95 EX Vtec. Code 4 Please Help
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95 EX Vtec. Code 4 Please Help - 4/27/2008 12:43:57 AM
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twinturboyan
Posts: 10
Joined: 4/26/2008
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Can some one please help me figure out why my engine is shaking @ idle. The CEL is on. Ran the code and it flashed 4 times kinda fast. Code 4 is Crankshaft Position Sensor CKP Check sensor and circuit. I did the resistance test on the plug and it was within limits @ 851 ohmns. I do not know the history of the car because I just baught it with this problem. It is definatly a timing issue. I took the distributor of the car and noticed that is was a remanufactured unit. Maybe it is defective. What do you guys think?
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95 Accord, Auto, 4 cyl. vtec,
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RE: 95 EX Vtec. Code 4 Please Help - 4/27/2008 4:46:15 AM
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TexasHonda
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Are you sure you checked the correct wires? There are three sensors; CYP, CKP, and TDC in the distributor. None of the sensors are replaceable parts. It would be good to know that all sensors are in acceptable range 700-1300 ohms. Make sure your VOM is working correctly. Resistance measurements are easy to get wrong.
Check engine side harness for signs of wire damage that could cause this fault. It's a hassle to disconnect the ECU mating connector and check the wiring, but that is only way to be sure.
If everything checks OK, the distributor itself may be faulty (too large sensor/magnet clearance, worn bearing/bushing). I once damaged my sensor mounting by forcing the distributor into place w/ distributor key off by 180 degs. I was able to open and repair the damage to correct the problem. You might want to open the distributor and look for any obvious faults. In my case there was a bent frame inside the distributor.
Otherwise a replacement part from either a salvage yard or aftermarket is required. I've had good luck w/ used parts found through car-part.com using the search feature to find parts near my zip code.
good luck
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1994 Accord EX
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RE: 95 EX Vtec. Code 4 Please Help - 4/27/2008 9:26:01 AM
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twinturboyan
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I will open the distributor tonight. Also I will check the harness. When I put the distributor back n do i have to use a timing light to check timing or just put it back in the same position? I do not think this a major problem.
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95 Accord, Auto, 4 cyl. vtec,
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RE: 95 EX Vtec. Code 4 Please Help - 4/27/2008 1:10:21 PM
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TexasHonda
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I usually just mark the mounting bracket and distributor and align the marks to previous position. ECU gets timing information from distributor sensors and likely sets timing to required value regardless of static distributor position, w/i reason.
Note, the key on the distributor must be oriented to fit the camshaft keyway. One side of key is slightly thicker than other side to provide a "foolproof" key. It's not foolproof, as I can attest. Look carefully, and if distributor does not seem to fit, you're probably off by 180.
Also, it is possible to install the distributor drive key on the distributor shaft off by 180 degrees. Guess how I know this? Just take your time and I don't think you'll have problems. Not that many parts in the distributor. Some of phillips-head mounting screws were extremely tight. I had to use a sharp chisel to loosen them w/ sideways blows.
good luck
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1994 Accord EX
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RE: 95 EX Vtec. Code 4 Please Help - 4/27/2008 6:11:38 PM
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hondadude
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To Add to the above suggestions, always check that the spark shield is under the rotor.
Many times people throw them away, but stray spark voltage can cause codes like yours
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85 Yota pickup 235k miles "never say die" 22r engine.
92 Acura Legend 70k miles. Wife lets me drive it for oil changes.
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RE: 95 EX Vtec. Code 4 Please Help - 5/11/2008 8:58:28 PM
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twinturboyan
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I changed the distributor since the ckp sensor is inside. The problem still persist. Trouble code # 4 and engine shaking @ idle. Does anyone think the crank shaft might be of timing causing the sensor to read the correct problem?
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RE: 95 EX Vtec. Code 4 Please Help - 5/11/2008 9:32:29 PM
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JimBlake
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New distributor & the problem is still there, so it must have been in the wiring all along.
There isn't any sensor on the crankshaft itself, so the ECU has no way of knowing if the crank/cam is in proper time.
