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Smart Forfour 2005 [454] - Intermittent loss of power (waveform) #

Posted by Mark Robins on August 12, 2010, 11:33 am

Year of Manufacture *: 2005
Engine Size and Code *: (134.910 - Eng_454
( Optional ) Scanner Used: Autocom ADP 186
( Optional) Fault Codes: P1966 P0122 P1961 P0223 P1962 P1963

P1966 - Plausibility check of actual values for intake manifold pressure sensor
- Intermittent

P0122 - Throttle position sensor 1; voltage too low
- Intermittent

P1961 - Plausibility check of values for intake manifold pressure sensor and throttle
valve actuator. Potentiometer (1)
- Intermittent

P0223 - Throttle position sensor 2; voltage too high
- Intermittent

P1962 - Plausibility check of values for intake manifold pressure sensor and throttle
valve actuator. Potentiometer (2)
- Intermittent

P1963 - Plausibility check of values for intake manifold pressure sensor and throttle
valve actuator
- Intermittent

Relevant codes logged after erase are P1962 & P0223
Vehicle has intermittent loss of power, I've scopped the two tracks at the throttle body (as in image) and they are mirror images of each other and output of MAP sensor and can find no problem.
Do these have an issue with the throttle body as I'm reluctant to change any parts with out positively being able to see a fault? Does anybody know if the throttle body are coded or need adaption if it comes to that?

Thanks in advance for any info.

Mark

Re: Smart Forfour 2005 [454] - Intermittent loss of power (waveform) #

Posted by Kevin Gregory on August 21, 2010, 5:06 pm, in reply to "Smart Forfour 2005 [454] - Intermittent loss of power (waveform) #"
Message modified by board administrator August 26, 2010, 1:04 pm

was the fault present when u took these readings need to road test it to see if fault occurs.put another scope channel on map sensor .

Re: Smart Forfour 2005 [454] - Intermittent loss of power (waveform) #

Posted by Mark Robins <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1448' width='330' height='300' border=0 style='border:none;'> on August 27, 2010, 8:54 am, in reply to "Re: Smart Forfour 2005 [454] - Intermittent loss of power (waveform) #"

Thanks for the reply Kevin, I've just had the car back in with a live fault, there is no throttle response what so ever, APP input on live data is OK. I scoped the throttle body position sensors and by manually opening and closing the butterfly with my finger I had a good output, but the pwm signal is non existent with the live fault, when the system recovers the PWM signal is there. I'm starting to think an ECU problem but I have no wiring diagrams so I'll have to reverse engineer the problem and see if we have a connection or water ingress issue.
P.S. Map sensor checked OK with live fault>

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