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.
1995 Honda Prelude VTECFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes - 2.2L
- Introduction
- Self-Diagnostic System
- Diagnostic Trouble Code Identification
- Test Equipment
- Engine Code Identification
- Connector Identification
- Accord Diagnostic Trouble Codes
- Notes
- DTC 0 - Engine Control Module (ECM)
- DTC 1 - Heated Oxygen Sensor (Ho2S)
- DTC 3 - Manifold Absolute Pressure (Map) Sensor
- DTC 4, 8 & 9 - Crankshaft Position (CKP) Sensor, Top Dead Center (TDC) Sensor & Cylinder Position (CYP) Sensor
- DTC 6 - Engine Coolant Temperature (ECT) Sensor
- DTC 7 - Throttle Position (TP) Sensor
- DTC 10 - Intake Air Temperature (IAT) Sensor
- DTC 12 - Exhaust Gas RECIRCULATION (EGR) Valve Lift Sensor
- DTC 13 - Barometric Pressure (BARO) Sensor
- DTC 14 - Idle Air Control (IAC) Valve
- DTC 15 - Ignition Output Signal
- DTC 16 - Fuel Injector
- DTC 17 - Vehicle Speed Sensor (VSS)
- DTC 20 - Electrical Load Detector (Eld)
- DTC 21 - Variable Valve Timing & VTEC Solenoid Valve
- DTC 22 - Valve Lift Electronic Control (VTEC) Pressure Switch
- DTC 30 - A/T FI Signal A
- DTC 31 - A/T FI Signal B
- DTC 41 - Heated Oxygen Sensor (Ho2S) Heater
- DTC 43 - Fuel Supply System
- Odyssey Diagnostic Trouble Codes
- Notes
- DTC 0 - Malfunction Indicator Light
- DTC 0 - Malfunction Indicator Light (Mil) Stays On
- DTC 1
- DTC 3 - Manifold Absolute Pressure
- DTC 4, 8 Or 9 - CKP Sensor, TDC Sensor
- DTC 6 - Engine Coolant Temperature
- DTC 7 - Throttle Position Sensor
- DTC 10 - Intake Air Temperature (IAT) Sensor
- DTC 12 - Exhaust Gas RECIRCULATION (EGR) System
- DTC 13 - Barometric Pressure (BARO) Sensor
- DTC 14 - Idle Air Control (IAC) Valve
- DTC 15 - Ignition Output Signal
- DTC 16 - Fuel Injectors
- DTC 17 - Vehicle Speed Sensor (VSS)
- DTC 20 - Electrical Load Detector (Eld)
- DTC 30 & 31 - A/T FI Signal A & A/T FI Signal B
- DTC 41 - Heated Oxygen Sensor (Ho2S) Heater
- DTC 43 - Fuel Supply System
- Prelude Diagnostic Trouble Codes
- Notes
- No DTC - No Start Trouble Shooting
- DTC 1 - Heated Oxygen Sensor (Ho2S) Circuit
- DTC 3 - Map Sensor Circuit
- DTC 4, 8 And/Or 9 - TDC/CKP/CYP Sensor
- DTC 5 - Map Sensor Circuit
- DTC 6 - Engine Coolant Temperature (ECT) Sensor
- DTC 7 - Throttle Position (TP) Sensor
- DTC 10 - Intake Air Temperature (IAT) Sensor
- DTC 12 - EGR System
- DTC 13 - Barometric Pressure (BARO) Sensor
- Code 14 - Idle Air Control (IAC) Valve
- DTC 15 - Ignition Output Signal
- DTC 16 - Fuel Injectors
- DTC 17 - Vehicle Speed Sensor (VSS)
- DTC 20 - Electrical Load Detector (Eld)
- DTC 21 - VTEC Solenoid Valve
- DTC 22 - VTEC Pressure Switch
- DTC 23 - Knock Sensor (KS)
- DTC 30 Or 31 - A/T FI Signal "A" (30) Or "B" (31)
- DTC 41 - Heated Oxygen Sensor (Ho2S) Heater
- DTC 43 - Fuel Supply System
- Summary
- Wiring Diagrams
Factory Service Tools
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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.