Model) | HO2S Circuit Fault | ||||
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RENDER: 1.0x
NO RELATED
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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.