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'03 Accord & '07 Civic
'01 Saab 9³ & '05 9²x
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RE: 95 EX Vtec. Code 4 Please Help - 5/12/2008 11:17:11 AM
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twinturboyan
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I will try that tommorow morning. But i was told by the previous owner that it is a timing issue and that is all he knows. I will let you know what happens when i turn that screw. Thanks
Yan
aka
Mr Open NE Lock
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95 Accord, Auto, 4 cyl. vtec,
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RE: 95 EX Vtec. Code 4 Please Help - 5/12/2008 5:03:07 PM
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TexasHonda
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Code 4 can't be fixed by adjusting idle speed. As JimBlake suggested, the wiring from distributor connector to ECU must be checked for a fault. Check sensor resistance at the ECU connector. If you get a short or open, the wiring or the connector at the distributor could be the problem.
If resistance checks OK, this would suggest the ECU connector as the only possible source of the fault.
good luck
good luck
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1994 Accord EX
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RE: 95 EX Vtec. Code 4 Please Help - 5/12/2008 5:35:03 PM
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WheelBrokerAng
Posts: 7079
Joined: 8/30/2004
From: Canton/Massillon, Ohio 44646
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quote:
ORIGINAL: TexasHonda
Code 4 can't be fixed by adjusting idle speed. As JimBlake suggested, the wiring from distributor connector to ECU must be checked for a fault. Check sensor resistance at the ECU connector. If you get a short or open, the wiring or the connector at the distributor could be the problem.
If resistance checks OK, this would suggest the ECU connector as the only possible source of the fault.
good luck
good luck
JimBlake and TexasHonda got your answer down pat...
WheelBrokerAng 
|Go |CAV's
Thumbnail Image
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< Message edited by WheelBrokerAng -- 5/12/2008 5:36:11 PM >
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RE: 95 EX Vtec. Code 4 Please Help - 5/12/2008 8:32:21 PM
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JimBlake
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As you're checking, look at the plugs. I've heard where the pins of the connectors can either get bent or pushed back so they don't make good contact when plugged together.
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'01 Saab 9³ & '05 9²x
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RE: 95 EX Vtec. Code 4 Please Help - 6/19/2008 4:16:52 PM
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twinturboyan
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Ok guys since I wrote last time I found out that this engine had a cracked # 1 Cyl. So I have changed the engine that came with a distributor, intake head, and block all togther from a salvage yard. It has 100k on it. I started the car thinking that all plroblems with the check engine light will be gone. But NO WAY. The CEL is still on and starts shaking after 3200 RPM ( code #4). It runs great @ idle. So this leads me to conclude that the only possible cause is the wiring to the distributor just like TaxasHonda suggested. I am going to be checking that tommorow. Does anyone know if the wire is bad do you have to change the whole engine wire harness or can you just change that one? Any help would be appreciated. Has anyone ever exprienced this kind of problem?
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95 Accord, Auto, 4 cyl. vtec,
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RE: 95 EX Vtec. Code 4 Please Help - 6/19/2008 4:49:01 PM
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PAhonda
Posts: 1348
Joined: 9/22/2006
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You can replace the bad wire.
TexasHonda and Jim Blake are correct with checking the resistance through the wires. At the distributor you check the resistance between 2 (blu/grn) and 6(blu/yel) on connector C124.
Plug C124 back in and unpug the 14 wire connector near the engine bay fuse box (there are two large connectors there, so find your wire colors) and measure the resitance on those two wire colors at the connector going to the distributor. Finally measure the resistance between pin B15 and B16 at the ECU.
All the resistance readings should be the same. If you find a change, you will have isolated the wiring problem. Also make sure the pins and connectors are clean, pins are straight, and make sure they are making good contact.
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1995 Accord EX MT
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RE: 95 EX Vtec. Code 4 Please Help - 6/19/2008 5:19:01 PM
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TexasHonda
Posts: 1507
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If you''ve verified the resistance at 700-1300 ohms at the distributor connector, step backwards as JimBlake suggests. Somewhere there''s a wire fault or pin fault.
It may be tricky to find if its a wire fault. It may be easier to just bypass the entire wire by splicing a new wire near each connector.
regards
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1994 Accord EX
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