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Old 02-08-2013, 06:01 PM
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fault codes

I'm getting a po263 and a po266. And 403,404,405,500 any help thanks.
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Old 02-09-2013, 01:06 AM
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Do you have gauges to monitor engine values??

P0263: contribution/balance: cyl#1
P0266: "---------------------" :cyl#2
Check harness for chafing make sure injectors are plugged in tight,try wiggling around harness to see if there is any change.
What is the FICM output?
Fuel pressure?
Fuel filters been maintained?
Does it smooth out after it warms up?


P0403:EGR Control unit
P0404 EGR Performance range
P0405 EGR sensor low
Again look for wiring cuts-chafing egr plugged in tight.
Pull out the EGR and clean it, check o-rings for nicks-grease o-rings clean bore and reinstall.

P0500: Vehicle speed sensor
Trans actuator search/faulty/open circuit/short/low trans fluid Check harness coming down to transmission and check fluid level.

Check out charging system and batteries as well as all cables and grounds also get FICM values through all temps and speeds. If you have a scan-tool watch the desired and position of the egr valve, should be tracking along with the pcm,s disired position. That is as long as you still have one. lol

Last edited by mhatlen; 02-09-2013 at 01:12 AM.
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Old 02-09-2013, 07:23 AM
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Put in a spair egr value cleared all codes and rechecked no codes hope I fixed it.
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Old 02-09-2013, 08:01 AM
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Drive it 25/30 miles and recheck see if anything comes back.
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