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Seen a lot of people ask for this and I haven't come across this anywhere but a few places... hopefully this can help out a few of our members.
Reading the Codes:
The ECU (Electronic Control Unit) gives you the codes in long and short blinks/flashes. For every long flash it is in multiples of 10... each short stands for 1.
Examples:
(Long)(Short)(Short)(Short)(Short)(Short)(Short) = 16
(Short)(Short)(Short)(Short)(Short) = 5
The ECU can also give you more than one code at a time... so if there is more than one code, once the first code is given the LED will remain unlit for approx 2-3 secounds then display/flash a new code. The ecu will continue to loop the codes so if you miss one it will come around and repeat the codes.
Remember to write them down!
'86-'91 Honda and '86-'93 Acura
*Note - This ECU is found on the passenger side underneath the dash, you will have to remove/pull back the carpet to access it - The ECU is equipt. with a window to the flashing LED.
0 ECU
1 Oxygen Content
3 MAP Sensor
4 Crank Angle Sensor
5 MAP Sensor
6 Coolant Temperature
7 Throttle Angle
8 TDC Position
9 No 1 Cylinder Position
10 Intake Air Temperature
12 Exhaust Gas Recirculation System
13 Atmosphere Pressure
14 Electronic Air Control
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor
43 Fuel Supply System
'92-'00 Honda and '94-'00 Acura
*Note: The ECU is located on the passenger side, underneath the dash; however in this year range things were simplified, the CEL (Check Engine Light) will flash vs. having to access the ECU. This does not apply to 1996 and newer computers with the OBDII system. OBDII computers require the use of a code scanner.
0 ECU
1 Oxygen Content
3 Map Sensor
4 Crank Angle Sensor
5 Map Sensor
6 Coolent Temperature
7 Throttle Angle
8 TDC Position
9 No 1 Cylinder Position
10 Intake Air Temperature
63 Intake Air Temperature
12 Exhaust Gas Recirculation System
13 Atmosphere Pressure
14 Electronic Air Control
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor
20 Electronic Load Detector
21 VTEC Solenoid Valve (1.8L GSR)
22 VTEC Oil Pressure Switch (1.8L GSR)
23 Knock Sensor
30 TCM Signal A
31 TCM Signal B
41 O-2 Sensor Heater
43 Fuel Supply System
45 System Too Rich or Too Lean
48 Primary Heated O-2 Sensor
54 Crankshaft Speed Fluctuation Sensor
61 Primary O-2 Sensor Circuit
63 Secondary O-2 Sensor Circuit
65 Secondary O-2 Sensor Circuit
67 Catalyst System
70 Automatic Transaxle
71-74 Random Misfire
80 Exhaust Gas Recirculation
86 Engine Coolant Temperature Circuit
90 Evaporative Emission Control System Leak Detected
91 Fuel Tank Pressure Circuit
92 Evaporative Emission Control System Insufficient
Reading the Codes:
The ECU (Electronic Control Unit) gives you the codes in long and short blinks/flashes. For every long flash it is in multiples of 10... each short stands for 1.
Examples:
(Long)(Short)(Short)(Short)(Short)(Short)(Short) = 16
(Short)(Short)(Short)(Short)(Short) = 5
The ECU can also give you more than one code at a time... so if there is more than one code, once the first code is given the LED will remain unlit for approx 2-3 secounds then display/flash a new code. The ecu will continue to loop the codes so if you miss one it will come around and repeat the codes.
Remember to write them down!
'86-'91 Honda and '86-'93 Acura
*Note - This ECU is found on the passenger side underneath the dash, you will have to remove/pull back the carpet to access it - The ECU is equipt. with a window to the flashing LED.
0 ECU
1 Oxygen Content
3 MAP Sensor
4 Crank Angle Sensor
5 MAP Sensor
6 Coolant Temperature
7 Throttle Angle
8 TDC Position
9 No 1 Cylinder Position
10 Intake Air Temperature
12 Exhaust Gas Recirculation System
13 Atmosphere Pressure
14 Electronic Air Control
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor
43 Fuel Supply System
'92-'00 Honda and '94-'00 Acura
*Note: The ECU is located on the passenger side, underneath the dash; however in this year range things were simplified, the CEL (Check Engine Light) will flash vs. having to access the ECU. This does not apply to 1996 and newer computers with the OBDII system. OBDII computers require the use of a code scanner.
0 ECU
1 Oxygen Content
3 Map Sensor
4 Crank Angle Sensor
5 Map Sensor
6 Coolent Temperature
7 Throttle Angle
8 TDC Position
9 No 1 Cylinder Position
10 Intake Air Temperature
63 Intake Air Temperature
12 Exhaust Gas Recirculation System
13 Atmosphere Pressure
14 Electronic Air Control
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor
20 Electronic Load Detector
21 VTEC Solenoid Valve (1.8L GSR)
22 VTEC Oil Pressure Switch (1.8L GSR)
23 Knock Sensor
30 TCM Signal A
31 TCM Signal B
41 O-2 Sensor Heater
43 Fuel Supply System
45 System Too Rich or Too Lean
48 Primary Heated O-2 Sensor
54 Crankshaft Speed Fluctuation Sensor
61 Primary O-2 Sensor Circuit
63 Secondary O-2 Sensor Circuit
65 Secondary O-2 Sensor Circuit
67 Catalyst System
70 Automatic Transaxle
71-74 Random Misfire
80 Exhaust Gas Recirculation
86 Engine Coolant Temperature Circuit
90 Evaporative Emission Control System Leak Detected
91 Fuel Tank Pressure Circuit
92 Evaporative Emission Control System Insufficient
