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Discussion Starter · #1 ·
Can someone please tell me how to read the flash codes on my obd0 ecu. The LED is flashing _ _ ...

Is there a website that has all the different flash codes on it?

Thanks Max
 

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maximo said:
There is two long and 3 short. Sorry about the crude defitintion. Im not positive but ive been told that the ecu itself may have to be replaced.
That is code 23, doesn't sound like the ECU is at fault...

"23) Knock Sensor - Defective circuit or unplugged / Defective sensor"

1) Primary oxygen sensor- Defective circuit or unplugged/ Defective sensor
2) Oxygen sensor "B" - Defective circiut or unplugged/ Defective sensor
3) MAP (Manifold Absolute Pressure) Sensor - Defective circuit or unplugged/ Sensor
4) CKP (Crankshaft Position Sensor) - Defective circuit or unplugged/ Defective sensor
5) MAP (Manifold Absolute Pressure) sensor -Mechanical problem/ Disconnected piping
6) ECT ( Engine Coolant Temperature) Sensor- Defective circuit or unplugged/ Sensor
7) TP (Throttle Position) Sensor -Defective circuit or unplugged/ Defective sensor
8) TDC (Top Dead Centre) Sensor -Defective circuit or unplugged/ Defective sensor
9) CYP (Cylinder) - Defective circuit or unplugged/ Defective sensor
10) IAT (Intake Air Temperature)sensor- Defective circuit or unplugged/Defective sensor
12) EGR (Exhaust Gas Recirculation) -Defective circuit or unplugged/ Defective sensor
13) Atmospheric Pressure Sensor - Defective circuit or unplugged/ Defective sensor
14) IAC (Intake Air Control) Valve- Defective circuit or unplugged / Defective sensor
15) Ignition Output Signal - Missing or defective ignition output signal
16) Fuel Injector System - Defective circuit or unplugged/ Defective fuel injector
17) VSS (Vehicle Speed Sensor) - Defective circuit or unplugged/ Defective sensor
19) Automatic transmission lockup control Solenoid Valve- Defective circuit or unplugged/ Defective solenoid. A/T Only.
20) Electronic Load Detector - Defective circuit or unplugged/ Defective sensor
21) VTEC Solenoid Valve- Defective circuit or unplugged/ Defective solenoid
22) VTEC Oil Pressure Switch - Defective circuit or unplugged/ Defective switch
23) Knock Sensor - Defective circuit or unplugged / Defective sensor
30) Automatic Transmission Signal- Defective circuit or unplugged/ Defective sensor
31) Automatic Transmission Signal "B"- Defective circuit or unplugged/ Defective sensor
41) Primary Oxygen Sensor Heater- Circiut malfunction
43) Fuel Supply System - Defective or malfunctioning Fuel Supply Sytem
45) System too lean or too rich - Malfunction in the fuel monitoring systems
48) LAF (Lean Air Fuel) sensor - Defective circuit or unplugged / Defective sensor
54) CKF (Crankshaft Speed Fluctuation) sensor- Defective circuit or unplugged / Defective sensor
61) Primary Oxygen sensor circuit- High/ Low Voltage, Or slow response
63) Secondary Oxygen Sensor circuit- High/ Low Voltage, Or slow response
67) Catalyst System Efficiency Below Threshold- Malfunctioning catalyst system
70) Automatic Transmission - Malfunction with Automatic Transmission Controls
71-74) Random misfire in Cylinders 1-4- Condition present Creating Misfire
80) EGR (Exhaust Gas Recirculation) Insufficient Flow Detected
86) ECT (Engine Coolant Temperature) Circuir Range / Performance Problem
90) Evaporative Emissions Contrlo System - Leak Detected In Fuel Tank Area
91) Fuel Tank Pressure Sensor- Low Input
92) Evaporative Emission Control System Control System- Insufficient Purge Flow
 

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It could also be 20, and 3... 8)

Max: Is your VTEC still working?

I doubt the ECU will need to be replaced though... If the LED was on solid or not at all (like when it flashes once when you start the car), then you may have an issue :p
 

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Discussion Starter · #6 ·
Yes my vtec is still working. Im postive that the code is 23 due to the length of pause between codes. Will this cause my car to have a difficult time starting? Once it starts i can turn it of and on no problem at all but not after its been sitting. I always have to charge the battery because the starter drains it before it will fire up.

Thanks Max

ps
what would optimal fuel pressure be?
 

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If it was code 23 (Knock Sensor), the ECU would not allow VTEC to engage. Time to look elsewhere... like 20 and 3 ;)

And a faulty map sensor could cause a car to not start easily. Knock sensor has nothing to do with starting, so wouldn't cause anything like that. Fix the map, first, clear the codes, and then see if the ELD code comes back.
 

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I'm just throwing this out there. Last year I had the exact problem (code 23) and I checked my base timing and was waaay advanced. After I reset the timing, problem went away. I would usually trip a CEL for the knock just after a hot restart or off idle transition. It wouldn't always set the code even though I had the CEL.
 

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before you replace anything i would suggest you get under the car to make sure the knock sensor is unplugged in

if it is, ohm the wire from the knock sensor to the ecu to make sure there are no breaks

what grade of gas are you using? low grade/octane will cause it to knock/detonate

check timing as stated above

hard starting, take your car to the local shop and have them do a load test on your battery, maybe your battery needs replacing
 
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