Understanding the diagnostic codes of your Acura Integra is crucial for maintaining its performance and longevity. Whether you’re a seasoned car enthusiast or a new owner, deciphering these codes can save you time and money by identifying potential issues early on. This guide will walk you through understanding and reading OBD codes for your Acura Integra, focusing on models both before and after the introduction of OBD2 systems.
Understanding OBD1 and OBD2 in Acura Integra
Acura Integra models span across different years, which means they utilize different On-Board Diagnostics (OBD) systems. Early models, roughly from 1986 up to 1995, primarily used the OBD1 system. This system, while functional, was less standardized than its successor. From 1996 onwards, the automotive industry, including Acura, transitioned to OBD2, a more comprehensive and standardized system.
The key difference relevant to you as an Integra owner lies in how you retrieve diagnostic codes. OBD1 systems in early Integras typically require you to read blink codes directly from the Engine Control Unit (ECU). OBD2 systems, standard in 1996 and newer models, utilize a standardized diagnostic port and require an OBD2 scanner tool to read the codes.
Reading OBD Codes on Your Acura Integra
For 1986-1993 Acura Integra (OBD1):
On these models, the ECU, often located on the passenger side under the dash (you might need to pull back the carpet to access it), is equipped with an LED indicator. This LED flashes in patterns to communicate diagnostic trouble codes.
To read the codes:
- Locate the ECU: Find the ECU under the passenger side dash. Look for a small window on the ECU casing that reveals an LED.
- Observe the LED flashes: The ECU communicates codes through long and short flashes.
- Long flashes: Each long flash represents 10.
- Short flashes: Each short flash represents 1.
- Code separation: If multiple codes are present, the LED will pause for approximately 2-3 seconds between each code. The codes will then loop, repeating the sequence.
- Record the codes: Carefully count and write down the flashes. For example, one long flash followed by six short flashes indicates code 16.
Example Code Reading (OBD1):
- (Long Flash) (Short Flash) (Short Flash) (Short Flash) (Short Flash) (Short Flash) (Short Flash) = Code 16
- (Short Flash) (Short Flash) (Short Flash) (Short Flash) (Short Flash) = Code 5
For 1994-2000 Acura Integra (OBD1 & OBD2 Transition):
For Integras in this range, particularly pre-1996 models, the system might still utilize blink codes, but the Check Engine Light (CEL) on your dashboard will now flash instead of requiring you to directly access the ECU LED. For 1996 and newer Acura Integras, which are OBD2 compliant, you will need an OBD2 scanner tool. These scanners plug into the standardized OBD2 port, usually located under the driver’s side dashboard.
Using an OBD2 Scanner (1996-2000 Acura Integra):
- Locate the OBD2 port: It’s typically found under the driver’s side dashboard.
- Plug in the scanner: Connect your OBD2 scanner to the port.
- Turn the ignition ON: Turn your key to the “ON” position without starting the engine.
- Follow scanner instructions: Power on the scanner and follow its prompts to read diagnostic trouble codes. The scanner will display the codes on its screen.
Acura Integra OBD Code Lists
Here are common OBD codes for Acura Integra models. Note that code lists can slightly vary, and it’s always best to consult a model-specific repair manual for the most accurate information.
OBD1 Codes (Approx. 1986-1993 Acura & Honda):
- 0: ECU System
- 1: Oxygen Content (O2 Sensor)
- 3: MAP Sensor (Manifold Absolute Pressure Sensor)
- 4: Crank Angle Sensor
- 5: MAP Sensor
- 6: Coolant Temperature Sensor
- 7: Throttle Angle Sensor
- 8: TDC Position Sensor (Top Dead Center)
- 9: No. 1 Cylinder Position Sensor
- 10: Intake Air Temperature Sensor
- 12: Exhaust Gas Recirculation (EGR) System
- 13: Atmospheric Pressure Sensor
- 14: Electronic Air Control System (EACV/IACV)
- 15: Ignition Output Signal
- 16: Fuel Injector
- 17: Vehicle Speed Sensor (VSS)
- 43: Fuel Supply System
OBD1/OBD2 Era Codes (Approx. 1992-2000 Acura & Honda – Check with specific model year for OBD2 compliance):
- 0: ECU System
- 1: Oxygen Content (O2 Sensor)
- 3: MAP Sensor
- 4: Crank Angle Sensor
- 5: MAP Sensor
- 6: Coolant Temperature Sensor
- 7: Throttle Angle Sensor
- 8: TDC Position Sensor
- 9: No. 1 Cylinder Position Sensor
- 10: Intake Air Temperature Sensor
- 12: Exhaust Gas Recirculation (EGR) System
- 13: Atmospheric Pressure Sensor
- 14: Electronic Air Control System
- 15: Ignition Output Signal
- 16: Fuel Injector
- 17: Vehicle Speed Sensor
- 20: Electronic Load Detector (ELD)
- 21: VTEC Solenoid Valve (1.8L GSR)
- 22: VTEC Oil Pressure Switch (1.8L GSR)
- 23: Knock Sensor
- 30: TCM Signal A (Transmission Control Module)
- 31: TCM Signal B (Transmission Control Module)
- 41: O2 Sensor Heater
- 43: Fuel Supply System
- 45: System Too Rich or Too Lean
- 48: Primary Heated O2 Sensor
- 54: Crankshaft Speed Fluctuation Sensor
- 61: Primary O2 Sensor Circuit
- 63: Secondary O2 Sensor Circuit
- 65: Secondary O2 Sensor Circuit
- 67: Catalyst System Efficiency
- 70: Automatic Transaxle System
- 71-74: Random Misfire Detected
- 80: Exhaust Gas Recirculation (EGR) System
- 86: Engine Coolant Temperature Circuit
- 90: Evaporative Emission Control System Leak Detected (EVAP)
- 91: Fuel Tank Pressure Circuit
- 92: Evaporative Emission Control System Insufficient Purge Flow
Disclaimer: This information is for general guidance only. Always refer to your Acura Integra’s specific service manual for accurate diagnostic procedures and code interpretations. If you are unsure about diagnosing or repairing your vehicle, consult a qualified automotive technician.
Understanding your Acura Integra’s OBD codes is a powerful first step in vehicle maintenance. By using this guide, you can begin to diagnose issues and ensure your Integra continues to run smoothly for years to come.
