macmilla

I have a 2001 4cyl Honda accord with Vtec engine and lately, the engine starts jerking seriously on hitting 4000rpm and does not rev further both when stationary and in motion. Please, what could be the cause?
The check engine light is not showing. I'm planning to buy a scanner and scan it myself but I decided to do a manual scan and ironically, I got nothing from the CEL but I got the following codes from D4 light.
25
4
47
I need help with these codes.
I'm wondering if my CEL is working at all.
Please I need help

speedfreek09

Check your oil

MAD_MIKE

CEL will only work if there is an engine or combined engine/trans shared problem. But if the bulb is burned out you will need to replace the CEL lamp.
Turn the Ignition switch to II(ON) the all the warning lamps should illuminate, if the CEL lamp does not, replace the lamp.
Or.
Beg/Borrow/Steal a OBDII scanner and retrieve OBDII codes this way.

D4 is for transmission and transmission related issues.

25-Second gear pressure switch. Located on top of the bell housing, engine side near the intake manifold. Check it for leaks and the wiring for damage/loose connections.

4- VSS, your speedometer may or may not be working properly. Check for damaged/loose wiring.

47- Mechanical Problem in Hydraulic system.

Look for any damage to the wiring, loose connections, corrosion, leaks. Fix those first.
Reset PCM, go for a drive and note if any of the codes come back.

Diagnostics for 47 requires a known good solenoid B and clutch lockup solenoids. Call around to Honda or local trasmission shops and see if they have the diagnostic equipment/solenoids to test the transmission correctly.

Fix 4 and 25 first. These can cause code 47 to set.

macmilla

Thanks for the information. I just want to point out that it's 4cyl with automatic transmission.
Secondly, I think the CEL is burnt cos it never comes on, no matter the situation.
I'll scan it ASAP and supply the codes to you.
Thanks.

macmilla

I made a mistake with those codes. The second code is 40, not 4.
Please what is the meaning of 40 on D4 light (4 long blinks)?

Please could you mail me a list of those blink codes (D4 and CEL) and their meanings so I can check them myself on my 2001 4cyl honda accord. Mail to lastof4brothers@gmail.com
Thanks a lot.

MAD_MIKE

Accord FAQ at the top of the page, scroll down to maintenance and find the 'check engine light code' thread.

40 is OBDI code speak for P0740, lockup control system. Usually relating to the torqu converter lockup not properly functioning.

You will need to have a good solenoid A and TC lockup solenoid pair to verify the solenoids are in fact working, and a trans pressure gauge.

Cheapest thing to do would be to inspect the wiring, verify it is not damaged, check the pressure switch, replace it if it is leaking/not functioning. Reset the PCM and go for a drive. If 40 and 47 come back you will need to bring it to a Honda transmisison specialist that knows the proper diagnostic procedures.

macmilla

Thanks a lot, you have been of immense help to me.
I checked out my instrument panel and discovered that my CEL bulb is burned. After I replaced it, the CEL remains on once the Ignition is turned on and when driving.
I repeated the manual scan and got the following from the CEL
22. vtec malfunction (this must be why my engine can not rev pass 4000rpm.
41: primary heated O2 sensor
65: secondary heated O2 sensor
70: Automatic transaxle malfunction
Please throw more light on the above codes
Adding these to the previous D4 codes, what would be your general accessment of this car? Code 70 and the other D4 codes scares me.
Will you advice me to return it for a refund? cos the seller is willing to refund.
Thanks once again

MAD_MIKE

22 = P1257, P1258, P1259 VTEC System Malfunction
Could be anything form low oil, leaking or faulty VTEC oil pressure switch, or faulty VTEC solenoid.
Would be best if you could get an OBDII scanner to narrow down the exact cause, otherwise you will have to do multiple tests to verify what the problem is.

41 = P0135 Front HO2S Heater Circuit Fault (Sensor 1)
65 = P0141 Secondary HO2S Heater Circuit Fault (Sensor 2)
I suspect a problem with the wire harness for the O2 sensors, get under there and verify the wires are not damaged/broken.


70 = generic AT has issues code. Most likely equivalant to P0700 which is 'something wrong with the AT'. More of a flag than an actual code. This is why an OBDII scanner would be good to have now.
Code 70 in OBD speak is basically, 'Hey there is something wrong with the trans'. It's kind of useless on its own.


Fix all engine related problems FIRST. All CEL code issues FIRST. Then move on to teh transmission. As it is if the engine is having issues from O2 to TPS or general engine condition, it will greatly affect how the transmission works.

macmilla

Thanks for the advice.
My cruise control does not work (same car as above). When I set it, the light on the dashboard comes on but nothing happens (The light on the main switch is also on). I checked out the hood and saw a free hose from the actuator. I think it is the vacuum hose. But I can't find where this hose is supposed to connect to.
Please where does the vacuum hose from the cruise control actuator connect to?

macmilla

I fixed my vtec solenoid, it was a connection problem. My car can now rev to 5000 on Park. I was told this normal on Park. I hope that's true.
The scan results yielded 2nd clutch pressure switch malfunction which was later discovered that it was not connected. It was reconnected and code dissappeared.
The codes I still have now are
P0325: Knock sensor malfunction
P0135: Primary heated O2 sensor
P0141: Secondary heated O2 sensor
P1751: mechanical problem in Hydraulic system
Any advice on these?
I observed that my car makes about 3 failed attempts to upshift to Gr 2 when cold but runs seamlessly when hot. Could this be due to wrong ATF fluid? And can it be remedied?