If you own a OBDI Acura or Honda and your check engine light is on, you need a way to check it. Because your vehicle doesn’t come with an OBDII port for you to tap into using a scan tool, you need another method to retrieve your Honda Trouble Codes. Just because you own a OBD1 Honda doesn’t mean you don’t have a diagnostic port. You can easily read your Honda trouble codes with just a single wire.
This is typically done by jumping the two pin blue harness that’s nearby your ECU. Once you jumper this connector you’ll see your Honda check engine light flash on and off.
You will be interpreting your Honda trouble codes through a process that will remind you of Morse code. Single digit Honda trouble codes 1-9 will be shown as individual blinks of your Honda check engine light.
Honda trouble codes 10 and up will have one long blink and several shorter blinks. Long blinks of your Honda check engine light on signify 10, while short flashes signify 1. Using this method you can easily determine the Honda Trouble Codes that are causing your issues.
Tips to read your Honda trouble codes
- Use a small wire – Don’t shove or force a large gauge wire into the DLC port connector.
- Be patient – There may be more than one code, so make sure to be patient.
- Double check – Reading Honda trouble codes doesn’t take a lot of time, make sure to double check to get the code correct.
List of OBD1 Honda trouble codes
Code 0 – Engine Control Module
1 – Heated Oxygen Sensor #1 – Upstream O2
2 – Heated Oxygen Sensor #2 – Downstream O2
3 – Manifold Absolute Pressure (MAP) Sensor
4 – Crankshaft position sensor
5 – Manifold Absolute Pressure (MAP) Sensor
6 – Engine Coolant Temperature Sensor
7 – Throttle Position Sensor (TPS)
8 – Top Dead Center Position Sensor
9 – Number 1 Cylinder Position Sensor
10 – Intake Air temperature (IAT) Sensor
12 – Exhaust Gas Recirculation (EGR) Valve
13 – Barometric Pressure Sensor
14 – Idle Air Control (IAC) Valve
15 – Ignition Output Signal
16 – Fuel Injector
17 – Vehicle Speed Sensor
20 – Electrical Load Detector
21 – VTEC Electric Control Solenoid Valve
22 – VTEC Pressure Switch
23 – Knock Sensor
30 – Automatic Transmission A Signal
31 – Automatic Transmission B Signal
41 – Heated Oxygen Sensor Heater Element
43 – Fuel Supply System
45 – Fuel System Too Rich or Too Lean
48 – Lean Air / Fuel Sensor
54 – Crankshaft Speed Fluctuation Sensor
58 – Top Dead Center Position Sensor #2
61 – Primary Oxygen Sensor – Upstream O2
63 – Secondary Oxygen Sensor – Downstream O2
65 – Secondary Oxygen Sensor Heater
67 – Catalyst System Efficiency
70 – Automatic Transaxle
71 – Cylinder one or Random Misfire
72 – Cylinder two or Random Misfire
73 – Cylinder three or Random Misfire
74 – Cylinder four or Random Misfire
75 – Cylinder five or Random Misfire
76 – Cylinder six or Random Misfire
80 – Exhaust gas Recirculation Valve – EGR
86 – Engine Coolant Temperature Sensor
90 – Evaporative Emission Control System
91 – Fuel Tank Pressure Sensor
92 – Evaporative Emission Control System
