How to check your ECU codes:
1. move driver seat all the way forward.
2. locate the box on the floor.
3. locate the small plastic window and pop it open.
4. turn the ignition on.
5. count how many times the light blinks.
6. refer to the table below.
ECU CODES for 86-89 accord and 85-89 prelude
Ok I think we finally got this fixed now.. These are the correct codes..
00 LED FLASH(s) ECU
01 LED FLASH(s) 85-98 Accord
Oxygen Sensor "A" (Primary)
defective circuit or unplugged / defective sensor
02 LED FLASH(s) 85-89 Accord
Oxygen Sensor "B"
defective circuit or unplugged / defective sensor
03 LED FLASH(s) 85-98 Accord
MAP Sensor (Manifold Absolute Pressure)
defective circuit or unplugged / defective sensor
04 LED FLASH(s) Crank Angle
05 LED FLASH(s) 85-98 * Accord
MAP Sensor (Manifold Absolute Pressure)
mechanical problem / disconnected piping
* exc. 94-95
06 LED FLASH(s) 85-98 Accord
ECT Sensor (Engine Coolant Temperature)
defective circuit or unplugged / defective sensor
07 LED FLASH(s) 85-98 Accord
TP Sensor (Throttle Position)
defective circuit or unplugged / defective sensor
08 LED FLASH(s) 85-98 Accord
TDC Sensor (Top Dead Center)
defective circuit or unplugged / defective sensor
09* LED FLASH(s) 85-98** Accord
CYP Sensor (Cylinder)
defective circuit or unplugged / defective sensor
* not a valid code for any throttle body injection Hondas
** not a valid code for V-6 engines
10 LED FLASH(s) 85-98 Accord
IAT Sensor (Intake Air Temperature)
defective circuit or unplugged / defective sensor
12 LED FLASH(s) 85-98 Accord
EGR Lift Sensor (Exhaust Gas Recirculation)
defective circuit or unplugged / defective sensor
13 LED FLASH(s) 85-98 Accord
BARO Sensor (Atmospheric Pressure)
defective circuit or unplugged / defective sensor
14 LED FLASH(s) 88-98 Accord
IAC Valve (Idle Air Control)
defective circuit or unplugged / defective sensor
IAC VALVE HELP
15 LED FLASH(s) Ignition output signal
16 LED FLASH(s) fuel injector
17 LED FLASH(s) 88-98 Accord
VSS (Vehicle Speed Sensor)
defective circuit or unplugged / defective sensor
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