2012 Honda Accord 2.5L 4 cylinder

Gregory Owner/Technician Dominican Republic Posted   Latest   Edited  
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Driveability
2012 Honda Accord LX 2.4L (K24Z2) 5-spd (88E5) — 1HGCP2E38CA029141
P1659
Hard Code
No Accelaration Intermittant Crank No Start

Had this car apart and check just about everything and all checks out good,

codes on this PCM were as followed,

P062F, P060A, P2610, P1659, 

Came to the conclusion the PCM was bad so replaced this for another used one programmed it then the engine started the first time and ran perfectly, let it idle for a few minutes to get to operating temp then revved the engine and it cut out and stalled at 3200rpm then had a hard start, the same thing happened again on the restart, rev to 3200 cuts out and stalls Only code is the P1659 relay replaced did there P1659 Alldate test all checks out, 

This car was at the local Honda shop and they sent it out with? now I have headaches 😂 

Anyone had anything like this, I'm thinking it's the fuse box,

any help with this will be really appreciated 

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Edward Owner
Texas
Edward
 

Good Evening Not sure if you perform idle relean if so, redo Pinpoint test for code P1659 load test all 4pins…

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Brandon Manager
California
Brandon
 

Scope the ignition primary circuits I had one a few months ago with very similar symptoms and codes, it would stall under load, lose communication and crank no start after stalling. It turned out to be a failed ignition coil that was sending over 100 volts to the ECM and shutting it down.

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Helpful
Gregory Owner/Technician
Dominican Republic
Gregory
 

Brandon thanks mate you made me look out of the code box, and went ahead and was checking No.1 coil with a plug in it, I wanted to see if the spark stopped when it reached 3200 rpm and it didn't, it ran perfectly started perfectly on 3 coils, fitted the coil again would stall out and hard start. removed that same coil swapped it over with No.2 and the car runs great now my question is why? LOL…

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Frank Owner/Technician
Ontario
Frank
 

Think you've located the source of your problem

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Brandon Manager
California
Brandon
 

Secondary ignition energy leaking into the primary circuit and freaking the PCM out. My theory is drive by wire vehicles are very sensitive to throttle control faults so the ECM sees voltage issues and immediately flags a code for ETCS power supply?

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Richard Technician
New York
Richard
 

I would focus my attention on that 1659 code. Go to the relay and do your testing right there. Do you have 2 powers at the relay on 1 and 4 of the relay? Check the fuse for the relay as well. It looks like #18 of underhood fuse box.

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Gregory Owner/Technician
Dominican Republic
Gregory
   

Richard went through all that from start to finish has power on both 1 and 4 good grounds fuse is good. Tried new relay and new main relay 1. Wiring from relay to PCM all check good with both side disconnected, Brandon did you have the 1659 code, Yes, Edward tried the idle relearn, Pinpoint test for code P1659 load test all 4pins…this is my point all checks good, all goes nuts when I get to…

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Brandon Manager
California
Brandon
 

Yes, I had the P1659 as well as some other ECM internal fault codes. It would stall about 50% of the time on a snap throttle.

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Gregory Owner/Technician
Dominican Republic
Gregory
   

Branden, yes same here i put in another PCM as said above, the only code I get is the 1659

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Luis Technician
California
Luis
   

Check throttle body on live data. Visually inspect throttle plate and inside bore. Clean if necessary and test throttle blade bidirectional test with scan tool. Those years have many throttle body failures. Condition of spark plugs. Oe NGK. amazon and ebay sell counterfeit ngk spark plugs that will cause bunch of gremblins including the dtc you have

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Gregory Owner/Technician
Dominican Republic
Gregory
   

Luis, I did the TAC test and it started with .05% to 10% then back to 0.5% then 20% back to .5% then 40% then back to .5% then when it got to 80% it stopped said failed check codes and the code was the 1659. so we know the system is working but whats got me is can a TB cause this 1659

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Darren Mechanic
Wisconsin
Darren
 

What would Bernie do….. I am thinking 🤔, probably scope ignition injectors, cam and crank etc etc

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Edwin Mobile Technician
South Carolina
Edwin
 

Exactly!

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Matthew Technician
Nova Scotia
Matthew
   

Do you have any way to monitor the voltage at the relay and the PCM when the cut-out happens? This might help you understand what is happening at the cut-out event.

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Gregory Owner/Technician
Dominican Republic
Gregory
 

Matt good idea, let me see what i can try tomorrow.

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Claude Diagnostician
Australia
Claude
 

Hi Gregory it might pay to do voltage drop tests at the ignition switch side have had a few hondas common for electrical ignition switch failures power drop out worth a look in

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Benjamin Owner/Technician
Georgia
Benjamin
 

I’m curious what you found

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Gregory Owner/Technician
Dominican Republic
Gregory
 

Ben was the Coil now engine starts and runs as it should. Greg

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Thanks