I have retrieved my trouble codes

Tiny
MPARK8790@GMAIL.COM
  • 1993 HONDA CIVIC
  • 190,000 MILES

I checked the ECU on my 93 Civic by jumping it with a paper clip.
The Code goes like this:
3 Short, 3 Short, 9 Short, 4 Long.

After this the first 3 Shorts are gone and it repeats: 3 Short, 9 Short, 4 Long.
So the difference is that the first 3 Short are eliminated.

What does the first set and the second set mean?

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Friday, October 14th, 2011 AT 9:27 PM

17 Replies

Tiny
RASMATAZ
  • MEMBER

See below

OBD I Trouble Codes

Code 0 Faulty PCM
Code 1 Oxygen Content
Code 3-5 Manifold Absolute Pressure (sensor)
Code 4 Crankshaft position sensor (CKP)
Code 6 Coolant Temperature
Code 7 Throttle Angle (TPS)
Code 8 TDC position
Code 9 No. 1 cylinder position (CYP)
Code 10 Intake Air Temperature (IAT)
Code 12 Exhaust Gas Recirculation System
Code 13 Barometric Pressure
Code 14 Idle Air Control (IAC) valve
Code 15 Ignition output signal
Code 16 Fuel Injector
Code 17 Vehicle speed sensor (VSS)
Code 19 Lock-up Control Solenoid
Code 20 Electronic load detector (ELD)
Code 21 Variable Valve Timing and Valve Lift Solenoid - VTEC solenoid check
Code 22 Variable Valve Timing and control pressure switch
Code 23 Knock Sensor
Code 30 A/T FI signal A, (Automatic transmission vehicles)
Code 41 and 48 Oxygen sensor heater
Code 43 Fuel Supply System

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Friday, October 14th, 2011 AT 9:37 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

This, in no way, answers my question.

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Friday, October 14th, 2011 AT 9:40 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

I guess you get what you pay for. Would have paid more if I was satisfied with the answer. Now I'm glad that I didn't pay more than the minimum.

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Friday, October 14th, 2011 AT 9:43 PM
Tiny
RASMATAZ
  • MEMBER

Above is for Hondas OBD1 codes and your year is 1993 its not a 95 and above that uses the OBD2

You sure you're reading it right? Sample DTC 12 its gonna be a flash and then a flash-flash=-disatisfied request for refund

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Friday, October 14th, 2011 AT 10:06 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

I understand the that shorts are equal 1 each and longs equal 10 but if there are multiple codes my understanding is that the codes are somehow mixed and I don't understand how to read them in this case.

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Friday, October 14th, 2011 AT 10:12 PM
Tiny
RASMATAZ
  • MEMBER

It will flash the no. 3X and goes to the next code if any present

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Friday, October 14th, 2011 AT 10:16 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

Okay then the code is definitely
3 Short 9 Short 4 Long
So 3, 9, 40 Right? Which code would that be on the Trouble Codes Chart?

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Friday, October 14th, 2011 AT 10:34 PM
Tiny
KHLOW2008
  • EXPERT
  • 42,052 POSTS

You have a Code 3, Map sensor fault.

Code 9, a fault with the cylinder position sensor, most probably requires the distributor to be replaced.

Code 40, is not listed in the trouble code definition table. Can you reconfirm?

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Tuesday, October 18th, 2011 AT 2:09 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

It definitely has 4 LONG blinks. What that means, I don't know. Could be code 43 - Fuel Supply System. What might that be?

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Wednesday, October 19th, 2011 AT 1:21 AM
Tiny
KHLOW2008
  • EXPERT
  • 42,052 POSTS

If the pause between the 4 long blinks and the 3 short blinks are shorter than between the 9 short blinks and 4 long blinks, it would be Code 9 and Code 43.

Code 43 is a fault with the heated O2 sensor which is only applicable for Federal specifications with D15B8 engines.

Would you be doing the diagnostics yourself?

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Wednesday, October 19th, 2011 AT 11:30 AM
Tiny
F4I_GUY
  • EXPERT
  • 3,333 POSTS

Fuel supply fault is typically the vehicle is running too rich or too lean. It may also be an oxygen sensor fault, or exhaust leak.

First I'd check your fuel pressure. It should be 33-38psi at idle, and should jump 10 psi with the vacuum line off the fuel pressure regulator.

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Tuesday, October 25th, 2011 AT 10:18 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

Ok. Thanks a lot. I appreciate it.

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Wednesday, October 26th, 2011 AT 3:13 AM
Tiny
RIVERMIKERAT
  • MEMBER

Mpark8790, have you gotten your car running right?

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Monday, January 2nd, 2012 AT 7:10 AM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

It's running, just with poor MPG.

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Monday, January 2nd, 2012 AT 4:03 PM
Tiny
RIVERMIKERAT
  • MEMBER

What have you done since the last communication? IS the idle rough or smooth? Does it smoke? Can you smell unburned fuel in the exhaust? How does it run under load?

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Monday, January 2nd, 2012 AT 7:31 PM
Tiny
MPARK8790@GMAIL.COM
  • MEMBER

Changed the O2 sensor. Idle is still rough. No smoke. Pretty sure I smell unburned fuel in the exhaust.

Thanks for taking another look at my question. I appreciate it.

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Tuesday, January 3rd, 2012 AT 5:35 AM
Tiny
RIVERMIKERAT
  • MEMBER

My pleasure. I'm going to drop a couple of suggestions in here.
EGR FUNCTION TESTING -1993 Honda Civic DX
Page 1 of 1
EGR VALVE
Tips
Tip: egr - Accord
Tech1
Ported EGR Valve
Run engine to operating temperature and allow it to idle. Attach a vacuum gauge to EGR vacuum hose. Locate EGR vacuum solenoid.
Using a jumper wire, ground signal wire from ECM to EGR vacuum solenoid. Vacuum should be present at EGR vacuum hose. On some models, engine speed may have to be increased 3000-4000
RPM.
Connect a vacuum pump to EGR valve. Start engine. Apply vacuum to EGR valve. If engine runs rough or stalls, and gauge holds vacuum, EGR valve is functioning properly.

Check the coil resistance: Primary side.6-.8 ohms. Secondary:12,800-19,200 ohms

ENGINE CONTROLS - SYSTEM/COMPONENT TESTS -1993 Honda Civic DX
Page 1 of 1
Resistance Test

Unplug sensor connector. On Accord and Prelude, sensor is located at top of engine, on left side. On Civic and Civic Del Sol, sensor is located on rear side of engine, near center. Measure resistance
between sensor terminals. Resistance should be as specified. See INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE table. If resistance is not within specification, replace sensor.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE Temperature - F ( C)
-4 (-20) 68 (20)
176 (80)
Resistance (Ohms) 15,000-18,000
1000-4000 200-400

ENGINE CONTROLS - SYSTEM/COMPONENT TESTS -1993 Honda Civic DX
Page 1 of 1
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

Voltage Test

Connect test harness between ECM and main harness. See Fig. 4
voltage between terminals D19 and D21. See Fig. 3.
If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, check wiring between sensor and ECM for continuity or shorts. If wiring is okay, replace MAP sensor.
3. Connect vacuum pump to MAP sensor. On Accord and Prelude, MAP sensor is located at top center of firewall. On Civic and Civic Del Sol, MAP sensor is located near throttle body. Apply
vacuum. If MAP sensor does not hold vacuum, replace sensor.
1.
. Turn ignition on. Measure
2.

Check these out and let me know what you find out.

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Tuesday, January 3rd, 2012 AT 5:55 AM

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