Honda Accord SM4 computer box (ECU)

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afdzan

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afdzan

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May 29, 2005
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hello guys....anybody know where i can get a new or used SM4 computer box? My dad's car got drown by flood n the comp box totally blown....anyone????
 

Hartge

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Hartge

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Nov 4, 2005
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i might be swapping in a new HC , perhaps i can sell you mine cheap cheap .
currently my SM4 is running on F20a SOHC , your 1 is the SOHC or DOHC version ?
 

Muhd978

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Muhd978

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May 21, 2020
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Nk tnya ek... knapa kereta sm4 bila dah tukar distributor yg recon... kereta still tak hidup.. adakah sebab computer box rosak.. sensor rosak ke... distributor dah 3 kali tukar but still tak leh hidup.. diminta pencerahan
 

Muhd978

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Muhd978

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May 21, 2020
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Nk tnya ek... knapa kereta sm4 bila dah tukar distributor yg recon... kereta still tak hidup.. adakah sebab computer box rosak.. sensor rosak ke... distributor dah 3 kali tukar but still tak leh hidup.. diminta pencerahan
 

Tom

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Tom

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Tak hidup means cannot crank or can crank but cannot start?

I'm curious, what made you suspect the distributor?
if you've already replaced it 3 times, and can crank but cannot start then the problem may not be the ignition side

Have you checked other sensors such as Airflow sensor or Crank angle sensor or basic items before suspecting ECU failure?
 

Muhd978

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Muhd978

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May 21, 2020
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Distributor 3 kali tukar but still tak hidup... saya suspect icm relay ataupon fuel pump relay... sebab pomen ckap engine pnya lampu tak menyala. Saya pon perasan... crank is working well... but plug wouldnt ignite as well..
 

Tom

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Tom

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Jul 6, 2000
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maybe you can provide more information to your problem, some people here can help

yeah, should try the relays first but your pomen should already know these
Good pomen must know the basics without guessing between ECU and distributor or if fuel pump is working
 

Muhd978

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Muhd978

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I just want to ask.. if the main relay or fuel relay are not in the good condition.. probably it cannot conduct or ignite the plug... just asking...
 

Tom

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Tom

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I just want to ask.. if the main relay or fuel relay are not in the good condition.. probably it cannot conduct or ignite the plug... just asking...
yes, they are like a switch

i'm not sure how many relays your car has, some cars have main relay, fuel pump relay and starter relay
some maybe just 1 main relay which also controls the fuel pump

you must solve the first step, if not you'll forever be guessing

- tell your pomen to test all the relays if they still work, try ketuk on the floor, it might help
- you can crank means your starter is okay, which means your main relay is working
- if you are not getting spark, but can smell fuel from exhaust then this has nothing to do with fuel pump relay
- i assume you already checked your plugs and cables since you replaced the distributor 3 times

no spark can also be caused by broken crank position sensor, a very simple sensor that lets your ecu know when to spark
did your pomen check that part?

just speaking from past experience with my old cars, your case may be different, good luck