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        General >> OBD Advice >> Scan for CB1 (v4max)
        
(Message started by: Pegasus on May 25^th, 2008, 9:46pm)

Title: Scan for CB1 (v4max)
Post by Pegasus on May 25^th, 2008, 9:46pm

Scanned John's Cosworth (complaining of heavy fuel consumption ;) ), got this:

Codes
P0131: oxygen sensor circuit low voltage (bank 1, sensor 1)
P1132: Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1.
Codes now cleared.

Data on the HO2S sensors seem to show appropriate switching but the graphs for the front sensors shows some slow switching.
Data shows LTFT 1+3 = -13.3%; LTFT 2+4 = -18.0% - mixture running rich (very, an error code will be generated below -25%)
TP = 17.6% - a little high but could be a result of other issues (reading from last year was 18%).
MAF correlation with RPM is 99% (near perfect).

Enhanced data also showed “No failure” for Oxygen sensor 1 for both banks 1& 2, MAF, EGR, TPS, CMK, EVAP. All other data looked ok (MAF volts= 0.611)

Possible causes:
So could be the bank 1 (drivers side) upstream sensor is dodgy. But the negative fuel trims strongly suggest the fuel regulator is broken – this can lead to slow switching and heavy fuel consumption.

More info from site here (http://www.fordscorpio.co.uk/ho2smonitor.htm).

Hopefully, Andrew (ScorpioMan) may be able to comment further.

Title: Re: Scan for CB1 (v4max)
Post by scorpio_man on May 25^th, 2008, 9:55pm

hi there

do you have the scan? can you email it to me for a look at.

cheers

andrew

Title: Re: Scan for CB1 (v4max)
Post by Pegasus on May 25^th, 2008, 10:11pm

its on its way

Title: Re: Scan for CB1 (v4max)
Post by v4-max aka Cheekyboy1 on May 25^th, 2008, 10:55pm

thanks for the scan paul car was showing 23.1 mpg on way home at average 87mph (via germany)

Title: Re: Scan for CB1 (v4max)
Post by scorpio_man on May 26^th, 2008, 6:51am

hi there

yes, ltfts are a bit high, so fpr could be on the way out.

have you checked all the usual stuff? MAF, spark plugs, a/c, brakes, etc.

next to check would be for any air leaks, but the idle seems steady enough.

check wiring to lambdas, but again they seem ok. i'd clear all codes and disconnect battery for a bit to reset the ltfts. check it again in a couple of weeks. if still as bad, then change the fpr first (again resetting everything). do a scan a couple of weeks later and see what you get.

hth

Title: Re: Scan for CB1 (v4max)
Post by Pegasus on May 26^th, 2008, 12:20pm

Thanks Andrew,

on 05/25/08 at 22:55:06, v4-max aka Cheekyboy1 wrote:

thanks for the scan paul car was showing 23.1 mpg on way home at average 87mph (via germany)

John, did you reset the trip computer for the return trip on the autobahn - would expect mpg of around 28-30 in the cossie.

If you want to go down the frpr route let me know - I've a modified method for the cossie.

Title: Re: Scan for CB1 (v4max)
Post by v4-max aka Cheekyboy1 on May 26^th, 2008, 12:31pm

hi paul, had battery disconnected to day to fit steering wheel, averaged 24.2 on way home from swanley 68mls, at average 62mph due to adverse weather conditions. :( im not really clued upon mechanics so any suggetions apreciated. have to get simmo to bring his overalls to next meeting. ::)